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Investments in Real Estate and Real Estate Under Construction - Schedule of Net Real Estate (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Investments in Real Estate and Real Estate Under Construction [Line Items]    
Buildings and building improvements $ 2,895,585us-gaap_InvestmentBuildingAndBuildingImprovements $ 3,008,709us-gaap_InvestmentBuildingAndBuildingImprovements
Land, land estates and land improvements 755,168us-gaap_LandAndLandImprovements 793,418us-gaap_LandAndLandImprovements
Fixtures and equipment 5,861us-gaap_FixturesAndEquipmentGross 5,861us-gaap_FixturesAndEquipmentGross
Construction in progress 14,946us-gaap_DevelopmentInProcess 4,306us-gaap_DevelopmentInProcess
Real estate - intangible assets 705,566us-gaap_FiniteLivedIntangibleAssetsGross 762,157us-gaap_FiniteLivedIntangibleAssetsGross
Investments in real estate under construction 106,238us-gaap_ConstructionInProgressGross 74,350us-gaap_ConstructionInProgressGross
Real estate, gross 4,483,364lxp_RealEstateInvestmentPropertyFiniteLivedIntangibleAssetsAndConstructionInProgressGross 4,648,801lxp_RealEstateInvestmentPropertyFiniteLivedIntangibleAssetsAndConstructionInProgressGross
Accumulated depreciation and amortization(1) (1,196,114)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation [1] (1,223,381)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation [1]
Real estate, net 3,287,250lxp_RealEstateInvestmentPropertyFiniteLivedIntangibleAssetsAndConstructionInProgressNet 3,425,420lxp_RealEstateInvestmentPropertyFiniteLivedIntangibleAssetsAndConstructionInProgressNet
Accumulated amortization 400,628us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization 447,764us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Amortization expense, next 12 months 35,894us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
Amortization expense, year 2 30,221us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
Amortization expense, year 3 26,905us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
Amortization expense, year 4 23,179us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
Amortization expense, year 5 18,014us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Leases, Acquired-in-Place [Member]    
Investments in Real Estate and Real Estate Under Construction [Line Items]    
Real estate - intangible assets 473,377us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LeasesAcquiredInPlaceMember		 486,743us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LeasesAcquiredInPlaceMember
Tenant Relationships [Member]    
Investments in Real Estate and Real Estate Under Construction [Line Items]    
Real estate - intangible assets 133,796us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= lxp_TenantRelationshipsMember		 172,640us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= lxp_TenantRelationshipsMember
Above Market Leases [Member]    
Investments in Real Estate and Real Estate Under Construction [Line Items]    
Real estate - intangible assets $ 98,393us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_AboveMarketLeasesMember		 $ 102,774us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_AboveMarketLeasesMember
[1] Includes accumulated amortization of real estate intangible assets of $400,628 and $447,764 in 2014 and 2013, respectively. The estimated amortization of the above real estate intangible assets for the next five years is $35,894 in 2015, $30,221 in 2016, $26,905 in 2017, $23,179 in 2018 and $18,014 in 2019.