Above Market Leases [Member] Above Market Leases Significant Accounting Policies Accounts and Notes Receivable, Net Tenant receivables and accrued revenue, net Receivable Type [Axis] Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] Accumulated derivative losses, net Accumulated Net Unrealized Investment Gain (Loss) [Member] Net unrealized gains on marketable securities Net unrealized gains (losses) recorded in accumulated other comprehensive income (loss) Net unrealized gains on marketable securities, net Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Gross accumulated other comprehensive income or loss related to derivative activities Accumulated derivative losses, net Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax Currency translation adjustments Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax Accumulated Other Comprehensive Income (Loss) [Line Items] Significant Accounting Policies Accumulated Other Comprehensive Income (Loss), Net of Tax Beginning balance Ending balance Accumulated losses recorded in AOCI Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Translation Adjustment [Member] Currency translation adjustments Currency translation and net investment hedges Premium received on preferred stock issued Additional Paid in Capital, Preferred Stock Amortization, included in statements of operations and comprehensive income Amortization [Abstract] Adjustments to reconcile consolidated net income to net cash provided by operating activities - Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Compensation expense Allocated Share-based Compensation Expense Amortization expense Allowance for Credit Losses on Financing Receivables [Table Text Block] Schedule of activity in the allowance for credit losses including the activity related to discontinued operations Accounts written off, net of recoveries Allowance for Loan and Lease Losses, Adjustments, Net Allowance for Loan and Lease Losses [Roll Forward] Allowance for Credit Losses Amortization of Debt Discount (Premium) Amortization of debt premiums, net of discounts Amortization of deferred leasing costs Amortization of Deferred Leasing Fees Amortization of deferred financing costs Amortization of Financing Costs Amortization of Intangible Assets Amount of amortization expenses Area of Real Estate Property Area of land acquired (in acre) in Oyster Bay, New York Area of property acquired (in acre or square feet) Assets Total assets Assets [Abstract] ASSETS: Aggregate carrying value of consolidated properties disposed of Total assets of discontinued operations Total assets Assets of Disposal Group, Including Discontinued Operation Marketable securities of our captive insurance companies Available-for-sale Securities, Debt Securities Available-for-sale Securities, Equity Securities Market value of investments Available-for-sale Securities [Member] Available for sale securities Award Type [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Thereafter Below Market Lease, Amortization Income, after Year Five 2014 Below Market Lease, Amortization Income, Next Twelve Months 2018 Below Market Lease, Amortization Income, Year Five 2017 Below Market Lease, Amortization Income, Year Four 2016 Below Market Lease, Amortization Income, Year Three 2015 Below Market Lease, Amortization Income, Year Two Unamortized below market leases included in accounts payable, accrued expenses, intangibles and deferred revenues Below Market Lease, Gross Lease intangibles assets, net Below Market Lease, Net Estimated future amortization, and the increasing (decreasing) effect on below market minimum rents Below Market Lease, Net, Amortization Income, Fiscal Year Maturity [Abstract] Building and Building Improvements [Member] Buildings and improvements Business Acquisition, Acquiree [Domain] Business Acquisition [Axis] Business Acquisition, Cost of Acquired Entity, Purchase Price (Deprecated 2013-01-31) Number of units issued in connection with acquisition of the remaining interest in Arizona Mills Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Acquisitions Business Acquisition [Line Items] Business Acquisition, Percentage of Voting Interests Acquired Ownership interests acquired (as a percent) Consideration paid Purchase price of business acquired Consideration transferred for partner's interests acquired Business Combination, Consideration Transferred Amount of limited partner units issued Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Total assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Cash and cash equivalents Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents Other liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other Investment properties allocation of lease related intangibles Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Total liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Mortgage liability Excess investment in acquisition of joint venture Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Mortgage indebtedness assumed Investment properties allocation of mortgage debt including debt premiums Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt Mortgage debt assumed, consolidated Mortgage debt including debt premiums Transaction value Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest Purchase Accounting Allocation Business Combinations and Other Purchase of Business Transactions, Policy [Policy Text Block] Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage Ownership interest after acquisition (as a percent) Initial Investment Percentage of Business Acquired Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain (Loss), Net Gain due to acquisition of controlling interest Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents CASH AND CASH EQUIVALENTS, beginning of period CASH AND CASH EQUIVALENTS, end of period Cash and Cash Equivalents, at Carrying Value, Including Discontinued Operations Cash and Cash Equivalents, Period Increase (Decrease) DECREASE IN CASH AND CASH EQUIVALENTS (NOTE 3) Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents Class of Stock [Domain] Equity Class of Stock [Line Items] Commitments and Contingencies. Commitments and contingencies Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Common stock reserved for possible conversion (in shares) Common Stock, Capital Shares Reserved for Future Issuance Dividends declared per common share (in dollars per share) Common Stock, Dividends, Per Share, Declared Common Stock, Par or Stated Value Per Share Shares of common stock issued in a public offering, price (in dollars per share) Common Stock, Shares, Issued Shares of common stock issued in a public offering Common stock, shares issued Common Stock, Shares, Outstanding Shares of common stock Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive income attributable to unitholders Comprehensive (Income) Loss, Net of Tax, Attributable to Noncontrolling Interest Comprehensive income attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive income Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Axis] Concentration Risk Type [Axis] Concentration of Credit Risk Concentration Risk [Line Items] Percentage of consolidated revenues from a single customer or tenant Concentration Risk, Percentage Concentration Risk [Table] Concentration Risk Type [Domain] Consolidated properties Consolidated Properties [Member] Consolidated property interests Corporate Debt Securities [Member] Senior unsecured notes Investment in Unconsolidated Entities Cost and Equity Method Investments Disclosure [Text Block] Value of non-marketable security accounted for under the cost method Carrying value of investments under the cost method Cost Method Investments Cost method investment Other-than-temporary non-cash charges Cost-method Investments, Other than Temporary Impairment Cost of Property Repairs and Maintenance Repairs and maintenance Total operating expenses Costs and Expenses Costs and Expenses [Abstract] EXPENSES: Currency [Axis] Concentration of credit risk Customer Concentration Risk [Member] Debt and Capital Lease Obligations Mortgages and unsecured indebtedness Total Mortgages and Other Indebtedness Total mortgages and other indebtedness Mortgages Debt Debt Disclosure [Text Block] Debt Debt Instrument [Axis] Interest added to reference rate (as a percent) Debt Instrument, Basis Spread on Variable Rate Total principal maturities Long-term Debt, Gross Debt Instrument, Description of Variable Rate Basis Reference rate Debt issued Debt Instrument, Face Amount Debt issued to refinance previous mortgage Debt Instrument, Interest Rate During Period Average interest rate (as a percent) Debt Instrument, Interest Rate, Stated Percentage Interest rate on debt (as a percent) Fixed interest rate (as a percent) Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum Interest rate, high end of range (as a percent) Interest rate, low end of range (as a percent) Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum Debt Instrument [Line Items] Debt Debt Instrument, Name [Domain] Amount of debt redeemed Mortgage indebtedness repaid Debt Instrument, Repurchased Face Amount Schedule of Long-term Debt Instruments [Table] Debt Instrument, Unamortized Discount Net discount Net unamortized debt premiums and discounts Debt Instrument, Unamortized Discount (Premium), Net Net unamortized debt premiums Net premiums Debt Instrument, Unamortized Premium Weighted average interest rate (as a percent) Debt, Weighted Average Interest Rate Deferred Financing and Lease Costs Deferred Charges, Policy [Policy Text Block] Deferred costs and other assets Deferred Costs and Other Assets Deferred costs and other assets Deferred tax assets related to TRS subsidiaries, net Deferred Tax Assets, Net of Valuation Allowance Deferred Tax Assets, Net [Abstract] Income Taxes Valuation allowance Deferred Tax Assets, Valuation Allowance Depreciation, Depletion and Amortization, Nonproduction Depreciation and amortization Fixed rate swap agreements, weighted average fixed pay rate (as a percent) Derivative, Average Fixed Interest Rate Fixed rate swap agreements, weighted average variable receive rate (as a percent) Derivative, Average Variable Interest Rate Derivative, by Nature [Axis] Derivative Contract [Domain] Derivative Asset, Fair Value, Gross Asset Interest rate swap agreements and foreign currency forward contracts, gross asset balance Derivative Liability, Fair Value, Gross Liability Interest rate swap agreements and foreign currency forward contracts, gross liability balance Derivative Instrument [Axis] Derivative financial instruments Derivative [Line Items] Derivative, Name [Domain] Derivatives, Policy [Policy Text Block] Derivative Financial Instruments Derivative [Table] Development in Process Construction in progress included above Securities with dilutive effect Dilutive Securities, Effect on Basic Earnings Per Share Effect of dilutive securities: Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] Direct Costs of Leased and Rented Property or Equipment Property operating Director [Member] Non-employee Directors Automatic Awards for Eligible Directors Additional disclosures Discontinued Operation, Additional Disclosures [Abstract] Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax Gain on disposal of discontinued operations, net OPERATING INCOME Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax Discontinued Operations Discontinued Operation, Income (Loss) from Discontinued Operation Disclosures [Abstract] Discontinued operations CONSOLIDATED NET INCOME Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax Discontinued Operations Discontinued Operations, Policy [Policy Text Block] Income and other taxes Discontinued Operation, Tax Effect of Discontinued Operation Tenant receivables and accrued revenue, net Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net Assets and liabilities transferred Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract] Cash and cash equivalents Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents Depreciation and amortization Disposal Group, Including Discontinued Operation, Depreciation and Amortization Interest expense Disposal Group, Including Discontinued Operation, Interest Expense Total operating expenses Disposal Group, Including Discontinued Operation, Operating Expense Other Disposal Group, Including Discontinued Operation, Other Expense Other liabilities Disposal Group, Including Discontinued Operation, Other Liabilities TOTAL REVENUE Disposal Group, Including Discontinued Operation, Revenue Summarized financial information for discontinued operations Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] Disposal Groups, Including Discontinued Operations, Name [Domain] Total distributions paid per unit (in dollar per share) Distribution Made to Limited Partner, Distributions Paid, Per Unit Dividends, Preferred Stock Preferred unit requirements Per Unit Data Earnings Per Share, Basic Net income attributable to unitholders (in dollars per unit) Net income (loss) per unit - Basic Net income attributable to unitholders (in dollars per unit) Earnings Per Share, Basic [Abstract] BASIC EARNINGS PER UNIT Earnings Per Share, Diluted Net income attributable to unitholders (in dollars per unit) Net income attributable to unitholders (in dollars per unit) Earnings Per Share, Diluted [Abstract] DILUTED EARNINGS PER UNIT Earnings Per Share [Text Block] Per Unit Data Employee Options Employee Stock Option [Member] Equity Component [Domain] Investment, Name [Domain] Equity Method Investment, Difference Between Carrying Amount and Underlying Equity Add: Excess Investment Distribution from joint venture financing proceeds Proceeds from Equity Method Investment, Dividends or Distributions Distributions of income from unconsolidated entities Aggregate cash received Equity Method Investment, Net Sales Proceeds Equity Method Investment, Other than Temporary Impairment Other than temporary impairment charge Impairment charge from investments in unconsolidated entities Interest in income-producing properties, under joint venture arrangements (as a percent) Equity Method Investment, Ownership Percentage Ownership interest (as a percent) Joint venture ownership percentage Gain due to formation of joint venture Equity Method Investment, Realized Gain (Loss) on Disposal Gain on sale of equity method investment Equity Method Investments Investment in unconsolidated entities, at equity Equity investment Our net Investment in unconsolidated entities, at equity Investment in Unconsolidated Entities Equity Method Investments Equity Method Investments [Member] Equity Method Investment, Summarized Financial Information, Assets Total assets Total assets Equity Method Investment, Summarized Financial Information, Assets [Abstract] Assets: Total operating income Equity Method Investment, Summarized Financial Information, Income (Loss) from Continuing Operations before Extraordinary Items Income from Continuing Operations Equity Method Investment, Summarized Financial Information, Income Statement [Abstract] STATEMENTS OF OPERATIONS Total liabilities Equity Method Investment, Summarized Financial Information, Liabilities Equity Method Investment, Summarized Financial Information, Liabilities and Equity [Abstract] Liabilities and Partners' Deficit: Equity Method Investment, Summarized Financial Information, Noncontrolling Interest Noncontrolling interests Equity Method Investment, Summarized Financial Information, Net Income (Loss) Consolidated net income (loss) of Klepierre Consolidated net Income Net Income Total revenues Equity Method Investment, Summarized Financial Information, Revenue Equity Method Investment, Underlying Equity in Net Assets Partners' deficit Europe Europe [Member] Extinguishment of construction loans Extinguishment of Debt, Amount Extinguishment of Debt, Gain (Loss), Net of Tax Loss on debt extinguishment Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value Measurement Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Hierarchy [Axis] Measurement Frequency [Axis] Weighted average discount rates assumed in calculation of fair value for fixed-rate mortgages (as a percent) Fair Value Inputs, Discount Rate Fair Value, Inputs, Level 1 [Member] Level 1 Fair Value, Inputs, Level 2 [Member] Level 2 Fair Value, Inputs, Level 3 [Member] Level 3 Fair Value, Measurement Frequency [Domain] Fair Value Hierarchy [Domain] Fair Value, Measurements, Recurring [Member] Recurring Fair Value of Financial Instruments, Policy [Policy Text Block] Fair Value Measurements Financial Guarantee [Member] Joint Venture Mortgage and Indebtedness Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Finite-Lived Intangible Assets by Major Class [Axis] Lease intangibles assets, gross Finite-Lived Intangible Assets, Gross Intangible Assets Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets, Major Class Name [Domain] Lease intangibles assets, net Finite-Lived Intangible Assets, Net Weighted average remaining life of intangible Finite-Lived Intangible Assets, Remaining Amortization Period Amortization period, maximum Finite-Lived Intangible Asset, Useful Life Average life of in-place lease intangibles Fixtures and Equipment, Gross Furniture, fixtures and equipment Foreign Currency Derivatives at Fair Value, Net Forward contract net, fair value Currency forward contracts Forward Contracts [Member] Gain (Loss) on Disposition of Assets Gain (loss) on disposition Gain (Loss) on Disposition of Real Estate, Discontinued Operations Gain (loss) on disposition from discontinued operations Gain (Loss) on Investments Marketable and non-marketable securities charges and realized gains, net Gain recognized on sale of investment Gain (Loss) on Investments, Excluding Other than Temporary Impairments Gain upon acquisition of controlling interests and sale or disposal of assets and interests in unconsolidated entities, net Gain (Loss) on Sale of Properties Extinguishment charge Gains (Losses) on Extinguishment of Debt Loss on extinguishment of debt General and Administrative Expense General and administrative Simon (Managing General Partner) General Partner [Member] General Partners' Capital Account General Partner, 310,765,326 and 310,608,565 units outstanding, respectively General Partners' Capital Account, Units Outstanding General Partner, units outstanding Goodwill Goodwill Intangibles Goodwill and Intangible Assets, Policy [Policy Text Block] Guarantor Obligations, Nature [Axis] Guarantor Obligations [Line Items] Guarantees of Joint Venture Indebtedness: Guarantor Obligations, Maximum Exposure, Undiscounted Loan guarantee Guarantor Obligations, Nature [Domain] Held-to-maturity Securities [Member] Held-to-maturity securities Held-to-maturity Securities, Restricted Investments used to fund debt service requirements Income (Loss) from Continuing Operations Attributable to Parent Income from Continuing Operations Consolidated income from continuing operations Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest Income from continuing operations (in dollars per unit) Income (Loss) from Continuing Operations, Per Basic Share Income from continuing operations (in dollars per unit) Income (Loss) from Continuing Operations, Per Diluted Share Net income attributable to noncontrolling interests Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Noncontrolling Interest Loss from operations of discontinued joint venture interests Income from operations of discontinued joint venture interests Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent NET INCOME ATTRIBUTABLE TO UNITHOLDERS Discontinued operations (in dollars per unit) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Discontinued operations (in dollars per unit) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Income (Loss) from Equity Method Investments Income from unconsolidated entities Share of net income, net of amortization of our excess investment Income from Unconsolidated Entities Consolidated Statements of Operations and Comprehensive Income Disposal Group Name [Axis] Sale of Properties Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Discontinued Operations Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Table] Income and other taxes Income Tax Expense (Benefit) Income Taxes Income Tax, Policy [Policy Text Block] Increase (Decrease) in Accounts and Notes Receivable Tenant receivables and accrued revenue, net Changes in assets and liabilities - Increase (Decrease) in Operating Capital [Abstract] Increase (Decrease) in Prepaid Expense and Other Assets Deferred costs and other assets Increase (Decrease) in Stockholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (decrease) in equity Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Effect of stock options of Simon Property (in shares) Interest Costs Capitalized Capitalized interest Interest Expense Interest expense Interest income from TMLP and SPG-FCM, net of inter-entity eliminations Interest Income, Related Party Cash paid for interest Interest Paid, Net Interest Rate Cap [Member] Interest rate cap Amount expected to be reclassified from accumulated other comprehensive loss to earnings within the next year Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net Interest Rate Derivative Liabilities, at Fair Value Interest Rate Derivatives, at Fair Value, Net Interest rate net, fair value Interest Rate Swap [Member] Interest rate swap Investment Building and Building Improvements Buildings and improvements Investment Holdings [Line Items] Marketable and Non-Marketable Securities Investment Holdings [Table] Investment Owned, Balance, Shares Number of shares owned Shares owned Excess investment Investment Owned, Unrecognized Unrealized Appreciation Investment, Policy [Policy Text Block] Marketable and Non-Marketable Securities Investments by Secondary Categorization [Domain] Investment Secondary Categorization [Axis] Investments, Fair Value Disclosure Investments Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Investment in Klepierre, at equity Estimated fair value of newly consolidated properties Investments in Affiliates, Subsidiaries, Associates, and Joint Ventures, Fair Value Disclosure Investment Type [Axis] Investments [Domain] Land Land Ground lease expense Operating Leases, Rent Expense Lease expense Rentals under Operating Leases Above and below market leases Leases, Acquired-in-Place, Market Adjustment [Member] In-place lease intangibles Leases, Acquired-in-Place [Member] Lease Commitments Leases, Operating [Abstract] Credit Facility Letter of Credit [Member] Letters of Credit Outstanding, Amount Letters of credit outstanding Liabilities Total liabilities Liabilities [Abstract] LIABILITIES: Liabilities and Equity Total liabilities and equity Total liabilities of discontinued operations Liabilities of Disposal Group, Including Discontinued Operation Total liabilities Limited Partners Limited Partner [Member] Limited Partners' Capital Account Limited Partners, 52,940,965 and 51,846,157 units outstanding, respectively Units issued to limited partners, units Limited Partners' Capital Account, Units Issued Limited Partners' Capital Account, Units Outstanding Limited Partners, units outstanding Line of Credit Facility, Amount Outstanding Credit facility, amount outstanding Line of Credit Facility, Average Outstanding Amount Credit facility, weighted average amount outstanding Line of Credit Facility, Maximum Amount Outstanding During Period Maximum amount outstanding during period Line of Credit Facility, Maximum Borrowing Capacity Maximum borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Available borrowing capacity Line of Credit [Member] Credit Facility Balance, beginning of period Balance, end of period Loans and Leases Receivable, Allowance Loans to related party Loans and Leases Receivable, Related Parties Debt Maturity and Other Long-term Debt, Fiscal Year Maturity [Abstract] Thereafter Long-term Debt, Maturities, Repayments of Principal after Year Five 2014 Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 2018 Long-term Debt, Maturities, Repayments of Principal in Year Five 2017 Long-term Debt, Maturities, Repayments of Principal in Year Four 2016 Long-term Debt, Maturities, Repayments of Principal in Year Three 2015 Long-term Debt, Maturities, Repayments of Principal in Year Two Long-term Debt, Percentage Bearing Fixed Interest, Amount Fixed-rate mortgages and other indebtedness Weighted-average interest rate, fixed-rate debt (as a percent) Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate Variable-rate mortgages and other indebtedness Long-term Debt, Percentage Bearing Variable Interest, Amount Weighted average interest rate, variable-rate debt (as a percent) Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Major Property Class [Axis] Major Property Class [Domain] Marketable Securities Marketable securities with Level 1 fair value inputs Marketable Securities, Unrealized Gain (Loss) Aggregate unrealized gain (loss) on available-for-sale investments, net Marketing and Advertising Expense Advertising and promotion Maximum [Member] Maximum Minimum [Member] Minimum Stockholders' Equity Attributable to Noncontrolling Interest Nonredeemable noncontrolling deficit interests in properties, net Total noncontrolling interests reflected in equity Nonredeemable noncontrolling (deficit) interests in properties, net Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Distributions to noncontrolling nonredeemable interestholders Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Purchase of noncontrolling interests Limited partners' interests in the Operating Partnership Noncontrolling Interest in Operating Partnerships Noncontrolling Interest, Ownership Percentage by Parent Ownership percentage in the Operating Partnership Mortgage Loans on Real Estate, Carrying Amount of Mortgages Aggregate carrying values of mortgages and mezzanine loans Loans held for investment Real Estate, Type of Property [Axis] Aggregate face amount of mortgage notes Mortgage Loans on Real Estate, Face Amount of Mortgages Mortgage Loans on Real Estate, Interest Rate Interest rate on mortgage loan (as a percent) Real Estate [Domain] Mortgage Loans on Real Estate, Number of Loans Number of mortgage and mezzanine loans Number of non-recourse mortgage notes under which the Company and subsidiaries are borrowers Mortgages [Member] Mortgages Nature of Operations [Text Block] Organization Net Cash Provided by (Used in) Financing Activities Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] CASH FLOWS FROM FINANCING ACTIVITIES: Net Cash Provided by (Used in) Investing Activities Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] CASH FLOWS FROM INVESTING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES: Net Income (Loss) Attributable to Parent Net Income Net Income Net Income (Loss) Allocated to General Partners General Partner Net Income (Loss) Allocated to Limited Partners Limited Partners Net Income (Loss) Attributable to Noncontrolling Interest Net income attributable to noncontrolling interests Net income attributable to noncontrolling interests Net income, attributable to noncontrolling redeemable interests in properties in temporary equity (in dollars) Net Income (Loss) Attributable to Redeemable Noncontrolling Interest Net Income (Loss) Available to Common Stockholders, Basic NET INCOME ATTRIBUTABLE TO UNITHOLDERS Net Income attributable to Unitholders - Basic Net income attributable to unitholders Net Income (Loss) Available to Common Stockholders, Diluted Net Income attributable to Unitholders - Diluted New Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Noncontrolling Interests Noncontrolling Interest [Member] Noncontrolling interests Notes Receivable, Related Parties Notes receivable from related party Loan receivable from SPG-FCM Debt extinguished, noncash Notes Reduction Number of Countries in which Entity Operates Number of countries Number of Interest Rate Derivatives Held Number of outstanding interest rate derivatives Properties subject to ground leases Number of Properties Subject to Ground Leases Number of income producing properties Number of Real Estate Properties Number of properties secured by non-recourse mortgage notes Number of unconsolidated properties in the spin-off of Washington Prime Number of properties included in consolidation Number of reportable segments Number of Reportable Segments Number of States in which Entity Operates Number of U.S. states containing property locations Office Office Building [Member] Operating Income (Loss) OPERATING INCOME Operating Income Operating income Total Operating Leases, Future Minimum Payments Due Future minimum lease payments due under ground leases Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] 2014 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2018 Operating Leases, Future Minimum Payments, Due in Five Years 2017 Operating Leases, Future Minimum Payments, Due in Four Years 2016 Operating Leases, Future Minimum Payments, Due in Three Years 2015 Operating Leases, Future Minimum Payments, Due in Two Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Future minimum rental receivables Operating Leases, Future Minimum Payments Receivable Future minimum rentals to be received under noncancelable tenant operating leases Operating Leases, Future Minimum Payments Receivable [Abstract] 2014 Operating Leases, Future Minimum Payments Receivable, Current 2018 Operating Leases, Future Minimum Payments Receivable, in Five Years 2017 Operating Leases, Future Minimum Payments Receivable, in Four Years 2016 Operating Leases, Future Minimum Payments Receivable, in Three Years 2015 Operating Leases, Future Minimum Payments Receivable, in Two Years Thereafter Operating Leases, Future Minimum Payments Receivable, Thereafter Operating Leases, Income Statement, Contingent Revenue Overage rent Operating Leases, Income Statement, Minimum Lease Revenue Minimum rent Rentals under Operating Leases Operating Leases of Lessor Disclosure [Text Block] Basis of Presentation Origination of Notes Receivable from Related Parties Funding of loans to related parties Other comprehensive income (loss) before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Other comprehensive income Other Comprehensive Income (Loss), Net of Tax Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Net current-period other comprehensive income (loss) Net loss reclassified from accumulated other comprehensive income into earnings Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax Net loss reclassified from accumulated other comprehensive loss into earnings Other Comprehensive (Income) Loss, Net of Tax, Portion Attributable to Noncontrolling Interest [Abstract] Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Unrealized (loss) gain on derivative hedge agreements Other Cost and Expense, Operating Other Other Other Credit Derivatives [Member] Other Income Other income Other Liabilities Other liabilities Other liabilities Other Liabilities [Member] Nonredeemable noncontrolling deficit interests in properties, net Other Noncontrolling Interests Other Partners' Capital Partners' deficit Other Properties Other Retail Property Other Property [Member] Amount included in gain reclassified from accumulated other comprehensive income (loss) Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net Simon Property Group, Inc. Simon Property Parent Company [Member] Partially Owned Properties [Member] Partially owned properties Real estate property interests Partners' Capital Total partners' equity Partners' Capital [Abstract] Partners' Equity General partner contributions (1,567 units, 712 units and 324,720 units for the years ended 2013, 2012 and 2011 and net of 76,969 units used to fund required withholding tax for the year ended 2011) Partners' Capital Account, Contributions Distributions, excluding distributions on preferred interests classified as temporary equity Partners' Capital Account, Distributions Distributions to limited partners, excluding preferred interests classified as temporary equity Partners' Capital Account, Exchanges and Conversions Series I preferred units (1,017,480 units) converted to limited partner common units (862,292 units) Stock incentive program (107,123, 114,066 and 116,885 units, net for the years ended 2013, 2012 and 2011) Partners' Capital Account, Unit-based Compensation Partners' Capital Account, Units, Acquisitions Units issued in connection with the acquisition General partner contributions, units Partners' Capital Account, Units, Contributed Limited partner units exchanged to common units Partners' Capital Account, Units, Converted The number of common stock shares issued in exchange for partnership units Operating Partnership redeemed units Units Retired Partners' Capital Account, Units, Redeemed Stock incentive program, units Partners' Capital Account, Units, Unit-based Compensation Equity Partners' Capital Notes Disclosure [Text Block] Equity Partnership Income [Abstract] NET INCOME ATTRIBUTABLE TO UNITHOLDERS ATTRIBUTABLE TO: Partner Type [Axis] Partner Type of Partners' Capital Account, Name [Domain] Payments for (Proceeds from) Productive Assets Capital expenditures, net Payments for Repurchase of Redeemable Preferred Stock Preferred unit redemptions Aggregate cash purchase price for acquisition Payments to Acquire Businesses, Gross Purchase price of business acquired Payments to Acquire Equity Method Investments Purchase price of equity method investment acquired Contribution to SPG-FCM ventures Payments to Acquire Interest in Joint Venture Payments to Acquire Interest in Subsidiaries and Affiliates Investments in unconsolidated entities Payments to Acquire Investments Purchase of marketable and non-marketable securities Purchase of loans held for investment Payments to Acquire Loans Held-for-investment Capital expenditures on a cash basis Payments to Acquire Property, Plant, and Equipment Acquisitions Payments to Acquire Real Estate and Real Estate Joint Ventures Payments to Acquire Trust Preferred Investments Trust preferred securities retired Payments to Noncontrolling Interests Distributions to noncontrolling interest holders in properties Plan Name [Axis] Plan Name [Domain] Temporary equity stated dividend rate percentage Preferred Stock, Dividend Rate, Percentage Dividend rate on cumulative redeemable preferred units (as a percent) Preferred stock stated dividend rate percentage Cumulative quarterly distributions on preferred units (in dollars per share) Preferred Stock, Dividend Rate, Per-Dollar-Amount Liquidation preference (in dollars per share) Preferred Stock, Liquidation Preference Per Share Preferred units, Liquidation value (in dollars) Preferred Stock, Liquidation Preference, Value Preferred Units Preferred Stock [Member] Redemption price of preferred stock (in dollars per share) Preferred Stock, Redemption Price Per Share Preferred units, authorized Preferred Units, Authorized Preferred units, issued Preferred Units, Issued Preferred Units, Outstanding Preferred units, units outstanding Preferred units, outstanding Preferred units, 796,948 units outstanding. Liquidation value of $39,847 Preferred Units, Preferred Partners' Capital Accounts Preferred units Proceeds from issuance of debt related to Washington Prime properties, net Proceeds from Debt, Net of Issuance Costs Amount of retained proceeds from recently completed unsecured debt and mortgage debt as part of the spin-off Proceeds from Divestiture of Interest in Joint Venture Proceeds from sale of interest in joint venture Distributions of capital from unconsolidated entities Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital Proceeds from Insurance Settlement, Operating Activities Insurance proceeds funded by insurers Insurance proceeds funded by insurers Proceeds from Issuance of Common Stock Proceeds from common stock issued in a public offering Proceeds from Issuance of Long-term Debt and Capital Securities, Net Mortgage and unsecured indebtedness proceeds, net of transaction costs Proceeds from Issuance or Sale of Equity Issuance of units Proceeds from Noncontrolling Interests Contributions from noncontrolling interest holders in properties Proceeds from sale or disposal of real estate assets Proceeds from Real Estate and Real Estate Joint Ventures Proceeds from Sale, Maturity and Collection of Investments Proceeds from sale of marketable and non-marketable securities Proceeds received from the sale of investments Proceeds from Sale of Available-for-sale Securities, Equity Repayments of loans held for investment Proceeds from Sale of Loans Held-for-investment Net proceeds of option exercises (in dollars) Proceeds from Stock Options Exercised Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Consolidated Net Income CONSOLIDATED NET INCOME Consolidated net income Consolidated income from continuing operations Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment [Line Items] Investment properties Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Useful Life Useful life Depreciable life Property Subject to or Available for Operating Lease, by Major Property Class [Table] Lease Commitments Property Subject to or Available for Operating Lease [Line Items] Provision for credit losses Provision for Loan and Lease Losses Provision for Loan, Lease, and Other Losses Provision for (recovery of) credit losses Provision for credit losses Quarterly Financial Data (Unaudited) Quarterly Financial Data (Unaudited) Quarterly Financial Information [Text Block] Range [Axis] Range [Domain] Investment Properties SEC Schedule III, Real Estate Accumulated Depreciation Balance, beginning of year Balance, close of year Accumulated Depreciation SEC Schedule III, Real Estate Accumulated Depreciation, Real Estate Sold Disposals and deconsolidations SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances Encumbrances SEC Schedule III, Real Estate and Accumulated Depreciation, by Property [Table] SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements Buildings and Improvements SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land Land SEC Schedule III, Real Estate, Gross [Abstract] Gross Amounts At Which Carried At Close of Period Name of Property [Axis] SCHEDULE III Real Estate and Accumulated Depreciation SCHEDULE III Real Estate and Accumulated Depreciation SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Text Block] SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost [Abstract] Initial Cost SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements Buildings and Improvements SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land Land SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] Real Estate and Accumulated Depreciation Estimated original lives Name of Property [Domain] SEC Schedule III, Real Estate, Cost of Real Estate Sold Disposals and deconsolidations Unaudited aggregate cost of real estate for federal income tax purposes SEC Schedule III, Real Estate, Federal Income Tax Basis SEC Schedule III, Real Estate, Gross Balance, beginning of year Balance, close of year Total SEC Schedule III, Real Estate, Improvements Improvements Original investment de-merged into CSCG and CAPC Real Estate Investment [Member] Real Estate Investment Property, Accumulated Depreciation Less - accumulated depreciation Real Estate Investment Property, at Cost Investment properties, at cost Investment properties at cost Investment properties at cost Real Estate Investment Property, Net Investment properties, net Real Estate Investments, Net [Abstract] Investment properties Acquisitions and consolidations SEC Schedule III, Real Estate, Other Acquisitions Property interest acquired Investment Properties Real Estate Owned [Text Block] Real Estate Property Ownership [Axis] Real Estate Properties [Domain] Real Estate Properties [Line Items] Owned, developed and managed retail properties Basis of Presentation Insurance Real Estate Taxes and Insurance [Abstract] Real Estate Tax Expense Real estate taxes Allowance for Credit Losses Receivables, Policy [Policy Text Block] Receivable [Domain] Significant Accounting Policies Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Amounts reclassified from accumulated other comprehensive income (loss) Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Domain] Amount reclassified from accumulated other comprehensive income (loss) Reclassification out of Accumulated Other Comprehensive Income [Member] Reclassification out of Accumulated Other Comprehensive Income [Table] Schedule of reclassifications out of accumulated other comprehensive income (loss) Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] SEC Schedule III, Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward] Reconciliation of Real Estate Properties: SEC Schedule III, Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] Reconciliation of Accumulated Depreciation: Related Party [Domain] Related Party Transaction [Axis] Related Party Transaction [Domain] Related party transactions Related Party Transaction [Line Items] Related Party Transactions Related Party [Axis] Related Party Transactions Related Party Transactions Disclosure [Text Block] Repayment of Notes Receivable from Related Parties Repayments of loans to related parties Repayment of TMLP senior loan facility Repayments of Assumed Debt Debt repaid Repayments of Debt Debt refinanced Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities Mortgage and unsecured indebtedness principal payments Restricted Stock [Member] Restricted stock Retained Earnings (Accumulated Deficit) Partners' deficit Amounts charged to related party Revenue from Related Parties Revenue Recognition Revenue Recognition [Abstract] Revenue Recognition Revenue Recognition Leases, Operating [Policy Text Block] Management Fees and Other Revenues Revenue Recognition, Sales of Services [Policy Text Block] Revenues Total revenue Total revenue TOTAL REVENUE Revenues [Abstract] REVENUE: Summarized financial information for discontinued operations Sale of Stock, Percentage of Ownership after Transaction Joint venture ownership percentage after transactions Joint venture ownership percentage before transaction Sale of Stock, Percentage of Ownership before Transaction Joint venture ownership percentage Consolidated revenues Sales Revenue, Goods, Net [Member] Scenario, Previously Reported [Member] Preliminary Allocations Scenario, Unspecified [Domain] Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule of changes in accumulated other comprehensive income (loss) by component Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] Schedule of fair value of fixed rate mortgages and the related discount rate assumptions Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Schedule of cash paid for interest in each period, net of any amounts capitalized Cost method investments Schedule of Cost-method Investments [Line Items] Schedule of Cost-method Investments [Table] Schedule of mortgages and unsecured indebtedness Schedule of Debt [Table Text Block] Schedule of Derivative Instruments [Table Text Block] Schedule of outstanding interest rate derivatives related to interest rate risk Schedule of computation of basic and diluted earnings per unit Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Investment, Name [Axis] Real Estate Joint Ventures and Investments Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments Schedule of Equity Method Investments [Table] Schedule of estimated future amortization and the increasing (decreasing) effect on minimum rents for above and below market leases Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Schedule of intangible assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Schedule of future minimum lease payments due under leases, excluding applicable extension options and any sublease income Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Schedule of Guarantor Obligations [Table] Schedule of principal repayments of indebtedness Schedule of Maturities of Long-term Debt [Table Text Block] Scheduled principal payment repayments on joint venture properties' mortgages and other indebtedness Property, Plant and Equipment [Table] Schedule of Quarterly Financial Information [Table Text Block] Schedule of quarterly financial data Schedule of Real Estate Properties [Table] Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Schedule of amounts of assets acquired and liabilities assumed Schedule of Related Party Transactions, by Related Party [Table] Schedule of related party transactions Schedule of Related Party Transactions [Table Text Block] Schedule of Rent Expense [Table Text Block] Schedule of ground lease expense and home office and regional expense incurred, included in other expense Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of restricted stock