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Investments in Real Estate and Real Estate Under Construction - Schedule of Development Arrangements Outstanding (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 sqft
Lender Subsidiary [Member] |
Investments in Real Estate and Real Estate Under Construction [Line Items] |
Area of real estate property | 1,366,000 us-gaap_AreaOfRealEstateProperty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = lxp_LenderSubsidiaryMember
Expected Maximum Commitment/Contribution | $ 309,155 lxp_ConstructionCommitmentMaximumAmount / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = lxp_LenderSubsidiaryMember
Industrial Property [Member] | Oak Creek Wisconsin [Member] |
Investments in Real Estate and Real Estate Under Construction [Line Items] |
Area of real estate property | 164,000 us-gaap_AreaOfRealEstateProperty / invest_InvestmentGeographicRegionAxis = lxp_OakCreekWisconsinMember / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_IndustrialPropertyMember
Expected Maximum Commitment/Contribution | 22,609 lxp_ConstructionCommitmentMaximumAmount / invest_InvestmentGeographicRegionAxis = lxp_OakCreekWisconsinMember / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_IndustrialPropertyMember
Lease Term (Years) | 20 years
Industrial Property [Member] | Thomson, Georgia [Member] |
Investments in Real Estate and Real Estate Under Construction [Line Items] |
Area of real estate property | 208,000 us-gaap_AreaOfRealEstateProperty / invest_InvestmentGeographicRegionAxis = lxp_ThomsonGeorgiaMember / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_IndustrialPropertyMember
Expected Maximum Commitment/Contribution | 10,245 lxp_ConstructionCommitmentMaximumAmount / invest_InvestmentGeographicRegionAxis = lxp_ThomsonGeorgiaMember / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_IndustrialPropertyMember
Lease Term (Years) | 15 years
Office Building [Member] | Richmond, Virginia [Member] |
Investments in Real Estate and Real Estate Under Construction [Line Items] |
Area of real estate property | 330,000 us-gaap_AreaOfRealEstateProperty / invest_InvestmentGeographicRegionAxis = lxp_RichmondVirginiaMember / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember
Expected Maximum Commitment/Contribution | 110,137 lxp_ConstructionCommitmentMaximumAmount / invest_InvestmentGeographicRegionAxis = lxp_RichmondVirginiaMember / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember
Lease Term (Years) | 15 years
Office/R&D [Member] | Lake Jackson, Texas [Member] |
Investments in Real Estate and Real Estate Under Construction [Line Items] |
Area of real estate property | 664,000 us-gaap_AreaOfRealEstateProperty / invest_InvestmentGeographicRegionAxis = lxp_LakeJacksonTexasMember / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = lxp_OfficeandRandDPropertyMember
Expected Maximum Commitment/Contribution | $ 166,164 lxp_ConstructionCommitmentMaximumAmount / invest_InvestmentGeographicRegionAxis = lxp_LakeJacksonTexasMember / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = lxp_OfficeandRandDPropertyMember
Lease Term (Years) | 20 years

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- Definition Construction Commitment Maximum Amount + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Balance Type: | na
Period Type: | duration

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- Definition Lease Term + References No definition available. + Details
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Namespace Prefix: | lxp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |