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

Lessor, Operating Lease, Outstanding Rent Receivable

No definition available.

Name:	lxp_LessorOperatingLeaseOutstandingRentReceivable
Namespace Prefix:	lxp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant