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Investments in Real Estate and Real Estate Under Construction - Schedule of Development Arrangements Outstanding (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
sqft
Lender Subsidiary [Member]  
Investments in Real Estate and Real Estate Under Construction [Line Items]  
Area of real estate property 1,366,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= lxp_LenderSubsidiaryMember
Expected Maximum Commitment/Contribution $ 309,155lxp_ConstructionCommitmentMaximumAmount
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= lxp_LenderSubsidiaryMember
Industrial Property [Member] | Oak Creek Wisconsin [Member]  
Investments in Real Estate and Real Estate Under Construction [Line Items]  
Area of real estate property 164,000us-gaap_AreaOfRealEstateProperty
/ invest_InvestmentGeographicRegionAxis
= lxp_OakCreekWisconsinMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_IndustrialPropertyMember
Expected Maximum Commitment/Contribution 22,609lxp_ConstructionCommitmentMaximumAmount
/ invest_InvestmentGeographicRegionAxis
= lxp_OakCreekWisconsinMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_IndustrialPropertyMember
Lease Term (Years) 20 years
Industrial Property [Member] | Thomson, Georgia [Member]  
Investments in Real Estate and Real Estate Under Construction [Line Items]  
Area of real estate property 208,000us-gaap_AreaOfRealEstateProperty
/ invest_InvestmentGeographicRegionAxis
= lxp_ThomsonGeorgiaMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_IndustrialPropertyMember
Expected Maximum Commitment/Contribution 10,245lxp_ConstructionCommitmentMaximumAmount
/ invest_InvestmentGeographicRegionAxis
= lxp_ThomsonGeorgiaMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_IndustrialPropertyMember
Lease Term (Years) 15 years
Office Building [Member] | Richmond, Virginia [Member]  
Investments in Real Estate and Real Estate Under Construction [Line Items]  
Area of real estate property 330,000us-gaap_AreaOfRealEstateProperty
/ invest_InvestmentGeographicRegionAxis
= lxp_RichmondVirginiaMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OfficeBuildingMember
Expected Maximum Commitment/Contribution 110,137lxp_ConstructionCommitmentMaximumAmount
/ invest_InvestmentGeographicRegionAxis
= lxp_RichmondVirginiaMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OfficeBuildingMember
Lease Term (Years) 15 years
Office/R&D [Member] | Lake Jackson, Texas [Member]  
Investments in Real Estate and Real Estate Under Construction [Line Items]  
Area of real estate property 664,000us-gaap_AreaOfRealEstateProperty
/ invest_InvestmentGeographicRegionAxis
= lxp_LakeJacksonTexasMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= lxp_OfficeandRandDPropertyMember
Expected Maximum Commitment/Contribution $ 166,164lxp_ConstructionCommitmentMaximumAmount
/ invest_InvestmentGeographicRegionAxis
= lxp_LakeJacksonTexasMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= lxp_OfficeandRandDPropertyMember
Lease Term (Years) 20 years