The Company and Financial Statement Presentation - Additional Information (Details)	9 Months Ended
Sep. 30, 2021 property joint_venture state
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of properties \| property	140
Number of states in which entity has interests \| state	28
Joint Ventures with Developers \| Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Number of joint ventures acquired \| joint_venture	4
Joint Ventures with Developers \| Variable Interest Entity, Primary Beneficiary \| Minimum
Variable Interest Entity [Line Items]
VIE, ownership percentage	80.00%
Joint Ventures with Developers \| Variable Interest Entity, Primary Beneficiary \| Maximum
Variable Interest Entity [Line Items]
VIE, ownership percentage	93.00%
LCIF \| Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
VIE, ownership percentage	99.00%
Fairburn JV \| Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
VIE, ownership percentage	87.00%

Joint Venture Interests, Number Acquired

No definition available.

Name:	lxp_JointVentureInterestsNumberAcquired
Namespace Prefix:	lxp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfRealEstateProperties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	us-gaap_VariableInterestEntityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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=123419778&loc=SL6759159-111685

+ Details

Name:	us-gaap_VariableInterestEntityOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=lxp_JointVenturesWithDevelopersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ConsolidatedEntitiesAxis=us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=lxp_LCIFMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=lxp_FairburnJVMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: