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Equity - Additional Information (Details) (USD $)
 12 Months Ended 0 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2014
Jul. 31, 2014
Jul. 31, 2013
Equity [Line Items]            
Common shares issued through public offering and direct share purchase plan during period 2,600,795us-gaap_StockIssuedDuringPeriodSharesNewIssues 36,012,313us-gaap_StockIssuedDuringPeriodSharesNewIssues 18,289,557us-gaap_StockIssuedDuringPeriodSharesNewIssues      
Proceeds from issuance of common shares $ 23,563,000us-gaap_ProceedsFromIssuanceOfCommonStock $ 434,927,000us-gaap_ProceedsFromIssuanceOfCommonStock $ 162,747,000us-gaap_ProceedsFromIssuanceOfCommonStock      
Shares, net of forfeitures 37,678us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation 1,893,409us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation 643,450us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation      
Effect net of tax 404,000us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax 4,439,000us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax        
OP unit equivalent in common shares 1.13lxp_PartnersCapitalEquivalentInCommonShares          
OP units, redemptions 1,962,000us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest 0us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest 0us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest      
Shares issued for units redeemed 29,086lxp_PartnersCapitalAccountSharesIssuedForUnitsRedeemed 202,241lxp_PartnersCapitalAccountSharesIssuedForUnitsRedeemed 257,427lxp_PartnersCapitalAccountSharesIssuedForUnitsRedeemed      
Partners' capital account, exchanges and conversions (148,000)us-gaap_PartnersCapitalAccountExchangesAndConversions (1,053,000)us-gaap_PartnersCapitalAccountExchangesAndConversions (1,343,000)us-gaap_PartnersCapitalAccountExchangesAndConversions      
OP units outstanding 3,422,000us-gaap_PartnersCapitalAccountUnits          
Payments to acquire interest in joint venture 2,100,000us-gaap_PaymentsToAcquireInterestInJointVenture 8,918,000us-gaap_PaymentsToAcquireInterestInJointVenture 0us-gaap_PaymentsToAcquireInterestInJointVenture      
Office Building [Member] | Joint Venture [Member] | Philadelphia, Pennsylvania [Member]            
Equity [Line Items]            
Payments to acquire interest in joint venture         2,100,000us-gaap_PaymentsToAcquireInterestInJointVenture
/ invest_InvestmentGeographicRegionAxis
= lxp_PhiladelphiaPennsylvaniaMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OfficeBuildingMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lxp_JointVentureMember		  
Real state, ownership percentage       80.50%lxp_RealEstateOwnership
/ invest_InvestmentGeographicRegionAxis
= lxp_PhiladelphiaPennsylvaniaMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OfficeBuildingMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lxp_JointVentureMember		 87.50%lxp_RealEstateOwnership
/ invest_InvestmentGeographicRegionAxis
= lxp_PhiladelphiaPennsylvaniaMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OfficeBuildingMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lxp_JointVentureMember		  
Industrial Property [Member] | Joint Venture [Member] | Long Island City, New York [Member]            
Equity [Line Items]            
Payments to acquire interest in joint venture           8,918,000us-gaap_PaymentsToAcquireInterestInJointVenture
/ invest_InvestmentGeographicRegionAxis
= lxp_LongIslandCityNewYorkMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_IndustrialPropertyMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lxp_JointVentureMember
Former LCIF II Partners [Member]            
Equity [Line Items]            
OP units redeemed 170,193lxp_PartnersCapitalAccountUnitsExchangedForCash
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= lxp_FormerLCIFIIPartnersMember		          
OP units, redemptions 1,962,000us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= lxp_FormerLCIFIIPartnersMember		          
Series C [Member]            
Equity [Line Items]            
Dividend rate, per-dollar-amount $ 3.25us-gaap_PreferredStockDividendRatePerDollarAmount
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember		          
Preferred shares to common shares conversion ratio 2.4339lxp_PreferredSharestoCommonSharesConversionRatio
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember		          
Series C [Member] | Minimum [Member]            
Equity [Line Items]            
Common share closing price percent of conversion price 125.00%lxp_CommonShareClosingPricePercentOfConversionPrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember		          
Cumulative Convertible [Member] | Series C [Member]            
Equity [Line Items]            
Preferred shares outstanding 1,935,400us-gaap_PreferredStockSharesOutstanding
/ lxp_PreferredStockTypeAxis
= us-gaap_ConvertiblePreferredStockMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember		 1,935,400us-gaap_PreferredStockSharesOutstanding
/ lxp_PreferredStockTypeAxis
= us-gaap_ConvertiblePreferredStockMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember		        
Preferred shares, liquidation preference 96,770,000lxp_PreferredStockAggregateLiquidationPreferenceValue
/ lxp_PreferredStockTypeAxis
= us-gaap_ConvertiblePreferredStockMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember		          
Public Offering And Direct Share Purchase Plan Proceeds [Member]            
Equity [Line Items]            
Proceeds from issuance of common shares 25,813,000us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_SubsidiarySaleOfStockAxis
= lxp_PublicOfferingAndDirectSharePurchasePlanProceedsMember		 399,566,000us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_SubsidiarySaleOfStockAxis
= lxp_PublicOfferingAndDirectSharePurchasePlanProceedsMember		 164,429,000us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_SubsidiarySaleOfStockAxis
= lxp_PublicOfferingAndDirectSharePurchasePlanProceedsMember		      
At The Market [Member]            
Equity [Line Items]            
Common shares issued through public offering and direct share purchase plan during period   3,409,927us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_SubsidiarySaleOfStockAxis
= lxp_AtMarketMember		        
Value authorized   100,000,000lxp_StockholdersEquityShareIssuancePlanValueAuthorized
/ us-gaap_SubsidiarySaleOfStockAxis
= lxp_AtMarketMember		        
Value, new issues   $ 36,884,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_SubsidiarySaleOfStockAxis
= lxp_AtMarketMember