awards Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of Director Options and Employee Options activity Schedule of Stock by Class [Table] Schedule of Stockholders Equity [Table Text Block] Reconciliation of carrying amounts of equity Depreciation expense SEC Schedule III, Real Estate Accumulated Depreciation, Depreciation Expense Buildings and Improvements SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements Costs Capitalized Subsequent to Acquisition SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [Abstract] Land SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Land Secured Debt [Member] Secured Debt Secured Debt Geographical [Domain] Segment Disclosure Segment Reporting [Abstract] Segment Disclosure Segment Reporting, Policy [Policy Text Block] Insurance reserve for insurance subsidiaries and other self-insurance programs Self Insurance Reserve Service period Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Vesting rights percentage Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Restricted stock awards granted (in shares) Award of restricted stock to employees (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Award of restricted stock to employees, fair market value (in dollars per share) Weighted average fair value of shares granted during the year (in dollars per share) Units to be earned under LTIP program (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Expiration period Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Equity Stock-based incentive plan awards Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Shares reserved for issuance Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures Units earned Units earned under LTIP program (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Shares under option at the beginning of the period Shares under option at the end of the period Options outstanding (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Options Shares under option at the beginning of the period (in dollars per share) Shares under option at the end of the period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Weighted Average Exercise Price Per Share Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Weighted average life of outstanding options Equity Award [Domain] Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Exercised (in dollars per share) Significant Accounting Policies [Text Block] Significant Accounting Policies Class of Stock [Axis] Equity Components [Axis] Geographical [Axis] Statement Statement [Line Items] Schedule of changes in equity attributable to partners and to noncontrolling interests: Consolidated Statements of Cash Flows Consolidated Balance Sheets Consolidated Statements of Equity Scenario [Axis] Statement [Table] Balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total equity Balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] EQUITY: Spin-off of Washington Prime Stockholders' Equity Note, Spinoff Transaction Notes Receivable from Former CPI Stockholders Stockholders' Equity Note, Subscriptions Receivable Stockholders' Equity, Other Other Other Stockholders' Equity, Period Increase (Decrease) Accumulated Other Comprehensive Income (Loss) Stockholders' Equity, Policy [Policy Text Block] The number of common stock shares issued in exchange for partnership units Stock Issued During Period, Shares, Conversion of Units Stock Issued During Period, Shares, New Issues Issuance of units related to Simon Property's public offering of its common stock Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Exercised (in shares) Exercised (in shares) Stock Issued During Period, Value, Conversion of Convertible Securities Series I preferred units (7,871,276 units) converted to common units (6,670,589 units) Stock Issued During Period, Value, New Issues Issuance of units related to Simon Property's public offering of its common stock (9,137,500 units) Long-term incentive performance units Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures Units Retired (2,000,000 and 61,584 units for the years ended 2012 and 2011) Stock Repurchased and Retired During Period, Value Straight-line rent Straight Line Rent Subsequent Event Subsequent Event [Member] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Summary Investment Holdings [Table Text Block] Schedule of investment properties Temporary Equity [Abstract] Temporary Equity Temporary Equity, by Class of Stock [Table] Redeemable preferred stock Temporary Equity [Line Items] Temporary equity redemption price (in dollars per share) Temporary Equity, Redemption Price Per Share Temporary equity, shares authorized Temporary Equity, Shares Authorized Temporary equity, shares issued Temporary Equity, Shares Issued Temporary equity, shares outstanding Temporary Equity, Shares Outstanding Tenant Reimbursements Tenant reimbursements Title of Individual [Axis] Relationship to Entity [Domain] Unconsolidated Properties [Member] Unconsolidated properties Unconsolidated property interests Unamortized loss of benefits from treasury and interest rate hedge agreements Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss) Unsecured Debt [Member] Unsecured Debt Use of Estimates Use of Estimates, Policy [Policy Text Block] Vesting [Axis] Vesting [Domain] Weighted Average [Member] Weighted average Weighted Average Units Outstanding - Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Weighted Average Number of Shares Outstanding, Basic Weighted Average Number of Shares Outstanding, Basic Wholly Owned Properties [Member] Wholly owned properties Canada CANADA UNITED KINGDOM United Kingdom Italy ITALY Japan joint ventures JAPAN Japan South Korea joint ventures KOREA, REPUBLIC OF South Korea MEXICO Mexico Mexico joint venture Malaysia Malaysia joint venture MALAYSIA Netherlands NETHERLANDS UNITED STATES United States US All Currencies [Domain] Euro Member Countries, Euro Euro Yen Japan, Yen Amendment Description Amendment Flag Current Fiscal Year End Date Document Fiscal Period Focus Document Fiscal Year Focus Document Period End Date Document Type Entity Central Index Key Entity Common Stock, Shares Outstanding Entity Current Reporting Status Entity [Domain] Entity Filer Category Entity Public Float Entity Registrant Name Entity Voluntary Filers Entity Well-known Seasoned Issuer Legal Entity [Axis] Derivative, Notional Amount Notional Amount All States and Provinces [Domain] TENNESSEE Nashville, TN ABQ Uptown, Albuquerque, NM ABQ Uptown, Albuquerque, NM [Member] Represents information pertaining to ABQ Uptown located at Albuquerque, NM. ABQ Uptown [Member] Albuquerque, New Mexico lifestyle center Represents the acquisition ABQ Uptown. Accounts payable, accrued expenses, intangibles, and deferred revenues Accounts Payable, Accrued Expenses, Intangibles and Deferred Revenues The summation of accounts payable, accrued expenses, intangibles, and deferred revenues. Accounts payable, accrued expenses, intangibles, and deferred revenues The accumulated amortization, as of the reporting date, representing the sum of the periodic charge to earnings of deferred costs which are associated with debt obligations existing as of the end of the period and the periodic charge to earnings of initial direct costs which have been deferred and are being allocated over the lease term in proportion to the recognition of rental income. Accumulated Amortization Deferred Financing and Lease Costs Accumulated amortization Accumulated Other Comprehensive income (Loss) including Portion Attributable to Noncontrolling Interest Net of Tax Total accumulated other comprehensive loss Represents the accumulated other comprehensive income (loss) including portion attributable to noncontrolling interest. Number of properties acquired Acquisition Number of Properties Acquired The number of properties acquired under an acquisition, as of the balance sheet date. Acquisition, number of outlet centers acquired Additional insurance proceeds Additional Proceeds from Insurance Settlement, Operating Activities Maximum Represents the maximum amount of additional insurance proceeds to be received from insurance provider. Amortization of stock incentive Adjustments to Additional Paid in Capital Share Based Compensation Amortization Adjustment to additional paid-in-capital resulting from the periodic adjustments of stock incentives. Adjustment to limited partners' interest from change in ownership in the Operating Partnership Represents the adjustment to limited partners' interest from increase (decrease) in ownership in the operating partnership during the reporting period. Adjustment to Limited Partners Interest from Increase (Decrease) in Ownership in Operating Partnership This element represents adjustment to limited partners' interest from increased ownership in the operating partnership during the reporting period. Adjustment to Limited Partners Interest from Increased Ownership in Operating Partnership Adjustment to limited partners' interest from change in ownership in the Operating Partnership Represents information pertaining to Albertville Premium Outlets located at Albertville (Minneapolis), MN. Albertville Premium Outlets, Albertville (Minneapolis), MN Albertville Premium Outlets, Albertville (Minneapolis), MN [Member] Represents information pertaining to Allen Premium Outlets located at Allen (Dallas), TX. Allen Premium Outlets, Allen (Dallas), TX Allen Premium Outlets, Allen (Dallas), TX [Member] Allocated Share Based Compensation Expense Net of Capitalization Compensation expense, net of capitalization Represents the expense recognized, net of capitalization during the period arising from the equity-based compensation arrangements. Allowance for Loan and Lease Losses Consolidation of Previously Unconsolidated Entities Consolidation of previously unconsolidated properties Reflects additions to the allowance for loan and lease losses arising due to consolidation of previously unconsolidated entities. Amended Credit Facility [Member] Amended Credit Facility Represents information pertaining to the amendment made to the Credit Facility. Lease intangibles assets, net Amortization Lease Income Expense Amount after amortization expense (income) for lease intangibles. Represents information pertaining to Anderson Mall located at Anderson, SC. Anderson Mall, Anderson, SC Anderson Mall, Anderson, SC [Member] Annual fixed rate property management fees (as a percent) Represents the percentage of annual fixed rate property management fees. Annual Fixed Rate Property Management Fee Percentage Arboretum, Austin, TX [Member] Represents information pertaining to Arboretum located at Austin, TX. Arboretum, Austin, TX Arizona Mills Represents information regarding the joint venture pertaining to Arizona Mills. Arizona Mills [Member] Arsenal Mall, Watertown (Boston), MA Arsenal Mall, Watertown (Boston), MA [Member] Represents information pertaining to Arsenal Mall located at Watertown (Boston), MA. Ashford Designer Outlets [Member] Ashford Designer Outlets Represents information pertaining to the Ashford Designer Outlets. Aurora Farms Premium Outlets, Aurora (Cleveland), OH [Member] Represents information pertaining to Aurora Farms Premium Outlets located at Aurora (Cleveland), OH. Aurora Farms Premium Outlets, Aurora (Cleveland), OH Austria [Member] Austria Represents information pertaining to Austria. Austria Netherlands and United Kingdom [Member] Austria, the Netherlands, and the United Kingdom Represents information pertaining to Austria, the Netherlands, and the United Kingdom. Aventura Mall [Member] Aventura Mall Represents information pertaining to Aventura Mall. Bangor Mall, Bangor, ME [Member] Represents information pertaining to Bangor Mall located at Bangor, ME. Bangor Mall, Bangor, ME Represents information pertaining to Barton Creek Square located at Austin, TX. Barton Creek Square, Austin, TX Barton Creek Square, Austin, TX [Member] Basis of Presentation Basis of Presentation and Consolidation Disclosure [Text Block] Describes an entity's accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting. An entity also may describe its accounting treatment for intercompany accounts and transactions, minority interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary. Also discloses any material changes in classifications in the current financial statements compared to the classifications in the prior year's financial statements, including an explanation of the reason for the change and the areas impacted. Battlefield Mall, Springfield, MO [Member] Represents information pertaining to Battlefield Mall located at Springfield, MO. Battlefield Mall, Springfield, MO Bay Park Square, Green Bay, WI [Member] Represents information pertaining to Bay Park Square located at Green Bay, WI. Bay Park Square, Green Bay, WI Birch Run Premium Outlets, Birch Run, MI [Member] Represents information pertaining to Birch Run Premium Outlets located at Birch Run, MI. Birch Run Premium Outlets, Birch Run (Detroit), MI Bloomingdale Court, Bloomingdale (Chicago), IL Bloomingdale Court, Bloomingdale (Chicago), IL [Member] Represents information pertaining to Bloomingdale Court located at Bloomingdale (Chicago), IL. Bowie Town Center, Bowie (Washington, D.C.), MD [Member] Represents information pertaining to Bowie Town Center located at Bowie (Washington, D.C.), MD. Bowie Town Center, Bowie (Washington, D.C.), MD Boynton Beach Mall, Boynton Beach (Miami), FL [Member] Represents information pertaining to Boynton Beach Mall located at Boynton Beach (Miami), FL. Boynton Beach Mall, Boynton Beach (Miami), FL Brea Mall, Brea (Los Angeles), CA [Member] Represents information pertaining to Brea Mall located at Brea (Los Angeles), CA. Brea Mall, Brea (Los Angeles), CA Broadway Square, Tyler, TX [Member] Represents information pertaining to Broadway Square located at Tyler, TX. Broadway Square, Tyler, TX Brunswick Square, East Brunswick (New York), NJ [Member] Represents information pertaining to Brunswick Square located at East Brunswick (New York), NJ. Brunswick Square, East Brunswick (New York), NJ Burlington Mall, Burlington (Boston), MA [Member] Represents information pertaining to Burlington Mall located at Burlington (Boston), MA. Burlington Mall, Burlington (Boston), MA Business Acquisition Percentage of Ownership Acquired Additional business acquisition percentage of ownership acquired This element represents additional percentage of ownership interests acquired in the business combination. Business Acquisition, Purchase Price Allocation, Current Assets, Tenant Receivables and Accrued Revenue, Net Tenant receivables and accrued revenue, net The amount of tenant receivables and accrued revenue, net, acquired in a business combination. Mortgage debt including debt premiums Business Acquisition Purchase Price Allocation Debt, Discount The amount of deferred costs and other assets including intangibles acquired in a business combination. Deferred costs and other assets (including intangibles) Business Acquisition Purchase Price Allocation Deferred Costs and Other Assets Business Acquisition Purchase Price Allocation Investment in Unconsolidated Properties in which Additional Interest Acquired Represents the amount of investment in unconsolidated properties in which we obtained an additional interest acquired in a business combination. Investment in unconsolidated properties in which additional interest is obtained The amount of acquisition cost of a business combination allocated to the mortgages and other indebtedness of the acquired entity. Business Acquisition, Purchase Price Allocation, Liabilities Mortgages and Other Indebtedness Mortgages and other indebtedness, including premiums Business Acquisition, Purchase Price Allocation, Other Current Liabilities Accounts payable, accrued expenses, intangibles and other The amount of acquisition cost of a business combination allocated to the accounts payable, accrued expenses, intangibles and other current liabilities of the acquired entity. Business Combination Consideration Transferred Cash Percentage Consideration paid in cash, percentage Percentage of total acquisition price paid in cash. Amount of acquiree debt owed to the acquirer extinguished (noncash) by the acquirer as part of consideration transferred for acquisition. Business Combination Consideration Transferred Debt Extinguished Construction loans extinguished upon acquisition Business Combination Consideration Transferred Issuance of Units Percentage Consideration paid by issuance of units, percentage Percentage of total acquisition price settled with equity units issued. Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Current Assets Investment Properties Investment properties Investment properties allocation at fair value Represents amount of current assets and investment properties acquired at the acquisition date. Calhoun Premium Outlets, Calhoun, GA [Member] Represents information pertaining to Calhoun Premium Outlets located at Calhoun, GA. Calhoun Premium Outlets, Calhoun, GA Camarillo Premium Outlets, Camarillo (Los Angeles), CA [Member] Represents information pertaining to Camarillo Premium Outlets located at Camarillo (Los Angeles), CA. Camarillo Premium Outlets, Camarillo (Los Angeles), CA Represents the investment in Capital & Counties Properties PLC. Capital and Counties Properties PLC [Member] CAPC Represents the investment in Capital Shopping Centres Group PLC. Capital Shopping Centres Group PLC [Member] CSCG Carlsbad Premium Outlets, Carlsbad (San Diego), CA [Member] Represents information pertaining to Carlsbad Premium Outlets located at Carlsbad (San Diego), CA. Carlsbad Premium Outlets, Carlsbad (San Diego), CA Carolina Premium Outlets, Smithfield, NC [Member] Represents information pertaining to Carolina Premium Outlets located at Smithfield, NC. Carolina Premium Outlets, Smithfield (Raleigh), NC Cash Distributions and Losses in Partnerships and Joint Ventures, at Equity. Cash distributions and losses in partnerships and joint ventures, at equity Cash Distributions and Losses in Partnerships and Joint Ventures, at Equity Represents the cash inflow associated with the acquisition of business during the period and cash impact from the consolidation and deconsolidation of properties. Cash from Acquisitions and Cash Impact from the Consolidation and Deconsolidation of Properties Cash impact from the consolidation of properties Cash inflow and outflow from acquisitions and from consolidation and deconsolidation of properties. Cash from Acquisitions and Cash Impact of Property Consolidation and Deconsolidation Cash impact from the consolidation of properties Castleton Square, Indianapolis, IN [Member] Represents information pertaining to Castleton Square located at Indianapolis, IN. Castleton Square, Indianapolis, IN Changes in Available For Sale Securities and Other Gross appreciation or the gross loss in value of the total unsold securities at the end of an accounting period, after tax, plus other increases (decreases) in other comprehensive income not otherwise identified. Changes in available-for-sale securities and other Charles Towne Square, Charleston, SC [Member] Represents information pertaining to Charles Towne Square located at Charleston, SC. Charles Towne Square, Charleston, SC Charlottesville Fashion Square, Charlottesville, VA [Member] Represents information pertaining to Charlottesville Fashion Square located at Charlottesville, VA. Charlottesville Fashion Square, Charlottesville, VA Chautauqua Mall, Lakewood, NY [Member] Represents information pertaining to Chautauqua Mall located at Lakewood, NY. Chautauqua Mall, Lakewood, NY Chesapeake Center, Chesapeake (Virginia Beach), VA [Member] Represents information pertaining to Chesapeake Center located at Chesapeake (Virginia Beach), VA. Chesapeake Center, Chesapeake (Virginia Beach), VA Chesapeake Square, Chesapeake (Virginia Beach), VA [Member] Represents information pertaining to Chesapeake Square located at Chesapeake (Virginia Beach), VA. Chesapeake Square, Chesapeake (Virginia Beach), VA Chicago Premium Outlets, Aurora (Chicago), IL [Member] Represents information pertaining to Chicago Premium Outlets located at Aurora (Chicago), IL. Chicago Premium Outlets, Aurora (Chicago), IL Cielo Vista Mall, El Paso, TX [Member] Represents information pertaining to Cielo Vista Mall located at El Paso, TX. Cielo Vista Mall, El Paso, TX Cincinnati Premium Outlets, Monroe (Cincinnati), OH [Member] Represents information pertaining to Cincinnati Premium Outlets located at Monroe (Cincinnati), OH. Cincinnati Premium Outlets, Monroe (Cincinnati), OH Clinton Crossing Premium Outlets, Clinton, CT [Member] Represents information pertaining to Clinton Crossing Premium Outlets located at Clinton, CT. Clinton Crossing Premium Outlets, Clinton, CT College Mall, Bloomington, IN [Member] Represents information pertaining to College Mall located at Bloomington, IN. College Mall, Bloomington, IN Columbia Center, Kennewick, WA [Member] Represents information pertaining to Columbia Center located at Kennewick, WA. Columbia Center, Kennewick, WA Columbia Gorge Premium Outlets, Troutdale (Portland), OR [Member] Represents information pertaining to Columbia Gorge Premium Outlets located at Troutdale (Portland), OR. Columbia Gorge Premium Outlets, Troutdale (Portland), OR Represents the percentage of the entity's leases for which a fixed payment is received from the tenant for the common area maintenance. Common Area Maintenance Fixed Payment Received from Tenant Leases for which fixed payment is received for CAM component (as a percent) Common Units Issued During Period Units Conversion of Preferred Units Series I preferred units converted to common units The number of common units converted from preferred units during the reporting period. Community Centers [Member] community centers Represents the information pertaining to community centers. Community Centers Community Lifestyle Centers [Member] Community/Lifestyle Centers Represents information pertaining to Community Lifestyle Centers. Community Centers Comprehensive income, attributable to preferred distributions on temporary equity preferred units Represents comprehensive income (loss) attributable to preferred distributions on temporary equity preferred units during the reporting period. Comprehensive Income, Attributable to Preferred Distributions on Temporary Equity Preferred Units The amount