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Investment in and Advances to Non-Consolidated Entities (Details) (USD $) | 12 Months Ended | 1 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 partnership | Nov. 30, 2014 | Aug. 31, 2013 | Oct. 31, 2013 | Mar. 31, 2013 | Jul. 31, 2012 | Oct. 31, 2014
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |
Investment in joint venture | $ 2,948,000 us-gaap_PaymentsToAcquireEquityMethodInvestments | $ 8,193,000 us-gaap_PaymentsToAcquireEquityMethodInvestments | $ 20,172,000 us-gaap_PaymentsToAcquireEquityMethodInvestments |  |  |  |  |  |
Number of joint venture formed during period |  |  | 2 lxp_EquityMethodInvestmentNumberOfJointVentureFormedDuringPeriod |  |  |  |  |  |
Lexington Reality Advisors Inc [Member] |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |
Advisory fees | 417,000 us-gaap_InvestmentAdvisoryFees / dei_LegalEntityAxis = lxp_LexingtonRealityAdvisorsIncMember | 512,000 us-gaap_InvestmentAdvisoryFees / dei_LegalEntityAxis = lxp_LexingtonRealityAdvisorsIncMember | 875,000 us-gaap_InvestmentAdvisoryFees / dei_LegalEntityAxis = lxp_LexingtonRealityAdvisorsIncMember |  |  |  |  |  |
Mortgages [Member] |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |
Mortgage debt | 5,503,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |  |  |  |  |  |  |  |
Houston, Texas [Member] |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |
Anticipated construction cost |  |  |  | 86,491,000 lxp_RealEstateInvestmentsJointVenturesAnticipatedConstructionCost / invest_InvestmentGeographicRegionAxis = lxp_HoustonTexasMember |  |  |  |  |
Maximum construction financing | 56,686,000 lxp_RealEstateInvestmentsJointVenturesMaximumConstructionFinancing / invest_InvestmentGeographicRegionAxis = lxp_HoustonTexasMember |  |  |  |  |  |  |  |
Baltimore, Maryland [Member] |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |
Lease Term (Years) |  |  |  |  | 99 years |  |  |  |
Investment in joint venture |  |  |  |  | 5,000,000 us-gaap_PaymentsToAcquireEquityMethodInvestments / invest_InvestmentGeographicRegionAxis = lxp_BaltimoreMarylandMember |  |  |  |
Joint Venture [Member] |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |
Co-venture equity ownership percentage |  |  |  |  |  | 15.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lxp_JointVentureMember |  |  |
Lease Term (Years) |  |  |  |  |  | 20 years |  |  |
Investment in joint venture |  |  |  |  |  | 39,456,000 us-gaap_PaymentsToAcquireEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lxp_JointVentureMember |  |  |
Advances to affiliate |  |  |  |  |  | 18,791,000 us-gaap_AdvancesToAffiliate / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lxp_JointVentureMember |  |  |
Debt interest rate percentage |  |  |  |  |  | 4.01%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lxp_JointVentureMember |  |  |
Joint Venture [Member] | Nonrecourse Mortgage [Member] |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |
Debt interest rate percentage |  |  | 4.70%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lxp_NonrecourseMortgageMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lxp_JointVentureMember |  |  |  |  |  |
Mortgage debt |  |  | 15,260,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = lxp_NonrecourseMortgageMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lxp_JointVentureMember |  |  |  |  |  |
Joint Venture [Member] | Houston, Texas [Member] |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |
Co-venture equity ownership percentage | 25.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / invest_InvestmentGeographicRegionAxis = lxp_HoustonTexasMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lxp_JointVentureMember |  |  |  |  |  |  |  |
Lease Term (Years) |  |  |  | 20 years |  |  |  |  |
Joint Venture [Member] | Palm Beach Gardens, Florida [Member] |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |
Co-venture equity ownership percentage |  |  | 36.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / invest_InvestmentGeographicRegionAxis = lxp_PalmBeachGardensFloridaMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lxp_JointVentureMember |  |  |  | 25.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / invest_InvestmentGeographicRegionAxis = lxp_PalmBeachGardensFloridaMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lxp_JointVentureMember |  |
Lease Term (Years) |  |  | 15 years |  |  |  |  |  |
Advances to affiliate |  |  | 12,000,000 us-gaap_AdvancesToAffiliate / invest_InvestmentGeographicRegionAxis = lxp_PalmBeachGardensFloridaMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lxp_JointVentureMember |  |  |  |  |  |
Property purchase price |  |  | 29,750,000 lxp_PropertyPurchasePrice / invest_InvestmentGeographicRegionAxis = lxp_PalmBeachGardensFloridaMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lxp_JointVentureMember |  |  |  |  |  |
Distributions payable to real estate partnerships |  |  |  |  |  |  | 2,557,000 us-gaap_DistributionsPayableToRealEstatePartnerships / invest_InvestmentGeographicRegionAxis = lxp_PalmBeachGardensFloridaMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lxp_JointVentureMember |  |
Joint Venture [Member] | Humble, Texas [Member] |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |
Co-venture equity ownership percentage |  |  | 15.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / invest_InvestmentGeographicRegionAxis = lxp_HumbleTexasMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lxp_JointVentureMember |  |  |  |  |  |
Lease Term (Years) |  |  | 17 years |  |  |  |  |  |
Property purchase price |  |  | 27,750,000 lxp_PropertyPurchasePrice / invest_InvestmentGeographicRegionAxis = lxp_HumbleTexasMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lxp_JointVentureMember |  |  |  |  |  |
Partnership [Member] |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |
Economic interest in joint venture |  |  | 100.00%lxp_EconomicInterestinJointVenture / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_PartnershipMember |  |  |  |  |  |
Number of partnerships | 5 lxp_EquityMethodInvestmentNumberofPartnerships / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_PartnershipMember |  |  |  |  |  |  |  |
Partnership [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |
Co-venture equity ownership percentage | 27.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_PartnershipMember |  |  |  |  |  |  |  |
Partnership [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |
Co-venture equity ownership percentage | 40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_PartnershipMember |  |  |  |  |  |  |  |
Partnership [Member] | Mortgages [Member] |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |
Mortgage debt | 13,757,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_PartnershipMember |  |  |  |  |  |  |  |
Interest rate range, maximum | 5.20%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_PartnershipMember |  |  |  |  |  |  |  |
Pemlex LLC [Member] |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from divestiture of interest in consolidated subsidiaries |  |  |  |  |  |  |  | 13,218,000 us-gaap_ProceedsFromDivestitureOfInterestInConsolidatedSubsidiaries / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lxp_PemlexLlcMember |
Gain (loss) on disposition of subsidiary |  |  |  |  |  |  |  | 0 us-gaap_GainOrLossOnSaleOfStockInSubsidiary / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lxp_PemlexLlcMember |
Concord and CDH CDO [Member] |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |
Carrying value of equity method investments |  |  | 0 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lxp_ConcordAndCdhCdoMember |  |  |  |  |  |
Investment sold, carrying amount |  |  | 7,000,000 us-gaap_EquityMethodInvestmentSoldCarryingAmount / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lxp_ConcordAndCdhCdoMember |  |  |  |  |  |
Other Nonconsolidated Entity [Member] |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |
Loss on impairment | 930,000 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lxp_OtherNonconsolidatedEntityMember | 925,000 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lxp_OtherNonconsolidatedEntityMember |  |  |  |  |  |  |
Realized gain (loss) on disposal |  |  |  |  |  |  |  |  | $ 87,000 us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lxp_OtherNonconsolidatedEntityMember

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