2.4.0.6 Html 176 239 1 true 51 0 false 7 false false R1.htm 0001000 - Document - Document and Entity Information Sheet http://www.libertyproperty.com/role/DocumentAndEntityInformation Document and Entity Information true false R2.htm 1001000 - Statement - Consolidated Balance Sheets Sheet http://www.libertyproperty.com/role/ConsolidatedBalanceSheets Consolidated Balance Sheets false false R3.htm 1001500 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://www.libertyproperty.com/role/ConsolidatedBalanceSheetsParenthetical Consolidated Balance Sheets (Parenthetical) false false R4.htm 1002000 - Statement - Consolidated Statements of Income Sheet http://www.libertyproperty.com/role/ConsolidatedStatementsOfIncome Consolidated Statements of Income false false R5.htm 1002500 - Statement - Consolidated Statements of Operations (Parenthetical) Sheet http://www.libertyproperty.com/role/ConsolidatedStatementsOfOperationsParenthetical Consolidated Statements of Operations (Parenthetical) false false R6.htm 1003000 - Statement - Consolidated Statement of Equity Sheet http://www.libertyproperty.com/role/ConsolidatedStatementOfEquity Consolidated Statement of Equity false false R7.htm 1004000 - Statement - Consolidated Statements of Cash Flows Sheet http://www.libertyproperty.com/role/ConsolidatedStatementsOfCashFlows Consolidated Statements of Cash Flows false false R8.htm 2101100 - Disclosure - Organization and Basis of Presentation Sheet http://www.libertyproperty.com/role/OrganizationAndBasisOfPresentation Organization and Basis of Presentation false false R9.htm 2102100 - Disclosure - Income per Common Share of the Trust Sheet http://www.libertyproperty.com/role/IncomePerCommonShareOfTrust Income per Common Share of the Trust false false R10.htm 2103100 - Disclosure - Income per Common Unit of the Operating Partnership Sheet http://www.libertyproperty.com/role/IncomePerCommonUnitOfOperatingPartnership Income per Common Unit of the Operating Partnership false false R11.htm 2104100 - Disclosure - Other Comprehensive Income of the Trust Sheet http://www.libertyproperty.com/role/OtherComprehensiveIncomeOfTrust Other Comprehensive Income of the Trust false false R12.htm 2105100 - Disclosure - Other Comprehensive Income of the Operating Partnership Sheet http://www.libertyproperty.com/role/OtherComprehensiveIncomeOfOperatingPartnership Other Comprehensive Income of the Operating Partnership false false R13.htm 2106100 - Disclosure - Segment Information Sheet http://www.libertyproperty.com/role/SegmentInformation Segment Information false false R14.htm 2107100 - Disclosure - Accounting for the Impairment or Disposal of Long-Lived Assets Sheet http://www.libertyproperty.com/role/AccountingForImpairmentOrDisposalOfLongLivedAssets Accounting for the Impairment or Disposal of Long-Lived Assets false false R15.htm 2108100 - Disclosure - Noncontrolling Interests Sheet http://www.libertyproperty.com/role/NoncontrollingInterests Noncontrolling Interests false false R16.htm 2109100 - Disclosure - Limited Partners' Equity of the Operating Partnership Sheet http://www.libertyproperty.com/role/LimitedPartnersEquityOfOperatingPartnership Limited Partners' Equity of the Operating Partnership false false R17.htm 2110100 - Disclosure - Noncontrolling Interest - Operating Partnership/Limited Partners' Equity - Preferred Units Sheet http://www.libertyproperty.com/role/NoncontrollingInterestOperatingPartnershiplimitedPartnersEquityPreferredUnits Noncontrolling Interest - Operating Partnership/Limited Partners' Equity - Preferred Units false false R18.htm 2111100 - Disclosure - Investments in Unconsolidated Joint Ventures Sheet http://www.libertyproperty.com/role/InvestmentsInUnconsolidatedJointVentures Investments in Unconsolidated Joint Ventures false false R19.htm 2112100 - Disclosure - Indebtedness Sheet http://www.libertyproperty.com/role/Indebtedness Indebtedness