of comprehensive income (loss), excluding preferred distributions of the Operating Partnership that are related to units included in temporary equity. Comprehensive income, excluding $957 attributable to preferred distributions on temporary equity preferred units Comprehensive Income, Net of Tax Including Portion Attributable to Noncontrolling Interest Excluding Preferred Distributions Concord Mills Marketplace Concord Charlotte NC [Member] Represents information pertaining to Concord Mills Marketplace located at Concord (Charlotte), NC. Concord Mills Marketplace, Concord (Charlotte), NC Construction and Other Related Party Loans [Member] Construction and other related party loans Represents the borrowing arrangement, which provides the entity constructing a facility (such as a building and a landfill) with funds to effect construction, generally on a draw down, or as needed, basis and includes information pertaining to the related party loans not otherwise specified in the taxonomy. Contributions from Limited Partners and other Contributions from noncontrolling interest partners Represents the amount of contributions from limited partners and other. Contributions from noncontrolling nonredeemable interestholders Represents the amount of contributions from noncontrolling nonredeemable interestholders. Contributions from Noncontrolling Nonredeemable Interest Holders Total contributions made into the noncontrolling interest partnership in exchange for new series of preferred partnership units. Contribution to Noncontrolling Interest Partnership Contribution into the noncontrolling interest partnership The number of income producing properties for which the entity obtained a controlling interest in during the period. Number of properties acquired Number of income-producing properties acquired Controlling Interest Income Producing Properties Number Copley Place, Boston, MA [Member] Represents information pertaining to Copley Place located at Boston, MA. Copley Place, Boston, MA Coral Square, Coral Springs (Miami), FL [Member] Represents information pertaining to Coral Square located at Coral Springs (Miami), FL. Coral Square, Coral Springs (Miami), FL Cordova Mall, Pensacola, FL [Member] Represents information pertaining to Cordova Mall located at Pensacola, FL. Cordova Mall, Pensacola, FL Corporate and Transaction Related Expenses [Abstract] Corporate and Transaction Related Expenses Corporate and Transaction Related Expenses [Policy Text Block] Describes an entity's accounting policies for corporate and transaction related expenses. Corporate Expenses Corporate Debt Securities 1.50 Percent Due February 2018 [Member] Senior unsecured notes 1.50% due February 2018 Represents the debt securities having an interest rate of 1.50 percent, due on February 1, 2018 issued by the entity. Corporate Debt Securities 2.15 Percent [Member] Senior unsecured notes 2.15% Debt securities having interest rate of 2.15% issued by the entity. Corporate Debt Securities 2.20 Percent Due February 2019 [Member] Senior unsecured notes 2.20% due February 2019 Represents the debt securities having an interest rate of 2.20 percent, due on February 1, 2019 issued by the entity. Corporate Debt Securities 2.375 Percent Due October 2020 [Member] Senior unsecured notes 2.375% due October 2020 Represents the debt securities having an interest rate of 1.50 percent, due on October 2020 issued by the entity. Senior unsecured notes 2.375% due October 2020 Represents the debt securities having an interest rate of 2.375%, due on October 2, 2020 issued by the entity. Corporate Debt Securities 2.375 Percent [Member] Corporate Debt Securities 2.75 Percent Due February 2023 [Member] Senior unsecured notes 2.75% due February 2023 Represents the debt securities having an interest rate of 2.75 percent, due on February 1, 2023 issued by the entity. Corporate Debt Securities 3.375 Percent [Member] Senior unsecured notes 3.375% Debt securities having interest rate of 3.375% issued by the entity. Corporate Debt Securities 3.75 Percent Due February 2024 [Member] Senior unsecured notes 3.75% due February 2024 Represents the debt securities having an interest rate of 3.75 percent, due on February 1, 2024 issued by the entity. Corporate Debt Securities 4.75 Percent [Member] Senior unsecured notes 4.75% Debt securities having interest rate of 4.75% issued by the entity. Corporate Debt Securities 4.9 Percent to 6.75 Percent [Member] Senior unsecured notes 4.9% to 6.75% Represents the debt securities having interest rates ranging from 4.9 percent to 6.75 percent, issued by the entity. Represents the debt securities having interest rates ranging from 5.30 percent to 6.00 percent, issued by the entity. Corporate Debt Securities, 5.30 Percent to 6.00 Percent [Member] Senior unsecured notes 5.30% to 6.00% Corporate Debt Securities, 5.30 Percent to 7.18 Percent [Member] Senior unsecured notes 5.30% to 7.18% Represents the debt securities having interest rates ranging from 5.30 percent to 7.18 percent, issued by the entity. Corporate Debt Securities 5.75 Percent to 6.88 Percent [Member] Senior unsecured notes 5.75% to 6.88% Represents the debt securities having interest rates ranging from 5.75 percent to 6.88 percent, issued by the entity. Cottonwood Mall, Albuquerque, NM [Member] Represents information pertaining to Cottonwood Mall located at Albuquerque, NM. Cottonwood Mall, Albuquerque, NM Countryside Plaza, Countryside (Chicago), IL [Member] Represents information pertaining to Countryside Plaza located at Countryside (Chicago), IL. Countryside Plaza, Countryside (Chicago), IL Represents the 7.5% Cumulative Redeemable Preferred Units which are classified as temporary equity by the entity. 7.5% Cumulative Redeemable Preferred Units Cumulative Redeemable Preferred Units 7.50 Percent [Member] Dare Centre, Kill Devil Hills, NC [Member] Represents information pertaining to Dare Centre located at Kill Devil Hills, NC. Dare Centre, Kill Devil Hills, NC Debt and Derivative Instruments Disclosure [Text Block] Indebtedness and Derivative Financial Instruments The complete disclosure of indebtedness and derivative financial instruments. The disclosure on indebtedness includes information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. The disclosure of derivative financial instruments includes a description of risk management strategies, derivatives in hedging activities and nonhedging derivative instruments, the assets, obligations, liabilities, revenues and expenses arising there from, and the amounts of and methodologies and assumptions. Debt covenants Debt Covenants [Abstract] Debt Instrument, Extension Period Debt instrument extension period The length of time for which a debt instrument may be extended. Represents the weighted-average maturity period for fixed-rate debt instruments. Weighted average maturity period, fixed-rate debt Debt Instrument, Fixed Rate Maturity Period Debt Instrument Interest Rate Stated Percentage before Reduction Fixed interest rate before reduction (as a percent) Represents the contractual interest rate for funds borrowed before reduction, under the debt agreement. Debt Instrument Prepayment Penalty Prepayment penalty Represents the amount of prepayment penalty under the debt agreement. Debt Instrument, Reduction in Basis Spread on Variable Rate Reduction in interest added to reference rate (as a percent) Represents the reduction in percentage points added to the reference rate to compute the variable rate on the debt instrument. Debt Instrument, Variable Rate Maturity Period Represents the weighted-average maturity period for variable-rate debt instruments. Weighted average maturity period, variable-rate debt Deferred Costs and Other Assets [Abstract] Deferred costs and other assets Deferred costs and other assets Primary financial statement caption encompassing deferred costs and other assets. Deferred Costs and Other Assets [Member] Deferred Costs and Other Assets [Policy Text Block] Deferred Costs and Other Assets Description of an entity's accounting policy related to deferred costs and other assets. Deferred Financing and Leasing Costs [Abstract] Deferred Financing and Lease Costs Represents the sum of capitalized costs associated with the issuance of debt instruments and costs incurred by a lessor that are (a) costs to originate a lease incurred in transactions with independent third parties that (i) result directly from and are essential to acquire that lease and (ii) would not have been incurred had that leasing transaction not occurred and (b) certain costs directly related to specified activities performed by the lessor for that lease. Such amount is before the consideration of accumulated amortization. Deferred Financing and Leasing Costs Gross Deferred financing and lease costs, gross Deferred Financing and Leasing Costs Net Deferred financing and lease costs, net Represents the sum of capitalized costs associated with the issuance of debt instruments and costs incurred by a lessor that are (a) costs to originate a lease incurred in transactions with independent third parties that (i) result directly from and are essential to acquire that lease and (ii) would not have been incurred had that leasing transaction not occurred and (b) certain costs directly related to specified activities performed by the lessor for that lease. This element is net of accumulated amortization. Deferred financing and lease costs, net DeKalb Plaza, King of Prussia (Philadelphia), PA [Member] Represents information pertaining to DeKalb Plaza located at King of Prussia (Philadelphia), PA. DeKalb Plaza, King of Prussia (Philadelphia), PA Represents acquisition of Del Amo Fashion Center. Del Amo Fashion Center [Member] Del Amo Fashion Center Depreciation and amortization Depreciation and Amortization Cash Flows The cash flow add back for the noncash expense of depreciation and amortization. Desert Hills Premium Outlets, Cabazon (Palm Springs), CA Desert Hills Premium Outlets, Cabazon (Palm Springs), CA [Member] Represents information pertaining to Desert Hills Premium Outlets located at Cabazon (Palm Springs), CA. Destin, Florida [Member] Represents the information pertaining to Destin, Florida as a location. Destin, Florida Development Project [Member] Development projects Represents activity related to consolidated development projects. Development Projects [Member] Development Projects Represents information pertaining to Development Projects. Discontinued Operation Gain (Loss) from Discontinued Operation Acquisition of Controlling Interest Sale or Disposal of Assets and Interests in Unconsolidated Entities In a business combination achieved in stages, this element represents the amount of gain or loss recognized by the entity as a result of re-measuring to fair value the equity interest in the acquiree it held before the business combination. Also includes the difference between the carrying value and the sales price for consolidated investment property and equity method investments attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. Gain upon acquisition of controlling interests and sale or disposal of assets and interests in unconsolidated entities, net Discontinued Operation Income (Loss) from Discontinued Operation from Equity Method Investments This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. Income from unconsolidated entities Discontinued Operation Transaction Expenses of Discontinued Operation Net of Tax Discontinued operations transaction expenses Amount of transaction expenses after tax expense or benefit and not previously recognized, resulting from the sale of a business component. Discontinued operations transaction expenses Disposal Group Including Discontinued Operation Accounts Payable Accrued Expenses Intangibles and Deferred Revenues Accounts payable, accrued expenses, intangibles, and deferred revenues The summation of accounts payable, accrued expenses, intangibles, and deferred revenues attributable to disposal group, due within one year or within the normal operating cycle if longer. Disposal Group Including Discontinued Operation Accumulated Loss Related to Currency Transactions and Net Investment Hedge Accumulated Balance Accumulated losses related to currency translation and net investment hedge accumulated balances Represents accumulated losses related to currency translation and net investment hedge accumulated balances included in investment carrying value. Disposal Group Including Discontinued Operation Cash Distributions and Losses in Partnerships and Joint Ventures at Equity Cash distributions and losses in partnerships and joint ventures, at equity Cash distributions and losses in partnerships and joint ventures, at equity, attributable to disposal group. Disposal Group Including Discontinued Operation Cost of Property Repairs and Maintenance The aggregate costs of keeping the property in good condition but that do not appreciably prolong the life or increase the value of the property attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. Repairs and maintenance Disposal Group Including Discontinued Operation Debt Mortgages and unsecured indebtedness Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings and long-term debt attributable to disposal group. Disposal Group Including Discontinued Operation Debt Obligation Debt obligation related to consolidated properties disposed of Represents the debt obligation related to the consolidated properties which the entity had agreed to dispose off. Disposal Group Including Discontinued Operation Deferred Costs and Other Assets Deferred costs and other assets Aggregate carrying amount of deferred costs and other assets not separately disclosed attributable to disposal group. Disposal Group Including Discontinued Operation Direct Costs of Leased and Rented Property or Equipment Amount of expense incurred and directly related to generating revenue from leased and rented property or equipment attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. Property operating Disposal Group Including Discontinued Operation Equity Method Investments Investment in unconsolidated entities, at equity This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized attributable to disposal group. Disposal Group Including Discontinued Operation Marketing and Advertising Expense The total expense recognized in the period for promotion, public relations, and brand or product advertising attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. Advertising and promotion Net assets transferred to Washington Prime Net assets transferred to Washington Prime For the disposal group, including a component of the entity (discontinued operation), carrying amount as of the balance sheet date of net assets transferred. Disposal Group Including Discontinued Operation Net Assets Transferred Disposal Group Including Discontinued Operation Provision for Loan Lease and Other Losses The aggregate costs of keeping the property in good condition but that do not appreciably prolong the life or increase the value of the property attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. Provision for (recovery of) credit losses Disposal Group Including Discontinued Operation Real Estate Investment Property Accumulated Depreciation Less - accumulated depreciation The cumulative amount of depreciation for real estate property held for investment purposes attributable to disposal group. Less - accumulated depreciation Disposal Group Including Discontinued Operation Real Estate Investment Property at Cost Investment properties at cost Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments attributable to disposal group. Disposal Group Including Discontinued Operation Real Estate Investment Property Net Investment properties, net Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments attributable to disposal group. A tax based on the assessed value of real estate by the local government attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. Real estate taxes Disposal Group Including Discontinued Operation Real Estate Tax Expense Dissolved Joint Venture Partnership [Member] Dissolved Joint Venture Partnership Represents the dissolution of the joint venture partnership. Distribution Made to Member or Limited Partner Paid Total percentage of distributions paid Represents the sum of the percentages of distributions paid by taxable nature. Percent nontaxable as return of capital Represents the percentage of the distributions declared or paid during the period that are nontaxable as a return of capital. Distribution Made to Member or Limited Partner Percent Non Taxable as Return of Capital Distribution Made to Member or Limited Partner Percent Taxable as Long Term Capital Gains Percent taxable as long-term capital gains Represents the percentage of the distributions declared or paid during the period that are taxable as long-term capital gains. Distribution Made to Member or Limited Partner Percent Taxable as Ordinary Income Percent taxable as ordinary income Represents the percentage of the distributions declared or paid during the period that are taxable as ordinary income. Distribution Received from Proceeds of Financing in Joint Venture Amount of distribution received from proceeds of financing in joint venture Represents the amount of distribution received from proceeds of financing in the joint venture. The percentage of distributions paid on a unit of the Operating Partnership that participants of the stock-based compensation plan are entitled to receive during the performance period. Distributions Percentage to Operating Partnership Unit Percent of distributions of Operating Partnership that participants are entitled to receive during performance period Distributions from earnings to preferred unit holders. Partnership distributions Distributions to Preferred Unit Holders Financing Activities Document and Entity Information Domain, The Austin, TX [Member] Domain, The, Austin, TX Represents information pertaining to The Domain located at Austin, TX. Edinburgh Premium Outlets, Edinburgh (Indianapolis), IN Edinburgh Premium Outlets, Edinburgh (Indianapolis), IN [Member] Represents information pertaining to Edinburgh Premium Outlets located at Edinburgh (Indianapolis), IN. Edison Mall, Fort Myers, FL [Member] Represents information pertaining to Edison Mall located at Fort Myers, FL. Edison Mall, Fort Myers, FL Ellenton Premium Outlets, Ellenton (Tampa), FL [Member] Represents information pertaining to Ellenton Premium Outlets located at Ellenton (Tampa), FL. Ellenton Premium Outlets, Ellenton (Tampa), FL Empire East, Sioux Falls, SD [Member] Represents information pertaining to Empire East located at Sioux Falls, SD. Empire East, Sioux Falls, SD Empire Mall, Sioux Falls, SD [Member] Represents information pertaining to Empire Mall located at Sioux Falls, SD. Empire Mall, Sioux Falls, SD Employees [Member] Employees Represents information pertaining to the employees of the entity. Equipment and fixtures Represents the tangible personal property used to produce goods and services and equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities. Equipment and Fixture [Member] Additional noncontrolling interest purchased Represents the percentage of additional noncontrolling interest purchased in the investee accounted for under the equity method of accounting. Equity Method Investment Additional Ownership Percentage Equity Method Investment Amortization of Difference Between Carrying Amount and Underlying Equity Amortization of Excess Investment This item represents the amortization of the difference between the amount at which an investment accounted for under the equity method of accounting is carried on the balance sheet and the amount of underlying equity in net assets the reporting entity has in the investee. Our net Investment in Unconsolidated Entities, at equity This item represents the disclosure of the entity's net investment in investments accounted for using the equity method of accounting. Equity Method Investment Entity Ownership Investment Net Our Share of Net Income This item represents the amount of the entity's share of net income loss reported by the joint ventures in which the entity has an ownership interest. Equity Method Investment Entity Ownership Net Income Equity Method Investment Entity Ownership Partners Equity This item represents the disclosure of the entity's share of the partners' equity of the investment accounted for using the equity method investment. Partners' deficit Equity Method Investment, Excess Investment Life Life of joint ventures with excess investment The life, in years, over which the excess investment in equity method investments is amortized. Gain due to formation of joint venture Represents amount of gain loss due to formation of joint venture. Equity Method Investment Gain (Loss) Due to Formation of Joint Venture Number of shares owned in acquired entity Equity Method Investment, Number of Shares Owned Equity Method Investment Other than Temporary Impairment Share of Reporting Entity Impairment charge from investments in unconsolidated entities Represents the share of reporting entity to an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. Equity Method Investment Ownership Percentage Prior to Formation of Joint Venture Ownership interest prior to formation of joint venture (as a percent) The percentage of ownership of common stock or equity before formation of joint venture. Equity Method Investment Percentage Acquired Represents percentage of equity stake acquired. Equity stake percentage acquired Quoted market price of shares owned in acquired entity (in dollars per share) Equity Method Investment Quoted Market Price of Shares Owned Equity Method Investment Quoted Market Value Per Share Quoted market price per share (in dollars per share) Represents the quoted market price per share of an identified investment accounted for under the equity method of accounting for those investments in common stock for which a quoted market price is available. Add: Our Share of investment in discontinued unconsolidated entities, at equity Represents the entity's share of investment in discontinued unconsolidated entities. Equity Method Investment Share of Reporting Entity in Discontinued Unconsolidated Entities Summary of equity method investments and share of income from such investments, balance sheet Equity Method Investments Summarized Financial Information Balance Sheet [Table Text Block] Tabular disclosure of summarized balance sheet financial information for investments accounted for using the equity method of accounting. Equity Method Investments Summarized Financial Information Statement of Operations [Table Text Block] Tabular disclosure of summarized statement of operations information for investments accounted for using the equity method of accounting. Summary of equity method investments and share of income from such investments, statement of operations Equity Method Investment Summarized Financial Information Balance Sheet [Abstract] BALANCE SHEETS Equity Method Investment Summarized Financial Information Costs and Expenses [Abstract] Operating Expenses: The amount of equity method investments reported by an equity method investment of the entity. Equity Method Investment Summarized Financial Information Equity Method Investments Investment in unconsolidated entities, at equity Equity Method Investment Summarized Financial Information Operating Income (Loss) Operating income of Klepierre The amount of operating income (loss) reported by an equity method investment of the entity. Equity Method Investment Summarized Financial Information Ownership Interest [Abstract] Our Share of: Equity Method Investment Summarized Financial Information Rental Revenue Total revenues of Klepierre Revenue derived from the provision of short term lodging. Includes hotel rooms, cruise revenue, and other revenue related to lodgings reported by an equity method investment of the entity. Equity Method Investment Summarized Financial Information Revenue [Abstract] Revenue: This item represents the amount of third parties' share of net income loss reported by the joint ventures in which the entity has an ownership interest. Equity Method Investment Third Party Investors Share of Net Income Third-Party Investors' Share of Net Income Equity Method Investment Total Consideration for Disposal of Retail Galleries Represents the total consideration, including transfer duties for disposal of a portfolio of Carrefour-anchored retail galleries located in France, Spain and Italy by Klepierre. Total gross consideration Equity Method Investment Total Consideration for Disposal of Retail Galleries Entitys Share Group's share of total consideration Represents the Group's share of total consideration, including transfer duties for disposal of a portfolio of Carrefour-anchored retail galleries located in France, Spain and Italy by Kleipierre. Equity Method Joint Ventures [Member] Equity Method Investments Summarized financial information of the equity method joint venture investees. Exchange Ratio Number of Common Shares Received under Spin Off Transaction Exchange ratio of common shares for entity's stockholders to receive under spin off Represents the ratio applied to the number of common shares of the entity's stockholders to be received under the spin-off transaction, for example but not limited to, one share converted to two or two shares converted to one. Exchange Ratio Number of Units Received by Limited Partners in Operating Partnership Exchange ratio of common units for the entity's stockholders to receive under spin off Represents the ratio applied to the number of units to be received by limited partner of operating partnership under the spin-off transaction. Exchange Rights [Abstract] Exchange Rights Factory Stores of America-Lebanon, Lebanon, MO [Member] Represents information pertaining to Factory Stores of America - Lebanon located at Lebanon, MO. Factory Stores of America - Lebanon, Lebanon, MO Fair Value of Debt [Abstract] Fair value of debt Fashion Mall at Keystone, The, Indianapolis, IN [Member] Represents information pertaining to The Fashion Mall at Keystone located at Indianapolis, IN. Fashion Mall at Keystone, The, Indianapolis, IN Represents the amount of value allocated by a lessor (acquirer) to lease agreements which existed at the time of acquisition of a leased property, net of accumulated amortization. Such amount may include the value assigned to existing tenant relationships and excludes the market adjustment component of the value assigned for above or below-market leases acquired. Finite Lived Intangible Asset Acquired in Place Leases Net In-place lease intangibles, net Finite Lived Intangible Asset Off Market Lease Favorable Net Acquired above market lease intangibles, net This element represents the identifiable intangible asset based on a favorable difference between the terms of an acquired lease and the current market terms for that lease at the acquisition date, net of accumulated amortization. Firewheel Town Center, Garland (Dallas), TX [Member] Represents information pertaining to Firewheel Town Center located at Garland (Dallas), TX. Firewheel Town Center, Garland (Dallas), TX Fixed Rate Debt The carrying value of the amount of fixed rate debt outstanding at the balance sheet date. Carrying value of fixed-rate mortgages and unsecured indebtedness Carrying value of fixed-rate mortgages and other indebtedness Fixed Rate Debt [Abstract] Fixed-Rate Debt: Fair value of fixed-rate mortgages and other indebtedness The fair value of the amount of fixed rate debt outstanding at the balance sheet date. Fair value of fixed-rate mortgages and unsecured indebtedness Fixed Rate Debt Fair Value Florida Keys Outlet Center, Florida City, FL [Member] Represents information pertaining to Florida Keys Outlet Center located at Florida City, FL. Florida Keys Outlet Center, Florida City, FL Folsom Premium Outlets, Folsom (Sacramento), CA [Member] Represents information pertaining to Folsom Premium Outlets located at Folsom (Sacramento), CA. Folsom Premium Outlets, Folsom (Sacramento), CA Forest Mall, Fond Du Lac, WI [Member] Represents information pertaining to Forest Mall located at Fond Du Lac, WI. Forest Mall, Fond Du Lac, WI Forest Plaza, Rockford, IL [Member] Represents information pertaining to Forest Plaza located at Rockford, IL. Forest Plaza, Rockford, IL Forum Shops at Caesars, The, Las Vegas, NV [Member] Represents information pertaining to The Forum Shops at Caesars located at Las Vegas, NV. Forum Shops at Caesars, The, Las Vegas, NV Percentage of future minimum rentals receivable attributable to leases with an affiliate of a limited partner in the Operating Partnership Represents the percentage of the future minimum rental payments receivable under an operating lease, which are attributable to leases with an affiliate of one of our limited partners. Future Minimum Payments Receivable Attributable to Leases with Affiliate of Limited Partner in Operating Partnership Gaffney Premium Outlets, Gaffney, SC [Member] Represents information pertaining to Gaffney Premium Outlets located at Gaffney, SC. Gaffney Premium Outlets, Gaffney (Greenville/Charlotte), SC Gain upon acquisition of controlling interests and sale or disposal of assets and interests in unconsolidated entities, net Gain (loss) upon acquisition of controlling interests, sale or disposal of assets and interests in unconsolidated entities, and impairment charge on investment in unconsolidated entities, net The difference between the carrying value and the sales price for consolidated investment property and equity method investments. Gain (Loss) on Sale of Assets and Interests in Unconsolidated Entities The difference between the carrying value and the sales price for consolidated investment property and equity method investments, including discontinued operations. Gain upon acquisition of controlling interests and sale or disposal of assets and interests in unconsolidated entities, net Gain (Loss) on Sale of Assets and Interests in Unconsolidated Entities Including Discontinued Operations Gain (Loss) on Sale of Assets and Interests in Unconsolidated Entities Per Diluted Share Net gain (loss) upon acquisition of controlling interests, and on sale or disposal of assets and interests in unconsolidated entities, per diluted unit (in dollars per share) The difference between the carrying value and the sales price per diluted unit for consolidated investment property and equity method investments. Gallerie Commerciali Italia (GCI) joint venture in Europe in which the entity owns an interest. GCI Gallerie Commerciali Italia [Member] Gateway Centers, Austin, TX [Member] Represents information pertaining to Gateway Centers located at Austin, TX. Gateway Centers, Austin, TX Gilroy Premium Outlets, Gilroy (San Jose), CA [Member] Represents information pertaining to Gilroy Premium Outlets located at Gilroy (San Jose), CA. Gilroy Premium Outlets, Gilroy (San Jose), CA Grand Prairie and Livermore Premium Outlets [Member] Grand Prairie and Livermore properties Represents activity related to acquisition of interests in properties located in Grand Prairie, Texas and Livermore, California. Grand Prairie Premium Outlets Grand Prairie Dallas TX [Member] Represents the information pertaining to Grand Prairie Premium Outlets located at Grand Prairie (Dallas), TX. Grand Prairie Premium Outlets, Grand Prairie (Dallas), TX Grand Prairie Premium Outlets Grand Prairie TX [Member] Grand Prairie Premium Outlets, Grand Prairie (Dallas), TX Represents information pertaining to Grand Prairie Premium Outlets located at Grand Prairie (Dallas), TX. Grand Prairie Texas and Livermore California Outlets [Member] Grand Prairie, Texas and Livermore California outlets Represents the acquisition of previously consolidated outlet properties located in Grand Prairie, Texas and Livermore, California. Great Lakes Mall, Mentor (Cleveland), OH [Member] Represents information pertaining to Great Lakes Mall located at Mentor (Cleveland), OH. Great Lakes Mall, Mentor (Cleveland), OH Great Lakes Plaza, Mentor (Cleveland), OH [Member] Represents information pertaining to Great Lakes Plaza located at Mentor (Cleveland), OH. Great Lakes Plaza, Mentor (Cleveland), OH Great Mall Milpitas San Jose CA [Member] Represents the information pertaining to Great Mall located at Milpitas (San Jose), CA. Great Mall, Milpitas (San Jose), CA Greenwood Park Mall, Greenwood (Indianapolis), IN Greenwood Park Mall, Greenwood (Indianapolis), IN [Member] Represents information pertaining to Greenwood Park Mall located at Greenwood (Indianapolis), IN. Represents information pertaining to Greenwood Plus located at Greenwood (Indianapolis), IN. Greenwood Plus, Greenwood (Indianapolis), IN Greenwood Plus, Greenwood (Indianapolis), IN [Member] Ground [Member] Ground Represents development of property (Ground) subject to operating lease. Grove City Premium Outlets, Grove City, PA [Member] Represents information pertaining to Grove City Premium Outlets located at Grove City, PA. Grove City Premium Outlets, Grove City (Pittsburgh), PA Guarantee Obligations Recoverable Amount Loan guarantees recoverable Represents the amount recoverable by the guarantor from third parties for any of the amounts paid under the guarantee. Gulfport Premium Outlets, Gulfport, MS [Member] Represents information pertaining to Gulfport Premium Outlets located at Gulfport, MS. Gulfport Premium Outlets, Gulfport, MS Gulf View Square, Port Richey (Tampa), FL [Member] Represents information pertaining to Gulf View Square located at Port Richey (Tampa), FL. Gulf View Square, Port Richey (Tampa), FL Gurnee Mills Gurnee Chicago IL [Member] Represents the information pertaining to Gurnee Mills located at Gurnee (Chicago), IL. Gurnee Mills, Gurnee (Chicago), IL Hagerstown Premium Outlets, Hagerstown, MD [Member] Represents information pertaining to Hagerstown Premium Outlets located at Hagerstown, MD. Hagerstown Premium Outlets, Hagerstown (Baltimore/Washington DC), MD Haywood Mall, Greenville, SC [Member] Represents information pertaining to Haywood Mall located at Greenville, SC. Haywood Mall, Greenville, SC Henderson Square, King of Prussia (Philadelphia), PA [Member] Represents information pertaining to Henderson Square located at King of Prussia (Philadelphia), PA. Henderson Square, King of Prussia (Philadelphia), PA Highland Lakes Center, Orlando, FL [Member] Represents information pertaining to Highland Lakes Center located at Orlando, FL. Highland Lakes Center, Orlando, FL Home and Regional Office Costs Home and Regional Office Costs. Home and regional office costs Houston Galleria Texas [Member] Houston Galleria Represents the acquisition of Houston Galleria, located in Houston, Texas. Houston Premium Outlets, Cypress (Houston), TX [Member] Represents information pertaining to Houston Premium Outlets located at Cypress (Houston), TX. Houston Premium Outlets, Cypress (Houston), TX Huntley Outlet Center, Huntley, IL [Member] Represents information pertaining to Huntley Outlet Center located at Huntley, IL. Huntley Outlet Center, Huntley, IL HVAC equipment Represents the period of time over which the entity allocates the initial cost of its land and building to HAVC equipment. HVACE Equipment [Member] The charge against earnings resulting from the aggregate write down of all assets, except investment in unconsolidated entities, from their carrying value to their fair value. Impairment Charge Impairment charge Income (Loss) from Equity Method Investments Including Discontinued Operations This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee and discontinued operations. Equity in income of unconsolidated entities Provision for federal income taxes for REIT entities Represents the income tax expense (benefit) for real estate investment trust. Income Tax Expense Benefit for Real Estate Investment Trust Increase (decrease) Amortization to Rental Income [Abstract] Estimated future amortization, and the increasing (decreasing) effect on minimum rents Increase (decrease) Amortization toRental Income Next Twelve Months Represents the amount of increase (decrease) to rental revenue expected from leases in the next twelve months following the latest fiscal year ended. 2014 Increase (decrease) Amortization to Rental Income Year After Year Five Represents the amount of increase (decrease) to rental revenue expected from leases after the fifth fiscal year following the latest fiscal year. Thereafter Increase (decrease) Amortization to Rental Income Year Five Represents the amount of increase (decrease) to rental revenue expected from leases during the fifth fiscal year following the latest fiscal year. 2018 Increase (decrease) Amortization to Rental Income Year Four Represents the amount of increase (decrease) to rental revenue expected from leases during the fourth fiscal year following the latest fiscal year. 2017 Increase (decrease) Amortization to Rental Income Year Three Represents the amount of increase (decrease) to rental revenue expected from leases during the three fiscal year following the latest fiscal year. 2016 Increase (decrease) Amortization to Rental Income Year Two Represents the amount of increase (decrease) to rental revenue expected from leases during the second fiscal year following the latest fiscal year. 2015 The net change during the reporting period in accounts payable, accrued expenses, intangibles, deferred revenues and other liabilities. Accounts payable, accrued expenses, intangibles, deferred revenues and other liabilities Increase (Decrease) in Accounts Payable, Accrued Expenses, Intangibles Deferred Revenues and Other Liabilities Indebtedness and Derivative Financial Instruments Independence Center, Independence (Kansas City), MO [Member] Represents information pertaining to Independence Center located at Independence (Kansas City), MO. Independence Center, Independence (Kansas City), MO Ingram Park Mall, San Antonio, TX [Member] Represents information pertaining to Ingram Park Mall located at San Antonio, TX. Ingram Park Mall, San Antonio, TX Institutional Mall Investors Joint Venture [Member] IMI Joint Venture Represents the information of the equity method joint venture investee pertaining to Institutional Mall Investors. Institutional Mall Investors [Member] IMI Represents activity related to Institutional Mall Investors (IMI). Insurance coverage, acts of terrorism The amount of coverage per occurrence against acts of terrorism maintained by the entity. Insurance Coverage All Acts of Terrorism International Joint Venture Properties Number of International joint venture properties The number of properties owned via an International joint venture. Investment Land Building and Building Improvements Total land, buildings and improvements Aggregate of the carrying amounts as of the balance sheet date of investments in land, building and building improvements. Investment maturity period Investment Maturity Period Represents the maturity period of the investments held by the entity. Irving Mall, Irving (Dallas), TX [Member] Represents information pertaining to Irving Mall located at Irving (Dallas), TX. Irving Mall, Irving (Dallas), TX Issuance of Unit Equivalents Issuance of equivalents units Number of units issued of unit equivalents during the reporting period. This element represents issuance of unit equivalents and stockholders equity other during the reporting period. Issuance of Unit Equivalents and Stockholders Equity Other Issuance of unit equivalents and other (489,654 and 337,006 units for the years ended 2013 and 2012 and 1,133,673 and 6,857 units for the year ended 2011) Issuance of Units Partners Capital Other Issuance of other units Number of units issued of partner capital other during the reporting period. Jackson Premium Outlets, Jackson (New York), NJ [Member] Represents information pertaining to Jackson Premium Outlets located at Jackson (New York), NJ. Jackson Premium Outlets, Jackson (New York), NJ Jefferson Valley Mall, Yorktown Heights (New York), NY [Member] Represents information pertaining to Jefferson Valley Mall located at Yorktown Heights (New York), NY. Jefferson Valley Mall, Yorktown Heights (New York), NY Jersey Shore Premium Outlets, Tinton Falls (New York), NJ [Member] Represents information pertaining to Jersey Shore Premium Outlets located at Tinton Falls (New York), NJ. Jersey Shore Premium Outlets, Tinton Falls (New York), NJ Johnson Creek Premium Outlets, Johnson Creek, WI [Member] Represents information pertaining to Johnson Creek Premium Outlets located at Johnson Creek, WI. Johnson Creek Premium Outlets, Johnson Creek, WI Joint Venture Debt Obligations Repaid Debt obligation related to consolidated properties disposed of Joint venture debt obligations repaid during period. The number of properties owned via a joint venture in which daily operations are managed by groups other than the entity. Joint Venture Properties Managed by Others Number of joint venture properties managed by others Joint Venture Properties Managed, Number Number of joint venture properties managed by the entity The number of properties owned via a joint venture in which daily operations are managed by the entity. Joint Venture Properties, Number Total number of joint venture properties The number of properties owned via a joint venture and accounted for using the equity method of accounting. Keystone Shoppes, Indianapolis, IN [Member] Represents information pertaining to Keystone Shoppes located at Indianapolis, IN. Keystone Shoppes, Indianapolis, IN King of Prussia Mall, King of Prussia Philadelphia, PA [Member] King of Prussia Mall, King of Prussia (Philadelphia), PA Represents information pertaining to King of Prussia Mall located at King of Prussia (Philadelphia), PA. King of Prussia [Member] King of Prussia Represents information pertaining to the King of Prussia acquisition. King of Prussia-The Court & The Plaza, King of Prussia (Philadelphia), PA [Member] Represents information pertaining to King of Prussia - The Court & The Plaza located at King of Prussia (Philadelphia), PA. King of Prussia - The Court & The Plaza, King of Prussia (Philadelphia), PA Kittery Premium Outlets, Kittery, ME [Member] Represents information pertaining to Kittery Premium Outlets located at Kittery, ME. Kittery Premium Outlets, Kittery, ME Klepierre [Member] Represents activity related to Klepierre. Klepierre Knoxville Center, Knoxville, TN [Member] Represents information pertaining to Knoxville Center located at Knoxville, TN. Knoxville Center, Knoxville, TN Laguna Hills Mall, Laguna Hills (Los Angeles), CA [Member] Represents information pertaining to Laguna Hills Mall located at Laguna Hills (Los Angeles), CA. Laguna Hills Mall, Laguna Hills (Los Angeles), CA Lakeline Mall, Cedar Park (Austin), TX [Member] Represents information pertaining to Lakeline Mall located at Cedar Park (Austin), TX. Lakeline Mall, Cedar Park (Austin), TX Lakeline Plaza, Cedar Park (Austin), TX [Member] Represents information pertaining to Lakeline Plaza located at Cedar Park (Austin), TX. Lakeline Plaza, Cedar Park (Austin), TX Lake Plaza, Waukegan (Chicago), IL [Member] Represents information pertaining to Lake Plaza located at Waukegan (Chicago), IL. Lake Plaza, Waukegan (Chicago), IL Lake View Plaza, Orland Park (Chicago), IL [Member] Represents information pertaining to Lake View Plaza located at Orland Park (Chicago), IL. Lake View Plaza, Orland Park (Chicago), IL Represents the period of time over which the entity allocates the initial cost of its land and building to landscaping and parking. Landscaping and Parking Lot [Member] Landscaping and parking lot La Plaza Mall, McAllen, TX [Member] Represents information pertaining to La Plaza Mall located at McAllen, TX. La Plaza Mall, McAllen, TX Las Americas Premium Outlets, San Diego, CA [Member] Represents information pertaining to Las Americas Premium Outlets located at San Diego, CA. Las Americas Premium Outlets, San Diego, CA Las Vegas Premium Outlets-North, Las Vegas, NV [Member] Represents information pertaining to Las Vegas Premium Outlets - North located at Las Vegas, NV. Las Vegas Premium Outlets - North, Las Vegas, NV Las Vegas Premium Outlets-South, Las Vegas, NV [Member] Represents information pertaining to Las Vegas Premium Outlets - South located at Las Vegas, NV. Las Vegas Premium Outlets - South, Las Vegas, NV Lebanon Premium Outlets, Lebanon (Nashville), TN [Member] Represents information pertaining to Lebanon Premium Outlets located at Lebanon (Nashville), TN. Lebanon Premium Outlets, Lebanon (Nashville), TN Lee Premium Outlets, Lee, MA [Member] Represents information pertaining to Lee Premium Outlets located at Lee, MA. Lee Premium Outlets, Lee, MA Leesburg Corner Premium Outlets, Leesburg (Washington D.C.), VA [Member] Represents information pertaining to Leesburg Corner Premium Outlets located at Leesburg (Washington D.C.), VA. Leesburg Corner Premium Outlets, Leesburg (Washington D.C.), VA Lenox Square, Atlanta, GA [Member] Represents information pertaining to Lenox Square located at Atlanta, GA. Lenox Square, Atlanta, GA Less Than Wholly Owned Properties [Member] Less than wholly owned properties Represents the threshold percentage of ownership below which a property is not considered wholly owned but is consolidated in the financial statements of the parent entity on the basis of control. Liberty Village Premium Outlets, Flemington (New York), NJ [Member] Represents information pertaining to Liberty Village Premium Outlets located at Flemington (New York), NJ. Liberty Village Premium Outlets, Flemington (New York), NJ Lighthouse Place Premium Outlets, Michigan City, IN [Member] Represents information pertaining to Lighthouse Place Premium Outlets located at Michigan City, IN. Lighthouse Place Premium Outlets, Michigan City (Chicago, IL), IN Lima Center, Lima, OH [Member] Represents information pertaining to Lima Center located at Lima, OH. Lima Center, Lima, OH Lima Mall, Lima, OH Lima Mall, Lima, OH [Member] Represents information pertaining to Lima Mall located at Lima, OH. Limited Life Partnerships [Abstract] Limited Life Partnerships Approximate settlement values of noncontrolling interest This element represents the approximate settlement values of noncontrolling interest in limited life partnerships. Limited Partnership Approximate Settlement Values Noncontrolling Interest Limited Partnership Units Issued During Period Units Issuance of limited partner, units The number of limited partner units issued during the reporting period. Limited Partnership Units Issued During Period Units Conversion of Preferred Units Preferred units converted to limited partner common units The number of limited partner units resulting from conversion of preferred units during the reporting period. Limited Partnership Units Issued During Period Value Issuance of limited partner units (205,335 and 75,469 units for the years ended 2012 and 2011) This element represents value of limited partner units issued during the period. Issuance of limited partner units The value of limited partner units issued during the period related to the conversion of Preferred Units to Limited Partner Units. Limited partner units exchanged to common units (596,051, 7,447,921, and 584,432 units for the years ended 2013, 2012 and 2011 and 6,795,296 common shares for the year ended 2012) Limited partner units exchanged to units Limited Partnership Units Issued During Period Value, Conversion of Preferred Units Limited partners' preferred interest in the Operating Partnership Limited Partners Preferred Interest in Operating Partnership Represents the limited partners' preferred interest in an operating partnership. Preferred units, at liquidation value, and noncontrolling redeemable interests in properties Limited Partners Preferred Interest in Operating Partnership and Noncontrolling Redeemable Interests in Properties Represents the Limited Partners' Preferred Interest in Operating Partnership and Noncontrolling Redeemable Interests in Properties. Limited partners' preferred interest in the Operating Partnership and other noncontrolling redeemable interests in properties Represents information pertaining to Lincoln Crossing located at O'Fallon (St. Louis), IL. Lincoln Crossing, O'Fallon (St. Louis), IL Lincoln Crossing, O'Fallon (St. Louis), IL [Member] Lincoln Plaza, King of Prussia (Philadelphia), PA [Member] Represents information pertaining to Lincoln Plaza located at King of Prussia (Philadelphia), PA. Lincoln Plaza, King of Prussia (Philadelphia), PA Lincolnwood Town Center, Lincolnwood (Chicago), IL [Member] Represents information pertaining to Lincolnwood Town Center located at Lincolnwood (Chicago), IL. Lincolnwood Town Center, Lincolnwood (Chicago), IL Lindale Mall, Cedar Rapids, IA [Member] Represents information pertaining to Lindale Mall located at Cedar Rapids, IA. Lindale Mall, Cedar Rapids, IA Line of Credit, Additional Basis Spread on Variable Rate Additional facility fee (as a percent) The number of additional percentage points added to the reference rate as a facility fee on the line of credit. Line of Credit Facility Currency Percentage Percentage of borrowings in currencies other than the U.S. Dollar Represents the percentage of other than borrowings in the currency of the country of domicile, identification of the currency in which borrowings are made. Line of Credit Facility Maximum Borrowing Capacity Expanded Maximum borrowing capacity Maximum borrowing capacity to which the credit facility may be expanded per the terms of the agreement of the reporting entity. Maximum borrowing capacity to which the credit facility may be expanded per the terms of the agreement, at the option of the reporting entity. Line of Credit Facility, Maximum Borrowing Capacity Optional Expanded Optional expanded maximum borrowing capacity Line of Credit, Facility Multi Currency Tranche Represents the multi-currency tranche included under the credit facility. Multi-currency tranche Number of credit facilities Line of Credit Facility, Number Represents the number of credit facilities available to the entity. Livermore Premium Outlets Livermore CA [Member] Livermore Premium Outlets, Livermore (San Francisco), CA Represents information pertaining to Livermore Premium Outlets located at Livermore (San Francisco), CA. Livermore Premium Outlets Livermore San Francisco CA [Member] Represents the information pertaining to Livermore Premium Outlets located at Livermore (San Francisco), CA. Livermore Premium Outlets, Livermore (San Francisco), CA Livingston Mall, Livingston (New York), NJ [Member] Represents information pertaining to Livingston Mall located at Livingston (New York), NJ. Livingston Mall, Livingston (New York), NJ Loans Held For Investment [Abstract] Loans Held for Investment Loans Held For Investment [Policy Text Block] Loans Held for Investment Describes an entity's accounting policies for investments in mortgage loans or mezzanine loans. Loan To SPG-FCM Loans to SPG-FCM Item List [Abstract] Long Term Incentive Performance Program 2011 [Member] 2011-2013 LTIP Program The 2011 Long-Term Incentive Performance Program. 2012-2014 LTIP Program The 2012 Long-Term Incentive Performance Program. Long Term Incentive Performance Program 2012 [Member] Long term Incentive Performance Program 2013 [Member] 2013-2015 LTIP program Represents the 2013 Long-Term Incentive Performance Program. Long Term Incentive Performance Program 2014 [Member] 2014-2016 LTIP Program Represents the 2014 Long-Term Incentive Performance Program. Long Term Incentive Performance Program One Year [Member] One-year 2010 LTIP Program The Long-Term Incentive Performance Program which has a one-year performance period. Long Term Incentive Performance Programs [Member] LTIP programs Represents the long-term incentive performance programs. Long Term Incentive Performance Program Three Year [Member] Three-year 2010 LTIP Program The Long-Term Incentive Performance Program which has a three-year performance period. Long Term Incentive Performance Program Two Year [Member] Two-year 2010 LTIP Program The Long-Term Incentive Performance Program which has a two-year performance period. Longview Mall, Longview, TX [Member] Represents information pertaining to Longview Mall located at Longview, TX. Longview Mall, Longview, TX LTIP Retention Award Chairman and CEO [Member] LTIP Retention Award to Chairman and CEO The one-time retention award issued to the chairman and CEO in the form of LTIP units. Shares or units of category 'A' awarded to the chairman and CEO for meeting certain performance targets. A Units LTIP Retention Award Chairman and CEO Member Performance A Units [Member] Shares or units of category 'B' awarded to the chairman and CEO for meeting certain performance targets. B Units LTIP Retention Award Chairman and CEO Member Performance B Units [Member] LTIP Retention Award Chairman and CEO Member Performance C Units [Member] C Units Shares or units of category 'C' awarded to the chairman and CEO for meeting certain performance targets. MacGregor Village, Cary, NC [Member] Represents information pertaining to MacGregor Village located at Cary, NC. MacGregor Village, Cary, NC Mall at Chestnut Hill, The, Chestnut Hill (Boston), MA [Member] Represents information pertaining to Mall at Chestnut Hill, The located at Chestnut Hill (Boston), MA. Mall at Chestnut Hill, The, Chestnut Hill (Boston), MA Mall [Member] Mall Represents activity related to mall properties. Mall of Georgia, Buford (Atlanta), GA [Member] Represents information pertaining to Mall of Georgia located at Buford (Atlanta), GA. Mall of Georgia, Buford (Atlanta), GA Mall of Georgia Crossing, Buford (Atlanta), GA [Member] Represents information pertaining to Mall of Georgia Crossing located at Buford (Atlanta), GA. Mall of Georgia Crossing, Buford (Atlanta), GA Malls [Member] Malls Represents information pertaining to Malls. Previous unconsolidated mall Management fees and other revenues Management Fees and Other Revenues Revenue, comprised of base and incentive revenue, from operating and managing another entity's business during the reporting period; plus revenues not otherwise specified. Management Fees and Other Revenues [Abstract] Management fees and other revenues Maplewood Mall, St. Paul (Minneapolis), MN [Member] Represents information pertaining to Maplewood Mall located at St. Paul (Minneapolis), MN. Maplewood Mall, St. Paul (Minneapolis), MN Markland Mall, Kokomo, IN [Member] Represents information pertaining to Markland Mall located at Kokomo, IN. Markland Mall, Kokomo, IN Markland Plaza, Kokomo, IN [Member] Represents information pertaining to Markland Plaza located at Kokomo, IN. Markland Plaza, Kokomo, IN Martinsville Plaza, Martinsville, VA [Member] Represents information pertaining to Martinsville Plaza located at Martinsville, VA. Martinsville Plaza, Martinsville, VA Matteson Plaza, Matteson (Chicago), IL [Member] Represents information pertaining to Matteson Plaza located at Matteson (Chicago), IL. Matteson Plaza, Matteson (Chicago), IL Maximum period of measurement during which allocation of investment is subject to revision Represents the maximum period of measurement from the acquisition date during which allocation of investment is subject to revision. Maximum Measurement Period During which Allocation of Investment is Subject to Revision McArthurGlen Group Represents information pertaining to McArthurGlen Group, Europe's leading owner, developer and manager of designer outlets. McArthurGlen Group [Member] McCain Mall, N. Little Rock, AR [Member] Represents information pertaining to McCain Mall located at N. Little Rock, AR. McCain Mall, N. Little Rock, AR Melbourne Square, Melbourne, FL [Member] Represents information pertaining to Melbourne Square located at Melbourne, FL. Melbourne Square, Melbourne, FL Melvin Simon and Associates Inc [Member] Unconsolidated joint ventures Represents information pertaining to transactions with Melvin Simon & Associates, Inc. Menlo Park Mall, Edison (New York), NJ [Member] Represents information pertaining to Menlo Park Mall located at Edison (New York), NJ. Menlo Park Mall, Edison (New York), NJ Merrimack Premium Outlets [Member] Represents information pertaining to Merrimack Premium Outlets. Merrimack Premium Outlets, Merrimack, NH Mesa Mall, Grand Junction, CO [Member] Represents information pertaining to Mesa Mall located at Grand Junction, CO. Mesa Mall, Grand Junction, CO Midland Park Mall, Midland, TX [Member] Represents information pertaining to Midland Park Mall located at Midland, TX. Midland Park Mall, Midland, TX Miller Hill Mall, Duluth, MN [Member] Represents information pertaining to Miller Hill Mall located at Duluth, MN. Miller Hill Mall, Duluth, MN Mills transaction properties Represents activity related to the Mills transaction. Mills Transaction Properties [Member] Minimum Insurance, Coverage by Single Insurance Provider Represents the amount of minimum insurance coverage provided by single insurance provider. Minimum insurance coverage Minority Interest and Temporary Equity [Line Items] Schedule of Noncontrolling interest and temporary equity. Ownership interest Minority Interest and Temporary Equity [Table] Schedule of noncontrolling interest and temporary equity. Mitsubishi Estate Co Ltd [Member] Mitsubishi Estate Co., Ltd. Represents information pertaining to the Mitsubishi Estate Co., Ltd. Montgomery Mall, North Wales (Philadelphia), PA [Member] Represents information pertaining to Montgomery Mall located at North Wales (Philadelphia), PA. Montgomery Mall, North Wales (Philadelphia), PA Mortgage Loans on Real Estate Held For Investment, Number of Loans Number of mortgage and mezzanine loans secured by real estate repaid during the year The number of loans on real estate, both mortgage and mezzanine, that are held for investment. Mortgage Loans on Real Estate Interest Income Interest income on loans held for investment Represents the interest income on the mortgage loan receivable. Mortgages Maturing 17 December 2017 [Member] Mortgages maturing December 11, 2017 Represents information pertaining to mortgages maturing December 11, 2017. Mortgages Maturing 1 December 2020 [Member] Mortgages maturing December 01, 2020 Represents information pertaining to mortgages maturing December 01, 2020. Movement in Minority Interest Roll Forward [Table Text Block] Schedule of rollforward of noncontrolling interests Tabular schedule disclosing a roll forward of noncontrolling interests. Muncie Mall, Muncie, IN [Member] Represents information pertaining to Muncie Mall located at Muncie, IN. Muncie Mall, Muncie, IN Muncie Towne Plaza, Muncie, IN [Member] Represents information pertaining to Muncie Towne Plaza located at Muncie, IN. Muncie Towne Plaza, Muncie, IN Napa Premium Outlets, Napa, CA [Member] Represents information pertaining to Napa Premium Outlets located at Napa, CA. Napa Premium Outlets, Napa, CA Naples Outlet Center, Naples, FL [Member] Represents information pertaining to Naples Outlet Center located at Naples, FL. Naples Outlet Center, Naples, FL Net income, attributable to preferred distributions on temporary equity preferred units (in dollars) This element represents net income attributable to preferred distributions on temporary equity preferred units during the reporting period. Net Income (Loss) Attributable to Preferred Distributions on Temporary Equity Preferred Units Net Income (Loss) Excluding Preferred Distributions on Temporary Equity Preferred Units Net income, excluding preferred distributions on temporary equity preferred units of $1,915, $1,915 and $1,915 for the years ended 2013, 2012 and 2011 and $8,858, $8,520 and $8,946 attributable to noncontrolling redeemable interests in properties in temporary equity for the years ended 2013, 2012 and 2011 This element represents net income (loss), excluding the amount attributable to preferred interests in operating partnership during the reporting period. New Castle Plaza, New Castle, IN [Member] Represents information pertaining to New Castle Plaza located at New Castle, IN. New Castle Plaza, New Castle, IN Noncontrolling Interest Preferred Return Percentage Preferred partnership units preferred return (as a percent) Represents the percentage of preferred return on preferred partnership units of noncontrolling interests. Noncontrolling Interests and Temporary Equity [Policy Text Block] Noncontrolling Interests and Temporary Equity Describes the accounting policy for noncontrolling interests and temporary equity. Noncontrolling Interests [Policy Text Block] Noncontrolling Interests Disclosure of accounting policy for noncontrolling interests. Noncontrolling interests redeemable at amounts in excess of fair value Noncontrolling Interests Redeemable at Amount in Excess of Fair Value Represents the noncontrolling interests that are redeemable at amounts in excess of fair value. Noncontrolling Interests [Roll Forward] Noncontrolling Interests: Noncontrolling Redeemable Interests in Properties Represents the limited partners' interests in noncontrolling redeemable properties. Noncontrolling redeemable interests in properties Other noncontrolling redeemable interests in properties Non Employee Directors [Member] Non-employee Directors Represents information pertaining to the non-employee directors of the entity. North Bend Premium Outlets, North Bend (Seattle), WA [Member] Represents information pertaining to North Bend Premium Outlets located at North Bend (Seattle), WA. North Bend Premium Outlets, North Bend (Seattle), WA North East Mall, Hurst (Dallas), TX [Member] Represents information pertaining to North East Mall located at Hurst (Dallas), TX. North East Mall, Hurst (Dallas), TX Northfield Square, Bourbonnais, IL [Member] Represents information pertaining to Northfield Square located at Bourbonnais, IL. Northfield Square, Bourbonnais, IL Northgate Mall, Seattle, WA [Member] Represents information pertaining to Northgate Mall located at Seattle, WA. Northgate Mall, Seattle, WA North Georgia Premium Outlets, Dawsonville (Atlanta), GA [Member] Represents information pertaining to North Georgia Premium Outlets located at Dawsonville (Atlanta), GA. North Georgia Premium Outlets, Dawsonville (Atlanta), GA Northlake Mall, Atlanta, GA [Member] Represents information pertaining to Northlake Mall located at Atlanta, GA. Northlake Mall, Atlanta, GA North Ridge Plaza, Joliet (Chicago), IL [Member] Represents information pertaining to North Ridge Plaza located at Joliet (Chicago), IL. North Ridge Plaza, Joliet (Chicago), IL North Ridge Shopping Center, Raleigh, NC [Member] Represents information pertaining to North Ridge Shopping Center located at Raleigh, NC. North Ridge Shopping Center, Raleigh, NC Northwood Plaza, Fort Wayne, IN [Member] Represents information pertaining to Northwood Plaza located at Fort Wayne, IN. Northwood Plaza, Fort Wayne, IN Northwoods Mall, Peoria, IL [Member] Represents information pertaining to Northwoods Mall located at Peoria, IL. Northwoods Mall, Peoria, IL Number of Common Stock Shares Held Considered for Receiving Common Shares Under Spin Off Transaction Represents the number of shares held, which are considered for receiving common shares under spin-off transaction. Number of shares of common stock held considered for receiving Washington Prime common share Number of Consolidated Properties Received in Distribution Number of consolidated properties received in distribution Represents the consolidated number of properties received due to dissolution of joint venture. Number of cross-defaulted and cross-collateralized mortgage pools Number of pools of cross-defaulted and cross-collateralized mortgages encumbering the entity's properties. Number of Cross Defaulted and Cross Collateralized Mortgage Pools with Collateral Properties Number of Development Projects Number of development projects Represents the number of development projects. Number of joint venture interests sold The number of joint venture interests sold. Number of Joint Venture Interests Sold Number of Joint Ventures in which to Invest Number of joint ventures to invest in per definitive agreement Represents the number of joint ventures in which the entity is to invest in. Number of Limited Partners Issued Shares of Common Stock Number of limited partners who received common stock The number of limited partners who received common stock in exchange for an equal number of units, in the period. Number of Long Term Incentive Programs Approved Represents the number of long term incentive programs approved. Number of programs approved Number of Luxury Outlets Owned and Operated Number of luxury outlets owned and operated Represents the number of luxury outlets owned and operated. Represents the number of mortgaged properties, which were released on subsequent repayment of debt. Number of Mortgaged Properties Released on Repayment of Debt Number of unencumbered properties on repayment of debt Number of One Year Extensions Available Number of one-year extension options available Represents the number of one-year extensions available under the commitment. Number of Outlets in which Entity has Minority Direct Ownership Number of outlets in which the entity has a minority direct ownership Represents the number of outlets in which the entity has a minority direct ownership. Number of Partners Interest Acquired The number of partner's interest acquired. Number of partner's interest acquired Number of Properties Cross Defaulted and Cross Collateralized Mortgages Total Total number of properties pledged as collateral for cross defaulted and cross collateralized mortgages The total number of properties pledged as collateral for cross defaulted and cross collateralized mortgages. Number of consolidated properties sold Number of properties disposed Number of Properties Disposed Represents the number of properties that are disposed during the period by the entity. Number of Properties in which Additional Interest Acquired Remaining Unconsolidated Number of remaining unconsolidated properties Represents the number of properties remaining unconsolidated in which additional interest is acquired. Number of Properties Previously Unencumbered Represents the number of properties previously unencumbered which are expected to part of the Washington Prime portfolio. Number of properties previously unencumbered expected to be part of the Washington Prime portfolio Number of properties in which interest is acquired Number of properties contained in a portfolio Number of Real Estate Properties Acquired Number of properties in which interest is acquired Number of outlets in which interest acquired Represents the number of outlets in which interest was acquired by the entity. Number of Real Estate Properties Disposed Number of properties disposed of during the period This element represents the number of real estate properties that were disposed of during the period. Number of retail galleries disposed Number of properties merged under spin off into publicly traded REIT (Washington Prime Group Inc.) Represents the number of properties merged under spin off into publicly traded real estate investment trust. Number of Real Estate Properties Merged Under Spin Off Number of unconsolidated properties in the spin-off of Washington Prime Number of Real Estate Properties Sold Number of properties sold The number of real estate properties sold. Number of Series of Units Classified into Temporary Equity The number of series of preferred units classified in temporary equity. Number of Series of Units Classified Into Temporary Equity Number of Unconsolidated Properties Now Consolidated Number of unconsolidated properties now consolidated Represents number of unconsolidated properties now consolidated. Oak Court Mall, Memphis, TN [Member] Represents information pertaining to Oak Court Mall located at Memphis, TN. Oak Court Mall, Memphis, TN Ocean County Mall, Toms River (New York), NJ [Member] Represents information pertaining to Ocean County Mall located at Toms River (New York), NJ. Ocean County Mall, Toms River (New York), NJ Office Properties Boston MA [Member] Office property, Boston, Massachusetts Represents information pertaining to office properties in located in Boston, MA. Operating partnership capital account, amount Represents the amount of units issued by the Operating Partnership. Operating Partnership Capital Account Amount Operating Partnership Capital Account Units Issued Operating partnership capital account, units issued Represents the number of units issued by the Operating Partnership. Represents the redemption price per unit of the operating partnership. Operating Partnership, Redemption Price Per Unit Operating Partnership, redemption price per unit Opry Mills Nashville TN [Member] Represents the information pertaining to Opry Mills located at Nashville, TN. Opry Mills, Nashville, TN Orange Park Mall, Orange Park (Jacksonville), FL [Member] Represents information pertaining to Orange Park Mall located at Orange Park (Jacksonville), FL. Orange Park Mall, Orange Park (Jacksonville), FL Organization Orlando Premium Outlets-International Dr, Orlando, FL [Member] Represents information pertaining to Orlando Premium Outlets - International Dr located at Orlando, FL. Orlando Premium Outlets - International Dr, Orlando, FL Orlando Premium Outlets-Vineland Ave, Orlando, FL [Member] Represents information pertaining to Orlando Premium Outlets - Vineland Ave located at Orlando, FL. Orlando Premium Outlets - Vineland Ave, Orlando, FL Orland Square, Orland Park (Chicago), IL [Member] Represents information pertaining to Orland Square located at Orland Park (Chicago), IL. Orland Square, Orland Park (Chicago), IL Osage Beach Premium Outlets, Osage Beach, MO [Member] Represents information pertaining to Osage Beach Premium Outlets located at Osage Beach, MO. Osage Beach Premium Outlets, Osage Beach, MO Other Marketable Securities and Cost Method Investments Other marketable and non-marketable securities Represents the aggregate carrying amount of all cost-method investments as reported on or included in the balance sheet and other marketable securities which are not separately disclosed or provided for elsewhere in the taxonomy. Other pre-development costs [Member] Represents information pertaining to Other pre-development costs. Other pre-development costs Other Real Estate Properties [Member] Other Represents information pertaining to Other Real Estate Properties. Other Related Parties [Member] Properties owned by related parties Represents information pertaining to transactions with related parties other than unconsolidated joint ventures. Other Shopping Centers or Outlet Centers [Member] Other shopping centers or outlet centers Represents information pertaining to Other Shopping Centers or Outlet Centers. Outlet center, Destin, FL Represents information pertaining to an outlet center in Destin, Florida. Outlet Center Destin Florida [Member] Outlet Center [Member] Outlet center Represents information pertaining to outlet center. Outlet Center Portland Oregon [Member] Outlet center, Portland OR Represents information pertaining to an outlet center near Portland, Oregon. Outlet Marketplace, Orlando, FL [Member] Represents information pertaining to Outlet Marketplace located at Orlando, FL. Outlet Marketplace, Orlando, FL Ownership Interest Item List [Abstract] Ownership interest: Oxford Valley Mall, Langhorne (Philadelphia), PA [Member] Represents information pertaining to Oxford Valley Mall located at Langhorne (Philadelphia), PA. Oxford Valley Mall, Langhorne (Philadelphia), PA Paddock Mall, Ocala, FL [Member] Represents information pertaining to Paddock Mall located at Ocala, FL. Paddock Mall, Ocala, FL Palms Crossing, McAllen, TX [Member] Represents information pertaining to Palms Crossing located at McAllen, TX. Palms Crossing, McAllen, TX Partners Capital Account Units Exchange Ratio Describes the exchange ratio of limited partners units. Limited partners units, exchange ratio Partners Capital Contribution Excess Premium Premium received on preferred stock issued Represents the amount of the premium received on the issuance of preferred units at the issuance date. Partnership agreement Partnership Agreement [Member] Represents information about the partnership agreement of Operating Partnership. Payment of Cash to be Retained by Subsidiary Cash impact of Washington Prime spin-off Represents the cash outflow associated with cash to be retained by subsidiary during the period. Payments for Purchase of Noncontrolling Interest in Consolidated Properties Purchase of noncontrolling interest in consolidated properties The cash outflow associated with purchase of noncontrolling interest in consolidated properties. Represents the cash outflow for redemption of limited partner units. Payments for Redemption of Limited Partner Units Redemption of limited partner units Penn Square Mall, Oklahoma City, OK [Member] Represents information pertaining to Penn Square Mall located at Oklahoma City, OK. Penn Square Mall, Oklahoma City, OK Percentage of Consideration Paid in Cash Percentage of consideration paid in cash Represents the percentage of consideration paid in cash. Percentage of Consideration Paid in Units Percentage of consideration paid in units Represents the percentage of consideration paid in units. Petaluma Village Premium Outlets, Petaluma, CA [Member] Represents information pertaining to Petaluma Village Premium Outlets located at Petaluma, CA. Petaluma Village Premium Outlets, Petaluma (San Francisco), CA Pheasant Lane Mall, Nashua, NH [Member] Represents information pertaining to Pheasant Lane Mall located at Nashua, NH. Pheasant Lane Mall, Nashua, NH Philadelphia Premium Outlets, Limerick (Philadelphia), PA [Member] Represents information pertaining to Philadelphia Premium Outlets located at Limerick (Philadelphia), PA. Philadelphia Premium Outlets, Limerick (Philadelphia), PA Phipps Plaza, Atlanta, GA [Member] Represents information pertaining to Phipps Plaza located at Atlanta, GA. Phipps Plaza, Atlanta, GA Phoenix Premium Outlet Chandler Phoenix AZ [Member] Represents the information pertaining to Phoenix Premium Outlet located at Chandler (Phoenix), AZ. Phoenix Premium Outlet, Chandler (Phoenix), AZ Phoenix Premium Outlets, Chandler Phoenix, AZ [Member] Phoenix Premium Outlets, Chandler (Phoenix), AZ Represents information pertaining to Phoenix Premium Outlets located at Chandler (Phoenix), AZ. Pismo Beach Premium Outlets, Pismo Beach, CA [Member] Represents information pertaining to Pismo Beach Premium Outlets located at Pismo Beach, CA. Pismo Beach Premium Outlets, Pismo Beach, CA Plaza Carolina, Carolina (San Juan), PR [Member] Represents information pertaining to Plaza Carolina located at Carolina (San Juan), PR. Plaza Carolina, Carolina (San Juan), PR Pleasant Prairie Premium Outlets, Pleasant Prairie, WI [Member] Represents information pertaining to Pleasant Prairie Premium Outlets located at Pleasant Prairie, WI. Pleasant Prairie Premium Outlets, Pleasant Prairie (Chicago, IL/Milwaukee), WI Port Charlotte Town Center, Port Charlotte, FL [Member] Represents information pertaining to Port Charlotte Town Center located at Port Charlotte, FL. Port Charlotte Town Center, Port Charlotte, FL Portfolio of ten properties Represents information related to portfolio of ten properties. Portfolio of Ten Properties [Member] Portland Oregon [Member] Portland, Oregon Represents information pertaining to Portland, Oregon as a location. Potomac Mills Woodbridge Washington DCVA [Member] Represents the information pertaining to Potomac Mills located at Woodbridge (Washington, D.C.), VA. Potomac Mills, Woodbridge (Washington, D.C.), VA Preferred Stock Premium Amortization Series J preferred stock premium and amortization The sum of the periodic adjustments of the differences between Preferred Stock's face value and purchase prices that are charged against earnings. This is called amortization if the Preferred Stock was purchased at premium. Preferred Stock Unamortized Premium Preferred stock unamortized premium The amount of preferred stock premium that was originally recognized at the issuance of stock that has yet to be amortized and included in carrying value of preferred stock. Preferred Units Converted to Common Units Series I preferred units The number of preferred units converted to common units during the reporting period. Preferred Units Converted to Limited Partner Units Preferred units The number of preferred units converted to limited partner units during the reporting period. Preferred Unit Unamortized Premium The amount of preferred unit premium that was originally recognized at the issuance of units that has yet to be amortized and included in carrying value of preferred units. Preferred stock unamortized premium Premium Outlets [Member] Premium Outlets Represents information pertaining to Premium Outlets. Premium Outlet operations Prepaid Expense Notes Receivable and Other Assets Prepaids, notes receivable and other assets, net Represents the sum of prepaid expenses, notes receivables and other assets, not separately disclosed. Prien Lake Mall, Lake Charles, LA [Member] Represents information pertaining to Prien Lake Mall located at Lake Charles, LA. Prien Lake Mall, Lake Charles, LA Prime Outlets Acquisition Company and Affiliated Entities The Prime Outlets Acquisition Company and certain of its affiliated entities. Prime Outlets Acquisition Company and Affiliated Entities [Member] Cash inflows from the sale of partnership interests, other assets, and discontinued operations. Net proceeds from sale of assets Proceeds from Sale of Partnership Interests Other Assets and Discontinued Operations Net Net proceeds from sale of assets and interest in unconsolidated entities Profit (Loss) Excluding Preferred Distributions and Income Attributable to Redeemable Noncontrolling Interests in Consolidated Properties Net Income attributable to noncontrolling nonredeemable interests The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest and excluding preferred distributions and income attributable to redeemable noncontrolling interests in consolidated properties. Properties by Location [Axis] Properties segregated by location. Properties by Type [Axis] Properties segregated by major types of properties. Locations where the entity operates properties. Properties Location [Domain] Properties Type [Domain] Types of properties owned, managed and developed by the entity. Property Management Agreement Term Term of property management agreement Represents the term of the property management agreement. Termination period of property management agreement Represents the termination period of property management agreement by either party under the agreement. Property Management Agreement Termination Period Property Management Agreement Termination Prior Written Notice Period Period of prior written notice for termination of property management agreement Represents the period of prior written notice for termination of property management agreement by either party under the agreement. Property Management and Development Companies [Member] Property management and development companies Represents activity related to consolidated property management and development companies. Property Management Renewal Agreement Term Renewal term of property management agreement Represents the automatic renewal term of the property management agreement. Puerto Rico Premium Outlets, Barceloneta, PR [Member] Represents information pertaining to Puerto Rico Premium Outlets located at Barceloneta, PR. Puerto Rico Premium Outlets, Barceloneta, PR This element represents purchase of noncontrolling interests and other movements included in the statement of changes in stockholders' equity which are not separately disclosed or provided for elsewhere in the taxonomy. Purchase and disposition of noncontrolling interests, net, and other Purchase of Noncontrolling Interest and Other Purchase and disposition of noncontrolling interests, net Purchase of Noncontrolling Interests and Noncontrolling Interests in Newly Consolidated Properties and Other Purchase of noncontrolling interests, noncontrolling interests in newly consolidated properties and other Represents the purchase of noncontrolling interests, noncontrolling interests in newly consolidated properties and other movements included in the statement of changes in stockholders' equity, which are not separately disclosed or provided for elsewhere in the taxonomy. Queenstown Premium Outlets, Queenstown (Baltimore), MD [Member] Represents information pertaining to Queenstown Premium Outlets located at Queenstown (Baltimore), MD. Queenstown Premium Outlets, Queenstown (Baltimore), MD Real Estate Acquired Gain on Acquisition Gain on acquisition of property interests Represents the gain recognized upon acquisition of property interests. Real Estate, Acquisitions and Consolidations Acquisitions and consolidations The total amount of real estate investments acquired through acquisitions and the consolidations made to real estate investments during the period. Real Estate Acquisitions and Dispositions [Axis] Information about each real estate acquisitions and dispositions completed during the period. Real Estate Acquisitions and Dispositions Identification of the acquiree in a real estate acquisitions and dispositions, which may include the name or other type of identification of the acquiree. Real Estate Acquisitions and Dispositions [Domain] Real Estate Acquisitions and Dispositions [Line Items] Real Estate Acquisitions and Dispositions Schedule reflecting each real estate acquisitions and dispositions completed during the period. Real Estate Acquisitions and Dispositions [Table] Real Estate Acquisitions and Dispositions Real Estate Acquisitions Disposals and Impairment Disclosure [Text Block] The entire disclosure of real estate acquisitions, disposals, and impairments. Investment Properties Describes an entity's accounting policy for investments in real estate held solely for investment purposes (income production and capital appreciation). Real Estate Investment Properties [Policy Text Block] Percentage of property interests acquired as of the acquisition date. Real Estate Ownership Interests Acquired Property interest acquired (as a percent) Regency Plaza, St. Charles (St. Louis), MO [Member] Represents information pertaining to Regency Plaza located at St. Charles (St. Louis), MO. Regency Plaza, St. Charles (St. Louis), MO Related Party Debt Obligations Extinguished During the Period Related party debt obligations extinguished during the period Related party debt obligations extinguished during the period. Interest income from SPG-FCM and Mills loans, net of inter-entity eliminations Related Party Interest Income Net Interest income earned on notes receivable from related parties during the reporting period, net of inter-entity eliminations. Interest income from SPG-FCM and TMLP loans, net of inter-entity eliminations Development, royalty and other fees Represents information pertaining to the development, royalty and other fees charged to related party. Related Party Transaction Development Royalty and Other Fees [Member] Represents information pertaining to the fees for financing activities charged to the related party. Related Party Transaction Fees for Financing Activities [Member] Fees for financing activities Related Party Transaction Fees for Services Provided [Member] Amounts for services provided Represents information pertaining to the amounts for services provided to related party. Residential apartment buildings Represents the information pertaining to residential apartment buildings. Residential Apartment Buildings [Member] Represents activity related to retail properties and malls. Retail and Mall Property [Member] Non-core retail property and Mall Retail property Retail properties Represents real estate properties and units within those properties that are partially owned within the entity's financial statements. Retail Properties [Member] Represents the revolving credit facility and the supplemental revolving credit facility borrowed by the entity. The information pertaining to net total of both facilities related activities. Revolving Credit and Supplemental Revolving Credit Facility [Member] Credit Facility and the Supplemental Facility Richardson Square, Richardson (Dallas), TX [Member] Represents information pertaining to Richardson Square located at Richardson (Dallas), TX. Richardson Square, Richardson (Dallas), TX Richmond Town Square, Richmond Heights (Cleveland), OH [Member] Represents information pertaining to Richmond Town Square located at Richmond Heights (Cleveland), OH. Richmond Town Square, Richmond Heights (Cleveland), OH Rio Grande Valley Premium Outlets, Mercedes (McAllen), TX Rio Grande Valley Premium Outlets, Mercedes (McAllen), TX [Member] Represents information pertaining to Rio Grande Valley Premium Outlets located at Mercedes (McAllen), TX. River Oaks Center, Calumet City (Chicago), IL [Member] Represents information pertaining to River Oaks Center located at Calumet City (Chicago), IL. River Oaks Center, Calumet City (Chicago), IL Rockaway Commons, Rockaway (New York), NJ [Member] Represents information pertaining to Rockaway Commons located at Rockaway (New York), NJ. Rockaway Commons, Rockaway (New York), NJ Rockaway Town Plaza, Rockaway (New York), NJ [Member] Represents information pertaining to Rockaway Town Plaza located at Rockaway (New York), NJ. Rockaway Town Plaza, Rockaway (New York), NJ Rockaway Townsquare, Rockaway (New York), NJ [Member] Represents information pertaining to Rockaway Townsquare located at Rockaway (New York), NJ. Rockaway Townsquare, Rockaway (New York), NJ Rolling Oaks Mall, San Antonio, TX [Member] Represents information pertaining to Rolling Oaks Mall located at San Antonio, TX. Rolling Oaks Mall, San Antonio, TX Roosevelt Field, Garden City (New York), NY [Member] Represents information pertaining to Roosevelt Field located at Garden City (New York), NY. Roosevelt Field, Garden City (New York), NY Ross Park Mall, Pittsburgh, PA [Member] Represents information pertaining to Ross Park Mall located at Pittsburgh, PA. Ross Park Mall, Pittsburgh, PA Round Rock Premium Outlets, Round Rock (Austin), TX [Member] Represents information pertaining to Round Rock Premium Outlets located at Round Rock (Austin), TX. Round Rock Premium Outlets, Round Rock (Austin), TX Rushmore Mall, Rapid City, SD [Member] Represents information pertaining to Rushmore Mall located at Rapid City, SD. Rushmore Mall, Rapid City, SD Sale of Consolidated Properties Represents the sale of consolidated properties. Sale of Consolidated Properties [Member] San Marcos Premium Outlets, San Marcos, TX [Member] Represents information pertaining to San Marcos Premium Outlets located at San Marcos, TX. San Marcos Premium Outlets, San Marcos (Austin/San Antonio), TX Santa Rosa Plaza, Santa Rosa, CA [Member] Represents information pertaining to Santa Rosa Plaza located at Santa Rosa, CA. Santa Rosa Plaza, Santa Rosa, CA Sawgrass Mills Sunrise Miami FL [Member] Represents the information pertaining to Sawgrass Mills located at Sunrise (Miami), FL. Sawgrass Mills, Sunrise (Miami), FL Schedule of amortization, included in statements of operations and comprehensive income Disclosure of the components of amortization expense related to deferred financing and leasing costs. Schedule of Amortization of Deferred Cost [Table Text Block] Schedule of deferred costs and other assets Tabular disclosure of deferred costs and the carrying amounts of other assets. Schedule of Deferred Costs and Other Assets [Table Text Block] Schedule of deferred financing and leasing costs Tabular disclosure of deferred financing and leasing costs, including gross carrying amounts and accumulated amortization. Schedule of Deferred Financing and Leasing Costs [Table Text Block] Schedule of Disposal Groups Including Discontinued Operations Balance Sheet Disclosures Table [Text Block] Summary of the assets and liabilities transferred to Washington Prime as part of the spin-off Tabular disclosure of assets and liabilities transferred of disposal group. Schedule of Disposal Groups Including Discontinued Operations Income StatementI Disclosures Table [Text Block] Summarized financial information for discontinued operations Tabular disclosure of financial information of disposal group. Schedule of future minimum rentals to be received under non-cancelable tenant operating leases for each of the next five years and thereafter Tabular disclosure of the future minimum lease receivables as of the date of the latest balance sheet presented, in the aggregate and for each of the five succeeding fiscal years, under noncancelable tenant operating leases. Schedule of Future Minimum Rental Receivable under Operating Leases [Table Text Block] Schedule of Interest Cost Capitalized [Table Text Block] Schedule of interest capitalized Tabular disclosure of the interest costs capitalized during each period presented. Schedule of Limited Partners Preferred Interest in Operating Partnership and Other Interest in Properties [Table Text Block] Schedule of carrying values for securities classified in temporary equity Disclosure of limited partners preferred interest in operating partnership; preferred interest represents preference in liquidation, redemption, conversion, tax status of