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Commitments and Contingencies Additional Information (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Aug. 31, 2019
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Commitments and Contingencies Disclosure [Abstract] |  |
Outstanding rent receivable | $ 1,231 | $ 1,100

X
- Definition Lessor, Operating Lease, Outstanding Rent Receivable + References No definition available. + Details
Name: | lxp_LessorOperatingLeaseOutstandingRentReceivable
Namespace Prefix: | lxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration