The Company and Financial Statement Presentation - Additional Information (Details)	6 Months Ended
Jun. 30, 2020 state Property
Variable Interest Entity [Line Items]
Number of properties \| Property	140
Number of states in which entity has interests \| state	29
Variable Interest Entity, Primary Beneficiary \| NNN Office Joint Venture
Variable Interest Entity [Line Items]
VIE, ownership percentage	90.00%
LCIF \| Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
VIE, ownership percentage	97.00%

The number of real estate properties owned as of the balance sheet date.

No definition available.

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- Definition

The number of states the entity operates in as of the balance sheet date.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121559654&loc=SL6759159-111685

+ Details

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- Details

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- Details

Name:	srt_OwnershipAxis=lxp_NNNOfficeJointVentureMember
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- Details

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