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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 | 2,600,795 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 36,012,313 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 18,289,557 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  |  |
Proceeds from issuance of common shares | $ 23,563,000 us-gaap_ProceedsFromIssuanceOfCommonStock | $ 434,927,000 us-gaap_ProceedsFromIssuanceOfCommonStock | $ 162,747,000 us-gaap_ProceedsFromIssuanceOfCommonStock |  |  |
Shares, net of forfeitures | 37,678 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation | 1,893,409 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation | 643,450 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation |  |  |
Effect net of tax | 404,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax | 4,439,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax |  |  |  |
OP unit equivalent in common shares | 1.13 lxp_PartnersCapitalEquivalentInCommonShares |  |  |  |  |
OP units, redemptions | 1,962,000 us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest | 0 us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest | 0 us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest |  |  |
Shares issued for units redeemed | 29,086 lxp_PartnersCapitalAccountSharesIssuedForUnitsRedeemed | 202,241 lxp_PartnersCapitalAccountSharesIssuedForUnitsRedeemed | 257,427 lxp_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 | 3,422,000 us-gaap_PartnersCapitalAccountUnits |  |  |  |  |
Payments to acquire interest in joint venture | 2,100,000 us-gaap_PaymentsToAcquireInterestInJointVenture | 8,918,000 us-gaap_PaymentsToAcquireInterestInJointVenture | 0 us-gaap_PaymentsToAcquireInterestInJointVenture |  |  |
Office Building [Member] | Joint Venture [Member] | Philadelphia, Pennsylvania [Member] |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |
Payments to acquire interest in joint venture |  |  |  |  | 2,100,000 us-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 |  |  |  |  |  | 8,918,000 us-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 | 170,193 lxp_PartnersCapitalAccountUnitsExchangedForCash / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = lxp_FormerLCIFIIPartnersMember |  |  |  |  |
OP units, redemptions | 1,962,000 us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = lxp_FormerLCIFIIPartnersMember |  |  |  |  |
Series C [Member] |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |
Dividend rate, per-dollar-amount | $ 3.25 us-gaap_PreferredStockDividendRatePerDollarAmount / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |  |  |  |
Preferred shares to common shares conversion ratio | 2.4339 lxp_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 | 1,935,400 us-gaap_PreferredStockSharesOutstanding / lxp_PreferredStockTypeAxis = us-gaap_ConvertiblePreferredStockMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember | 1,935,400 us-gaap_PreferredStockSharesOutstanding / lxp_PreferredStockTypeAxis = us-gaap_ConvertiblePreferredStockMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |  |  |
Preferred shares, liquidation preference | 96,770,000 lxp_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 | 25,813,000 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_SubsidiarySaleOfStockAxis = lxp_PublicOfferingAndDirectSharePurchasePlanProceedsMember | 399,566,000 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_SubsidiarySaleOfStockAxis = lxp_PublicOfferingAndDirectSharePurchasePlanProceedsMember | 164,429,000 us-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 |  | 3,409,927 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_SubsidiarySaleOfStockAxis = lxp_AtMarketMember |  |  |  |
Value authorized |  | 100,000,000 lxp_StockholdersEquityShareIssuancePlanValueAuthorized / us-gaap_SubsidiarySaleOfStockAxis = lxp_AtMarketMember |  |  |  |
Value, new issues |  | $ 36,884,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_SubsidiarySaleOfStockAxis = lxp_AtMarketMember |  |  |  |

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