false false R20.htm 2113100 - Disclosure - Disclosure of Fair Value of Financial Instruments Sheet http://www.libertyproperty.com/role/DisclosureOfFairValueOfFinancialInstruments Disclosure of Fair Value of Financial Instruments false false R21.htm 2114100 - Disclosure - Commitments and Contingencies Sheet http://www.libertyproperty.com/role/CommitmentsAndContingencies Commitments and Contingencies false false R22.htm 2115100 - Disclosure - Supplemental Disclosure to Statements of Cash Flows Sheet http://www.libertyproperty.com/role/SupplementalDisclosureToStatementsOfCashFlows Supplemental Disclosure to Statements of Cash Flows false false R23.htm 2201201 - Disclosure - Organization and Basis of Presentation (Policy) Sheet http://www.libertyproperty.com/role/OrganizationAndBasisOfPresentationPolicy Organization and Basis of Presentation (Policy) false false R24.htm 2302301 - Disclosure - Income per Common Share of the Trust (Tables) Sheet http://www.libertyproperty.com/role/IncomePerCommonShareOfTrustTables Income per Common Share of the Trust (Tables) false false R25.htm 2303301 - Disclosure - Income per Common Unit of the Operating Partnership (Tables) Sheet http://www.libertyproperty.com/role/IncomePerCommonUnitOfOperatingPartnershipTables Income per Common Unit of the Operating Partnership (Tables) false false R26.htm 2306301 - Disclosure - Segment Information (Tables) Sheet http://www.libertyproperty.com/role/SegmentInformationTables Segment Information (Tables) false false R27.htm 2307301 - Disclosure - Accounting for the Impairment or Disposal of Long-Lived Assets (Tables) Sheet http://www.libertyproperty.com/role/AccountingForImpairmentOrDisposalOfLongLivedAssetsTables Accounting for the Impairment or Disposal of Long-Lived Assets (Tables) false false R28.htm 2308301 - Disclosure - Noncontrolling Interests (Tables) Sheet http://www.libertyproperty.com/role/NoncontrollingInterestsTables Noncontrolling Interests (Tables) false false R29.htm 2309301 - Disclosure - Limited Partners' Equity of the Operating Partnership (Tables) Sheet http://www.libertyproperty.com/role/LimitedPartnersEquityOfOperatingPartnershipTables Limited Partners' Equity of the Operating Partnership (Tables) false false R30.htm 2310301 - Disclosure - Noncontrolling Interest - Operating Partnership/Limited Partners' Equity - Preferred Units (Tables) Sheet http://www.libertyproperty.com/role/NoncontrollingInterestOperatingPartnershiplimitedPartnersEquityPreferredUnitsTables Noncontrolling Interest - Operating Partnership/Limited Partners' Equity - Preferred Units (Tables) false false R31.htm 2313301 - Disclosure - Disclosure of Fair Value of Financial Instruments Disclosure of Fair Value of Financial Instruments (Tables) Sheet http://www.libertyproperty.com/role/DisclosureOfFairValueOfFinancialInstrumentsDisclosureOfFairValueOfFinancialInstrumentsTables Disclosure of Fair Value of Financial Instruments Disclosure of Fair Value of Financial Instruments (Tables) false false R32.htm 2314301 - Disclosure - Commitments and Contingencies (Tables) Sheet http://www.libertyproperty.com/role/CommitmentsAndContingenciesTables Commitments and Contingencies (Tables) false false R33.htm 2315301 - Disclosure - Supplemental Disclosure to Statements of Cash Flows (Tables) Sheet http://www.libertyproperty.com/role/SupplementalDisclosureToStatementsOfCashFlowsTables Supplemental Disclosure to Statements of Cash Flows (Tables) false false R34.htm 2401402 - Disclosure - Organization and Basis of Presentation (Narrative) (Details) Sheet http://www.libertyproperty.com/role/OrganizationAndBasisOfPresentationNarrativeDetails Organization and Basis of Presentation (Narrative) (Details) false false R35.htm 2402402 - Disclosure - Income per Common Share of the Trust (Details) Sheet http://www.libertyproperty.com/role/IncomePerCommonShareOfTrustDetails Income per Common Share of