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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
State and Local Jurisdiction [Member] |  |  |
Income Taxes [Line Items] |  |  |
State taxes paid | $ 1,598 | $ 1,252 | $ 679

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- Definition Income Taxes [Line Items] + References No definition available. + Details
Name: | lxp_IncomeTaxesLineItems
Namespace Prefix: | lxp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition State Taxes Paid + References No definition available. + Details
Name: | lxp_StateTaxesPaid
Namespace Prefix: | lxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=us-gaap_StateAndLocalJurisdictionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |