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Investments in Real Estate and Real Estate Under Construction - Summary of properties to be acquired (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Business Acquisition [Line Items]  
Estimated acquisition cost $ 184,680lxp_EstimatedRealEstatePurchasePrice
Richland, Washington [Member] | Industrial property [Member]  
Business Acquisition [Line Items]  
Estimated acquisition cost 155,000lxp_EstimatedRealEstatePurchasePrice
/ invest_InvestmentGeographicRegionAxis
= lxp_RichlandWashingtonMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_IndustrialPropertyMember
Lease term (years) 20 years
Detroit, Michigan [Member] | Industrial property [Member]  
Business Acquisition [Line Items]  
Estimated acquisition cost $ 29,680lxp_EstimatedRealEstatePurchasePrice
/ invest_InvestmentGeographicRegionAxis
= lxp_DetroitMichiganMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_IndustrialPropertyMember
Lease term (years) 20 years