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Investments in Real Estate and Real Estate Under Construction - Summary of development arrangements outstanding (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
sqft
Investments in Real Estate and Real Estate Under Construction [Line Items]  
Square Feet 1,366,000us-gaap_AreaOfRealEstateProperty
Expected Maximum Commitment/Contribution $ 309,155lxp_ConstructionCommitmentMaximumAmount
Oak Creek Wisconsin [Member] | Industrial property [Member]  
Investments in Real Estate and Real Estate Under Construction [Line Items]  
Square Feet 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
Thomson, Georgia [Member] | Industrial property [Member]  
Investments in Real Estate and Real Estate Under Construction [Line Items]  
Square Feet 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
Richmond, Virginia [Member] | Office Building [Member]  
Investments in Real Estate and Real Estate Under Construction [Line Items]  
Square Feet 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
Lake Jackson, Texas [Member] | Office Building [Member]  
Investments in Real Estate and Real Estate Under Construction [Line Items]  
Square Feet 664,000us-gaap_AreaOfRealEstateProperty
/ invest_InvestmentGeographicRegionAxis
= lxp_LakeJacksonTexasMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OfficeBuildingMember
Expected Maximum Commitment/Contribution $ 166,164lxp_ConstructionCommitmentMaximumAmount
/ invest_InvestmentGeographicRegionAxis
= lxp_LakeJacksonTexasMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OfficeBuildingMember
Lease Term (Years) 20 years