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Investments in Real Estate and Real Estate Under Construction - Summary of development arrangements outstanding (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 sqft
Investments in Real Estate and Real Estate Under Construction [Line Items] |
Square Feet | 1,366,000 us-gaap_AreaOfRealEstateProperty
Expected Maximum Commitment/Contribution | $ 309,155 lxp_ConstructionCommitmentMaximumAmount
Oak Creek Wisconsin [Member] | Industrial property [Member] |
Investments in Real Estate and Real Estate Under Construction [Line Items] |
Square Feet | 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
Thomson, Georgia [Member] | Industrial property [Member] |
Investments in Real Estate and Real Estate Under Construction [Line Items] |
Square Feet | 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
Richmond, Virginia [Member] | Office Building [Member] |
Investments in Real Estate and Real Estate Under Construction [Line Items] |
Square Feet | 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
Lake Jackson, Texas [Member] | Office Building [Member] |
Investments in Real Estate and Real Estate Under Construction [Line Items] |
Square Feet | 664,000 us-gaap_AreaOfRealEstateProperty / invest_InvestmentGeographicRegionAxis = lxp_LakeJacksonTexasMember / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember
Expected Maximum Commitment/Contribution | $ 166,164 lxp_ConstructionCommitmentMaximumAmount / invest_InvestmentGeographicRegionAxis = lxp_LakeJacksonTexasMember / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember
Lease Term (Years) | 20 years

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

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- Details
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Namespace Prefix: | lxp_
Data Type: | xbrli:stringItemType
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: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | invest_InvestmentGeographicRegionAxis=lxp_OakCreekWisconsinMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | invest_InvestmentGeographicRegionAxis=lxp_RichmondVirginiaMember
Namespace Prefix: |
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Balance Type: |
Period Type: |

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