distribution or sharing in distributions and also includes other noncontrolling redeemable interests in properties. Schedule of Maturities of Long Term Debt on Joint Venture [Table Text Block] Scheduled principal payment repayments on joint venture properties' mortgages and other indebtedness Tabular disclosure of principal repayments on joint venture properties' mortgages and other indebtedness. Schedule of weighted average ownership interest of Simon Property in the operating partnership Disclosure of information and data related to ownership interest held by the parent of the reporting entity in the operating partnership. Schedule of Ownership Interest in Operating Partnership by Parent [Table Text Block] Schedule of LTIP units earned and aggregate grant date fair values adjusted for estimated forfeitures Represents information pertaining to LTIP units earned and aggregate grant date fair values adjusted for estimated forfeitures. Schedule of Share-based Compensation Arrangement by Share-based Payment Award, L T I P Units Earned and Aggregate Grant Date Fair Values Adjusted for Estimated Forfeitures [Table Text Block] Schedule of the taxable nature of distributions declared or paid during the reporting period. Schedule of Taxable Nature of Distributions Declared or Paid [Table Text Block] Schedule of taxable nature of distribution declared Seattle Premium Outlets, Tulalip (Seattle), WA [Member] Represents information pertaining to Seattle Premium Outlets located at Tulalip (Seattle), WA. Seattle Premium Outlets, Tulalip (Seattle), WA Outstanding nonredeemable series I preferred stock or outstanding series I preferred stock. Classified within stockholders' equity if nonredeemable or redeemable solely at the option of the issuer. Classified within temporary equity if redemption is outside the control of the issuer. Series I Preferred Stock [Member] Series I Preferred Units Series J Preferred Stock Outstanding nonredeemable series J preferred stock or outstanding series J preferred stock. Classified within stockholders' equity if nonredeemable or redeemable solely at the option of the issuer. Classified within temporary equity if redemption is outside the control of the issuer. Series J 8 3/8% Cumulative Redeemable Preferred Units Series J Preferred Stock [Member] Share Based Compensation Arrangement by Share Based Payment Award Additional Restricted Stock Award Value to Director Serving as Chairperson of Audit Committee Reflects the value of additional restricted stock awarded to a director serving as a chairperson of audit committee. Value of additional restricted shares awarded to director serving as the chairperson of the Audit and Compensation Committees Share Based Compensation Arrangement by Share Based Payment Award Additional Restricted Stock Award Value to Director Serving as Chairperson of Other Standing Committees Reflects the value of additional restricted stock awarded to a director serving as a chairperson of a standing committee other than the Audit Committee. Value of additional restricted shares awarded to director serving as chairperson of Governance and Nominating Committees Share Based Compensation Arrangement by Share Based Payment Award Additional Restricted Units Award to Lead Director Value Reflects the value of additional restricted stock awarded to the Lead Director. Value of additional restricted shares awarded to the Lead Director The aggregate grant date fair value of the awards made under the stock-based compensation plan. Share Based Compensation Arrangement by Share Based Payment Award, Aggregate Grant Date Fair Value Aggregate grant date fair value Expiration period Reflects the period as to when the equity-based award expires as specified in the award agreement. Share Based Compensation Arrangement by Share Based Payment Award, Award Expiration Period Share Based Compensation Arrangement By Share Based Payment Award, Award Post Performance Service Vesting Period Post performance period service based vesting period Represents the post performance period service based vesting period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Share Based Compensation Arrangement by Share Based Payment Award, Award Vesting Rights, Percentage at Second and Third Anniversary Vesting rights (as a percent) Represents the percentage of portion of stock-based compensation award for employees vesting at second and third anniversaries of performance period. Vesting rights (as a percent) Represents the portion of stock options for employees vesting on the day prior to the sixth, seventh and eighth anniversaries of grant, subject to continued employment. Share Based Compensation Arrangement by Share Based Payment Award, Award Vesting Rights Percentage Per Year The percentage of distributions paid on a unit of the entity that participants of the stock-based compensation plan are entitled to receive during the performance period. Share Based Compensation Arrangement by Share Based Payment Award, Distributions Percentage During Performance Period Percent of distributions that participants are entitled to receive during performance period Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other than Options Cumulative Grants Net of Forfeitures The number of grants, net of forfeitures of equity instruments that are not stock option plans awarded since inception of the plan. Total number of shares awarded, net of forfeiture Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other than Options Grants in Period Net of Forfeitures The number of shares (or other type of equity) issuable under an equity-based award plan pertaining to grants made during the period, net of forfeitures on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Shares of restricted stock awarded during the year, net of forfeitures Vesting period (in installments) Pursuant to the award agreements, the number of equal installments over which the award vests. Share Based Compensation Arrangement by Share Based Payment Award, Number of Vesting Installments Share Based Compensation Arrangement by Share Based Payment Award, Performance Period Performance period The number of years in the performance period for the purpose of setting performance goals for a share-based compensation plan. Value of restricted shares awarded to directors on initial election Share Based Compensation Arrangement by Share Based Payment Award Restricted Stock Award Value to Director on Initial Election Reflects the value of restricted stock awarded to non-employee directors upon initial election. Reflects the value of restricted stock awarded to non-employee directors upon re-election. Value of restricted shares awarded to director on re-election Share Based Compensation Arrangement by Share Based Payment Award Restricted Stock Award Value to Director on Reelection Our Share of Income from Unconsolidated Discontinued Operations The Company's share of gain on sale or disposal of assets and interests in unconsolidated entities. Share of Reporting Entity on Disposal of Interest in Joint Venture Shinsegae International Co [Member] Shinsegae International Co Represents information pertaining to the Shinsegae International Co. Shopping Centers [Member] Represents the shopping centers. Shopping centers Shops at Arbor Walk, The, Austin, TX [Member] Represents information pertaining to The Shops at Arbor Walk located at Austin, TX. Shops at Arbor Walk, The, Austin, TX Shops at Mission Viejo [Member] The Shops at Mission Viejo Represents the information regarding joint venture pertaining to The Shops at Mission Viejo in the Los Angeles suburb of Mission Viejo, California. Shops at Nanuet, The Nanuet, NY [Member] Shops at Nanuet, The, Nanuet, NY Represents information pertaining to Shops at Nanuet, The located at Nanuet, NY. Shops at North East Mall, The, Hurst (Dallas), TX [Member] Represents information pertaining to The Shops at North East Mall located at Hurst (Dallas), TX. Shops at North East Mall, The, Hurst (Dallas), TX Shopsat Riverside the Hackensack New York NJ [Member] Represents the information pertaining to The Shops at Riverside located at Hackensack New York, NJ. Shops at Riverside, The, Hackensack (New York), NJ Simon FCM Joint Venture [Member] SPG-FCM Represents the information pertaining to the SPG-FCM joint venture. Simon FCM Loan [Member] SPG-FCM Loan Represents activity related to the SPG-FCM loan. Simon Property Group Inc [Member] Simon Property Group, Inc. Represents information pertaining to Simon Property Group, Inc. Southdale Center Edina Minneapolis MN [Member] Represents the information pertaining to Southdale Center located at Edina (Minneapolis), MN. Southdale Center, Edina (Minneapolis), MN Southern Hills Mall, Sioux City, IA [Member] Represents information pertaining to Southern Hills Mall located at Sioux City, IA. Southern Hills Mall, Sioux City, IA Southern Park Mall, Youngstown, OH [Member] Represents information pertaining to Southern Park Mall located at Youngstown, OH. Southern Park Mall, Youngstown, OH South Hills Village, Pittsburgh, PA [Member] Represents information pertaining to South Hills Village located at Pittsburgh, PA. South Hills Village, Pittsburgh, PA SouthPark, Charlotte, NC [Member] Represents information pertaining to SouthPark located at Charlotte, NC. SouthPark, Charlotte, NC Southridge Mall Greendale Milwaukee WI [Member] Represents the information pertaining to Southridge Mall located at Greendale (Milwaukee), WI. Southridge Mall, Greendale (Milwaukee), WI South Shore Plaza, Braintree (Boston), MA [Member] Represents information pertaining to South Shore Plaza located at Braintree (Boston), MA. South Shore Plaza, Braintree (Boston), MA SPGFCM Joint Venture [Member] SPG-FCM Gallerie Commerciali Italia (GCI) joint venture in Italy in which the entity owns an interest. Stanford Shopping Center, Palo Alto (San Francisco), CA [Member] Represents information pertaining to Stanford Shopping Center located at Palo Alto (San Francisco), CA. Stanford Shopping Center, Palo Alto (San Jose), CA St. Augustine Premium Outlets, St. Augustine (Jacksonville), FL [Member] Represents information pertaining to St. Augustine Premium Outlets located at St. Augustine (Jacksonville), FL. St. Augustine Premium Outlets, St. Augustine (Jacksonville), FL St. Charles Towne Center, Waldorf (Washington, D.C.), MD [Member] Represents information pertaining to St. Charles Towne Center located at Waldorf (Washington, D.C.), MD. St. Charles Towne Center, Waldorf (Washington, D.C.), MD St. Charles Towne Plaza, Waldorf (Washington, D.C.), MD [Member] Represents information pertaining to St. Charles Towne Plaza located at Waldorf (Washington, D.C.), MD. St. Charles Towne Plaza, Waldorf (Washington, D.C.), MD Stock Incentive Plan1998 [Member] The Simon Property Group, L.P. 1998 Stock Incentive Plan. 1998 Stock Incentive Plan Stock Issued During Period Shares from Limited Partners Represents the number of partnership units exchanged for common stock. Number of partnership units exchanged by the Melvin Simon Family Enterprises Trust Strip center business and small malls Strip Center Business and Small Malls [Member] Represents information pertaining to the strip center business and other small malls transferred to Washington Prime Group, Inc. Structure Represents the period of time over which the entity allocates the initial cost of its land and building to structure. Structure [Member] Summit Mall, Akron, OH [Member] Represents information pertaining to Summit Mall located at Akron, OH. Summit Mall, Akron, OH Sunland Park Mall, El Paso, TX [Member] Represents information pertaining to Sunland Park Mall located at El Paso, TX. Sunland Park Mall, El Paso, TX Supplemental Revolving Credit Facility [Member] Supplemental Facility Represents the supplemental revolving credit facility borrowed by the entity. Tacoma Mall, Tacoma (Seattle), WA [Member] Represents information pertaining to Tacoma Mall located at Tacoma (Seattle), WA. Tacoma Mall, Tacoma (Seattle), WA Taxable nature of the distributions declared Taxable Nature of Distributions Declared [Abstract] Temporary Equity [Policy Text Block] Temporary Equity Disclosure of accounting policy for Temporary Equity. Term Loan [Member] Term loan Represents the term loan borrowed by the entity. Terrace at the Florida Mall, Orlando, FL [Member] Represents information pertaining to Terrace at the Florida Mall located at Orlando, FL. Terrace at the Florida Mall, Orlando, FL The Crossings Premium Outlets, Tannersville, PA [Member] Represents information pertaining to The Crossings Premium Outlets located at Tannersville, PA. The Crossings Premium Outlets, Tannersville, PA The Mills Acquisition 2012 [Member] TMLP 2012 acquisition Represents activity related to The Mills Limited Partnership 2012 acquisition. The Mills Acquisition [Member] Properties acquired in the 2007 acquisition of The Mills Corporation. The Mills acquisition The Mills Limited Partnership and SPGFCM Joint Venture [Member] TMLP and SPG-FCM Represents information pertaining to transactions with the Mills Limited Partnership and SPG-FCM joint venture. The Mills [Member] The Mills Represents information pertaining to Mills. The Shoppes at Branson Meadows, Branson, MO [Member] Represents information pertaining to The Shoppes at Branson Meadows located at Branson, MO. The Shoppes at Branson Meadows, Branson, MO Tippecanoe Mall, Lafayette, IN [Member] Represents information pertaining to Tippecanoe Mall located at Lafayette, IN. Tippecanoe Mall, Lafayette, IN Tippecanoe Plaza, Lafayette, IN [Member] Represents information pertaining to Tippecanoe Plaza located at Lafayette, IN. Tippecanoe Plaza, Lafayette, IN TMLP Senior Loan Facility Represents activity related to The Mills Limited Partnership (TMLP) senior loan facility. TMLP Senior Loan Facility [Member] TMLPS Trust Preferred Securities [Member] TMLP Trust Preferred Securities Represents activity related to The Mills Limited Partnership (TMLP) trust preferred securities. Town Center at Aurora, Aurora (Denver), CO [Member] Represents information pertaining to Town Center at Aurora located at Aurora (Denver), CO. Town Center at Aurora, Aurora (Denver), CO Town Center at Boca Raton, Boca Raton (Miami), FL [Member] Represents information pertaining to Town Center at Boca Raton located at Boca Raton (Miami), FL. Town Center at Boca Raton, Boca Raton (Miami), FL Town Center at Cobb, Kennesaw (Atlanta), GA [Member] Represents information pertaining to Town Center at Cobb located at Kennesaw (Atlanta), GA. Town Center at Cobb, Kennesaw (Atlanta), GA Towne East Square, Wichita, KS [Member] Represents information pertaining to Towne East Square located at Wichita, KS. Towne East Square, Wichita, KS Towne West Square, Wichita, KS [Member] Represents information pertaining to Towne West Square located at Wichita, KS. Towne West Square, Wichita, KS Transaction expenses This item represents amount of transaction expenses incurred by the entity during the period. Transaction Expenses Transaction Expenses [Abstract] Transaction Expenses Transaction Expenses Policy [Text Block] Transaction Expenses Describes an entity's accounting policies for expense related to acquisition, potential acquisition and disposition related costs. Minimum notice period for transition services agreement Represents the minimum notice period for termination of the transition services agreement. Transition Services Agreement Termination Minimum Notice Period Transition Services Agreement Termination Minimum Notice Period as Percentage of Original Service Period Minimum notice period as a percentage of original service period Represents the minimum notice period for termination of transition services agreement expressed as a percentage of original service period. Transition Services Agreement Termination Period Termination period of transition services agreement Represents the termination period of transition services agreement. Treasure Coast Square, Jensen Beach, FL [Member] Represents information pertaining to Treasure Coast Square located at Jensen Beach, FL. Treasure Coast Square, Jensen Beach, FL Type of Agreement [Axis] Information by category of agreements entered into by the entity. This item is to be populated with the collective of (i) types (categories) of agreements the entity has entered into with the related parties. Type of Agreement [Domain] Tyrone Square, St. Petersburg (Tampa), FL [Member] Represents information pertaining to Tyrone Square located at St. Petersburg (Tampa), FL. Tyrone Square, St. Petersburg (Tampa), FL U.S. Treasury or other U.S. government securities and corporate debt securities. U.S. Treasury or Government and Corporate Debt Securities [Member] Securities in captive insurance subsidiary portfolio United States and Puerto Rico [Member] U.S. and Puerto Rico Represents the United States and Puerto Rico locations. Units Issued Acquisitions Exchanges and Conversions Total number of units issued as a result of parent contribution of proceeds from public offerings. Issuance of units related to Simon Property public offerings For net-share settlement of share-based awards when the partnership settles the general partner's income tax withholding obligations, this element represents the number of units the general partner uses to repay the partnership. Units Paid for Tax Withholding for Partners Capital Account Contributed General partner contributions, units used to fund required withholding tax University Center, Mishawaka (South Bend), IN [Member] Represents information pertaining to University Center located at Mishawaka (South Bend), IN. University Center, Mishawaka, IN University Park Mall, Mishawaka (South Bend), IN [Member] Represents information pertaining to University Park Mall located at Mishawaka (South Bend), IN. University Park Mall, Mishawaka, IN University Town Plaza, Pensacola, FL [Member] University Town Plaza, Pensacola, FL Represents information pertaining to University Town Plaza located at Pensacola, FL. Upper Valley Mall, Springfield, OH [Member] Represents information pertaining to Upper Valley Mall located at Springfield, OH. Upper Valley Mall, Springfield, OH Usd Euro Forward Contract [Member] A currency forward contract related to fixing the USD-Euro exchange rate for delivery of a specified amount of foreign currency on a specified date. USD-Euro currency forward contract Usd Yen Forward Contract [Member] A currency forward contract related to fixing the USD-Yen exchange rate for delivery of a specified amount of foreign currency on a specified date. USD-Yen currency forward contract Vacaville Premium Outlets, Vacaville, CA [Member] Represents information pertaining to Vacaville Premium Outlets located at Vacaville, CA. Vacaville Premium Outlets, Vacaville, CA Valle Vista Mall, Harlingen, TX [Member] Represents information pertaining to Valle Vista Mall located at Harlingen, TX. Valle Vista Mall, Harlingen, TX Value Retail PLC [Member] Value Retail PLC Represents information pertaining to Value Retail PLC, in which the entity has a minority interest. Variable-Rate Debt: Variable Rate Debt [Abstract] Virginia Center Commons, Glen Allen, VA [Member] Represents information pertaining to Virginia Center Commons located at Glen Allen, VA. Virginia Center Commons, Glen Allen, VA Waikele Premium Outlets, Waipahu (Honolulu), HI [Member] Represents information pertaining to Waikele Premium Outlets located at Waipahu (Honolulu), HI. Waikele Premium Outlets, Waipahu (Honolulu), HI Walt Whitman Shops, Huntington Station (New York), NY [Member] Represents information pertaining to Walt Whitman Shops located at Huntington Station (New York), NY. Walt Whitman Shops, Huntington Station (New York), NY Washington Plaza, Indianapolis, IN [Member] Represents information pertaining to Washington Plaza located at Indianapolis, IN. Washington Plaza, Indianapolis, IN Washington Prime Group Inc [Member] Washington Prime Represents information pertaining to Washington Prime Group Inc. (Washington Prime), an independent publicly traded REIT. Washington Prime Group Lp [Member] Washington Prime Group, L.P. Represents information pertaining to Washington Prime Group, L.P. Washington Square, Indianapolis, IN [Member] Represents information pertaining to Washington Square located at Indianapolis, IN. Washington Square, Indianapolis, IN Waterford Lakes Town Center, Orlando, FL [Member] Represents information pertaining to Waterford Lakes Town Center located at Orlando, FL. Waterford Lakes Town Center, Orlando, FL Waterloo Premium Outlets, Waterloo, NY [Member] Represents information pertaining to Waterloo Premium Outlets located at Waterloo, NY. Waterloo Premium Outlets, Waterloo, NY Westminster Mall, Westminster (Los Angeles), CA [Member] Represents information pertaining to Westminster Mall located at Westminster (Los Angeles), CA. Westminster Mall, Westminster (Los Angeles), CA West Ridge Mall, Topeka, KS [Member] Represents information pertaining to West Ridge Mall located at Topeka, KS. West Ridge Mall, Topeka, KS West Ridge Plaza, Topeka, KS [Member] Represents information pertaining to West Ridge Plaza located at Topeka, KS. West Ridge Plaza, Topeka, KS White Oaks Mall, Springfield, IL [Member] Represents information pertaining to White Oaks Mall located at Springfield, IL. White Oaks Mall, Springfield, IL White Oaks Plaza, Springfield, IL [Member] Represents information pertaining to White Oaks Plaza located at Springfield, IL. White Oaks Plaza, Springfield, IL Williamsburg Premium Outlets, Williamsburg, VA [Member] Represents information pertaining to Williamsburg Premium Outlets located at Williamsburg, VA. Williamsburg Premium Outlets, Williamsburg, VA Wolfchase Galleria, Memphis, TN [Member] Represents information pertaining to Wolfchase Galleria located at Memphis, TN. Wolfchase Galleria, Memphis, TN Wolf Ranch, Georgetown Austin, TX [Member] Wolf Ranch, Georgetown (Austin), TX Represents information pertaining to Wolf Ranch located at Georgetown (Austin), TX. Wolf Ranch Town Center, Georgetown (Austin), TX [Member] Represents information pertaining to Wolf Ranch Town Center located at Georgetown (Austin), TX. Wolf Ranch Town Center, Georgetown (Austin), TX Woodburn Premium Outlets, Woodburn (Portland), OR Represents information pertaining to Woodburn Premium Outlets located at Woodburn (Portland), OR. 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