the Trust (Details) false false R36.htm 2403402 - Disclosure - Income per Common Unit of the Operating Partnership (Details) Sheet http://www.libertyproperty.com/role/IncomePerCommonUnitOfOperatingPartnershipDetails Income per Common Unit of the Operating Partnership (Details) false false R37.htm 2406402 - Disclosure - Segment Information - Company's Reportable Segments (Details) Sheet http://www.libertyproperty.com/role/SegmentInformationCompanysReportableSegmentsDetails Segment Information - Company's Reportable Segments (Details) false false R38.htm 2406403 - Disclosure - Segment Information - Performance of the Reportable Segments Based on Property Level Operating Income (Details) Sheet http://www.libertyproperty.com/role/SegmentInformationPerformanceOfReportableSegmentsBasedOnPropertyLevelOperatingIncomeDetails Segment Information - Performance of the Reportable Segments Based on Property Level Operating Income (Details) false false R39.htm 2406404 - Disclosure - Segment Information Segment Information - Total Assets by Segment (Details) Sheet http://www.libertyproperty.com/role/SegmentInformationSegmentInformationTotalAssetsBySegmentDetails Segment Information Segment Information - Total Assets by Segment (Details) false false R40.htm 2407402 - Disclosure - Accounting for the Impairment or Disposal of Long-Lived Assets - Impairment (Details) Sheet http://www.libertyproperty.com/role/AccountingForImpairmentOrDisposalOfLongLivedAssetsImpairmentDetails Accounting for the Impairment or Disposal of Long-Lived Assets - Impairment (Details) false false R41.htm 2407403 - Disclosure - Accounting for the Impairment or Disposal of Long-Lived Assets - Results of Operations for the Properties Held for Sale and Disposed (Details) Sheet http://www.libertyproperty.com/role/AccountingForImpairmentOrDisposalOfLongLivedAssetsResultsOfOperationsForPropertiesHeldForSaleAndDisposedDetails Accounting for the Impairment or Disposal of Long-Lived Assets - Results of Operations for the Properties Held for Sale and Disposed (Details) false false R42.htm 2408402 - Disclosure - Noncontrolling Interests - Narrative (Details) Sheet http://www.libertyproperty.com/role/NoncontrollingInterestsNarrativeDetails Noncontrolling Interests - Narrative (Details) false false R43.htm 2408403 - Disclosure - Noncontrolling Interests - Outstanding Cumulative Redeemable Preferred Units (Details) Sheet http://www.libertyproperty.com/role/NoncontrollingInterestsOutstandingCumulativeRedeemablePreferredUnitsDetails Noncontrolling Interests - Outstanding Cumulative Redeemable Preferred Units (Details) false false R44.htm 2409402 - Disclosure - Limited Partners' Equity of the Operating Partnership Limited Partners' Equity of the Operating Partnership - Narrative (Details) Sheet http://www.libertyproperty.com/role/LimitedPartnersEquityOfOperatingPartnershipLimitedPartnersEquityOfOperatingPartnershipNarrativeDetails Limited Partners' Equity of the Operating Partnership Limited Partners' Equity of the Operating Partnership - Narrative (Details) false false R45.htm 2409403 - Disclosure - Limited Partners' Equity of the Operating Partnership Limited Partners' Equity of the Operating Partnership - Outstanding Cumulative Redeemable Preferred Stock(Details) Sheet http://www.libertyproperty.com/role/LimitedPartnersEquityOfOperatingPartnershipLimitedPartnersEquityOfOperatingPartnershipOutstandingCumulativeRedeemablePreferredStockdetails Limited Partners' Equity of the Operating Partnership Limited Partners' Equity of the Operating Partnership - Outstanding Cumulative Redeemable Preferred Stock(Details) false false R46.htm 2410402 - Disclosure - Noncontrolling Interest - Operating Partnership/Limited Partners' Equity - Preferred Units (Details) Sheet http://www.libertyproperty.com/role/NoncontrollingInterestOperatingPartnershiplimitedPartnersEquityPreferredUnitsDetails Noncontrolling Interest - Operating Partnership/Limited Partners' Equity - Preferred Units (Details) false false R47.htm 2411401 - Disclosure - Investments in Unconsolidated Joint Ventures Investment in Unconsolidated Joint Ventures (Details) Sheet http://www.libertyproperty.com/role/InvestmentsInUnconsolidatedJointVenturesInvestmentInUnconsolidatedJointVenturesDetails Investments in Unconsolidated Joint Ventures Investment in Unconsolidated Joint Ventures (Details) false false R48.htm 2412401 - Disclosure - Indebtedness (Details) Sheet http://www.libertyproperty.com/role/IndebtednessDetails Indebtedness (Details) false false R49.htm 2413402 - Disclosure - Disclosure of Fair Value of Financial Instruments Disclosure of Fair Value of Financial Instruments - Level 3 Rollforward (Details) Sheet http://www.libertyproperty.com/role/DisclosureOfFairValueOfFinancialInstrumentsDisclosureOfFairValueOfFinancialInstrumentsLevel3RollforwardDetails Disclosure of Fair Value of Financial Instruments Disclosure of Fair Value of Financial Instruments - Level 3 Rollforward (Details) false false R50.htm 2414402 - Disclosure - Commitments and Contingencies - Future Minimum Rental Payments (Details) Sheet http://www.libertyproperty.com/role/CommitmentsAndContingenciesFutureMinimumRentalPaymentsDetails Commitments and Contingencies - Future Minimum Rental Payments (Details) false false R51.htm 2414403 - Disclosure - Commitments and Contingencies - Narrative (Details) Sheet http://www.libertyproperty.com/role/CommitmentsAndContingenciesNarrativeDetails Commitments and Contingencies - Narrative (Details) false false R52.htm 2415402 - Disclosure - Supplemental Disclosure to Statements of Cash Flows (Details) Sheet http://www.libertyproperty.com/role/SupplementalDisclosureToStatementsOfCashFlowsDetails Supplemental Disclosure to Statements of Cash Flows (Details) false false All Reports Book All Reports Element lry_AmortizedCostOnDeferredFinancingAndLeasingCosts had a mix of decimals attribute values: -3 0. Element us-gaap_ImpairmentOfRealEstate had a mix of decimals attribute values: -5 0. 'Shares' elements on report '2403402 - Disclosure - Income per Common Unit of the Operating Partnership (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '2406404 - Disclosure - Segment Information Segment Information - Total Assets by Segment (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '2407403 - Disclosure - Accounting for the Impairment or Disposal of Long-Lived Assets - Results of Operations for the Properties Held for Sale and Disposed (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '2408403 - Disclosure - Noncontrolling Interests - Outstanding Cumulative Redeemable Preferred Units (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '2409403 - Disclosure - Limited Partners' Equity of the Operating Partnership Limited Partners' Equity of the Operating Partnership - Outstanding Cumulative Redeemable Preferred Stock(Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '2410402 - Disclosure - Noncontrolling Interest - Operating Partnership/Limited Partners' Equity - Preferred Units (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '2412401 - Disclosure - Indebtedness (Details)' had a mix of different decimal attribute values. Process Flow-Through: 1001000 - Statement - Consolidated Balance Sheets Process Flow-Through: Removing column 'Sep. 30, 2011' Process Flow-Through: Removing column 'Dec. 31, 2010' Process Flow-Through: 1001500 - Statement - Consolidated Balance Sheets (Parenthetical) Process Flow-Through: 1002000 - Statement - Consolidated Statements of Income Process Flow-Through: 1002500 - Statement - Consolidated Statements of Operations (Parenthetical) Process Flow-Through: 1004000 - Statement - Consolidated Statements of Cash Flows lry-20120930.xml lry-20120930.xsd lry-20120930_cal.xml lry-20120930_def.xml lry-20120930_lab.xml lry-20120930_pre.xml true true