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Investments in Real Estate and Real Estate Under Construction - Summary of properties to be acquired (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015
Business Acquisition [Line Items] |
Estimated acquisition cost | $ 184,680 lxp_EstimatedRealEstatePurchasePrice
Richland, Washington [Member] | Industrial property [Member] |
Business Acquisition [Line Items] |
Estimated acquisition cost | 155,000 lxp_EstimatedRealEstatePurchasePrice / invest_InvestmentGeographicRegionAxis = lxp_RichlandWashingtonMember / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_IndustrialPropertyMember
Lease term (years) | 20 years
Detroit, Michigan [Member] | Industrial property [Member] |
Business Acquisition [Line Items] |
Estimated acquisition cost | $ 29,680 lxp_EstimatedRealEstatePurchasePrice / invest_InvestmentGeographicRegionAxis = lxp_DetroitMichiganMember / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_IndustrialPropertyMember
Lease term (years) | 20 years

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- Definition Estimated Real Estate Purchase Price + References No definition available. + Details
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Namespace Prefix: | lxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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- Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration

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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_RichlandWashingtonMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |