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Impairment of Real Estate (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Continuing Operations [Member]      
Impairment of Real Estate      
Impairment charges on real estate $ 34,833us-gaap_ImpairmentOfRealEstate
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember		 $ 21,640us-gaap_ImpairmentOfRealEstate
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember		 $ 4,262us-gaap_ImpairmentOfRealEstate
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
Carrying value of impaired asset 37,750lxp_CarryingValueofImpairedAsset
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember		    
Discontinued Operations [Member]      
Impairment of Real Estate      
Impairment charges on real estate 13,767us-gaap_ImpairmentOfRealEstate
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember		 12,920us-gaap_ImpairmentOfRealEstate
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember		 5,707us-gaap_ImpairmentOfRealEstate
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
Mortgages [Member] | Continuing Operations [Member]      
Impairment of Real Estate      
Non-recourse debt $ 61,763us-gaap_NonRecourseDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember