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Equity - Additional Information (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Equity [Line Items]      
Proceeds from issuance of common shares $ 6,582us-gaap_ProceedsFromIssuanceOfCommonStock $ 4,433us-gaap_ProceedsFromIssuanceOfCommonStock  
Gains and Losses on Cash Flow Hedges, Beginning 404us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax    
OP unit equivalent in common shares 1.13lxp_PartnersCapitalEquivalentInCommonShares    
Redemption of noncontrolling OP units   (1,962)lxp_CashandStockIssuedDuringPeriodValueConversionofUnits  
Partners capital account, shares issued for units redeemed   2,605lxp_PartnersCapitalAccountSharesIssuedForUnitsRedeemed  
Partners' capital account, units 3,422,000us-gaap_PartnersCapitalAccountUnits    
Parent [Member]      
Equity [Line Items]      
Partners' capital account, redemption for common shares   13lxp_PartnersCapitalAccountRedemptionForCommonShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
 
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]      
Equity [Line Items]      
Gains and Losses on Cash Flow Hedges, Beginning     404us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Former LCIF II Partners [Member]      
Equity [Line Items]      
Partners capital account, units exchanged for cash 170,193lxp_PartnersCapitalAccountUnitsExchangedForCash
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= lxp_FormerLCIFIIPartnersMember
   
Redemption of noncontrolling OP units 1,962lxp_CashandStockIssuedDuringPeriodValueConversionofUnits
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= lxp_FormerLCIFIIPartnersMember
   
Trustees [Member]      
Equity [Line Items]      
Deferred compensation arrangement with individual, shares issued 14,000us-gaap_DeferredCompensationArrangementWithIndividualSharesIssued
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
14,000us-gaap_DeferredCompensationArrangementWithIndividualSharesIssued
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
 
Deferred compensation arrangement with individual, fair value of shares issued 157us-gaap_DeferredCompensationArrangementWithIndividualFairValueOfSharesIssued
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
142us-gaap_DeferredCompensationArrangementWithIndividualFairValueOfSharesIssued
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
 
Direct Share Purchase Plan [Member]      
Equity [Line Items]      
Common shares issued during period 627,247us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ lxp_ShareholdersEquityByPlanAxis
= lxp_DirectSharePurchasePlanMember
564,501us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ lxp_ShareholdersEquityByPlanAxis
= lxp_DirectSharePurchasePlanMember
 
Proceeds from issuance of common shares 6,685us-gaap_ProceedsFromIssuanceOfCommonStock
/ lxp_ShareholdersEquityByPlanAxis
= lxp_DirectSharePurchasePlanMember
5,416us-gaap_ProceedsFromIssuanceOfCommonStock
/ lxp_ShareholdersEquityByPlanAxis
= lxp_DirectSharePurchasePlanMember
 
Performance Shares [Member]      
Equity [Line Items]      
Grants in period 170,650us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
   
Weighted average grant date fair value $ 1,916us-gaap_StockGrantedDuringPeriodValueSharebasedCompensationGross
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
   
Award vesting period 3 years    
Performance Shares [Member] | Executive Officer [Member]      
Equity [Line Items]      
Measurement period 3 years    
Index Performance Shares [Member] | Executive Officer [Member]      
Equity [Line Items]      
Measurement period basis 321,018us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross
/ us-gaap_AwardTypeAxis
= lxp_IndexPerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
   
Fair value per share $ 6.86lxp_DeferredCompensationArrangementwithIndividualFairValueofSharesIssuedPerShare
/ us-gaap_AwardTypeAxis
= lxp_IndexPerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
   
Peer Performance Shares [Member] | Executive Officer [Member]      
Equity [Line Items]      
Measurement period basis 321,011us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross
/ us-gaap_AwardTypeAxis
= lxp_PeerPerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
   
Fair value per share $ 6.66lxp_DeferredCompensationArrangementwithIndividualFairValueofSharesIssuedPerShare
/ us-gaap_AwardTypeAxis
= lxp_PeerPerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember