Investments in Real Estate - Schedule of Real Estate Acquisitions (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Sep. 30, 2019	Jun. 30, 2019
Real Estate [Line Items]
Initial Cost Basis		$ 259,950
Land		18,526
Building and Improvements		217,695
Lease in-place Value Intangible		23,729
Indianapolis, Indiana \| Industrial Property
Real Estate [Line Items]
Initial Cost Basis		20,809
Land		1,954
Building and Improvements		16,820
Lease in-place Value Intangible		2,035
Atlanta, Georgia \| Industrial Property \| Atlanta, Georgia, Industrial Property Acquired in February 2019
Real Estate [Line Items]
Initial Cost Basis		37,182
Land		3,253
Building and Improvements		30,951
Lease in-place Value Intangible		2,978
Atlanta, Georgia \| Industrial Property \| Atlanta, Georgia, Industrial Property Acquired in June 2019, Property 1
Real Estate [Line Items]
Initial Cost Basis		45,441
Land		3,251
Building and Improvements		40,023
Lease in-place Value Intangible		2,167
Atlanta, Georgia \| Industrial Property \| Atlanta, Georgia, Industrial Property Acquired in June 2019, Property 2
Real Estate [Line Items]
Initial Cost Basis		27,353
Land		2,536
Building and Improvements		22,825
Lease in-place Value Intangible		1,992
Dallas, Texas \| Industrial Property
Real Estate [Line Items]
Initial Cost Basis		28,201
Land		2,420
Building and Improvements		23,330
Lease in-place Value Intangible		2,451
Spartanburg, South Carolina \| Industrial Property
Real Estate [Line Items]
Initial Cost Basis		33,253
Land		1,615
Building and Improvements		27,829
Lease in-place Value Intangible		3,809
Memphis, Tennessee \| Industrial Property \| Memphis, Tennessee, Industrial Property Expiring 2024
Real Estate [Line Items]
Initial Cost Basis		49,395
Land		2,646
Building and Improvements		40,452
Lease in-place Value Intangible		6,297
Memphis, Tennessee \| Industrial Property \| Memphis, Tennessee, Industrial Property Expiring 2023
Real Estate [Line Items]
Initial Cost Basis		18,316
Land		851
Building and Improvements		15,465
Lease in-place Value Intangible		$ 2,000
Richland, Washington \| Industrial Property \| Forecast
Real Estate [Line Items]
Initial Cost Basis	$ 67,000

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477

+ Details

Name:	us-gaap_BusinessCombinationConsiderationTransferred1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

This element represents the amount of value allocated by a lessor (acquirer) to lease agreements which exist at acquisition of a leased property. Such amount may include the value assigned to existing tenant relationships and excludes the market adjustment component of the value assigned for above or below-market leases acquired.

+ References

No definition available.

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetAcquiredInPlaceLeases
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Aggregate of the carrying amounts as of the balance sheet date of investments in building and building improvements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(d))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

+ Details

Name:	us-gaap_InvestmentBuildingAndBuildingImprovements
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.13)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 4
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6812-107765

+ Details

Name:	us-gaap_Land
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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

- Details

Name:	invest_InvestmentGeographicRegionAxis=lxp_IndianapolisIndianaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=srt_IndustrialPropertyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	invest_InvestmentGeographicRegionAxis=lxp_AtlantaGeorgiaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=lxp_AtlantaGeorgiaIndustrialPropertyAcquiredinFebruary2019Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=lxp_AtlantaGeorgiaIndustrialPropertyAcquiredinJune2019Property1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=lxp_AtlantaGeorgiaIndustrialPropertyAcquiredinJune2019Property2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	invest_InvestmentGeographicRegionAxis=lxp_DallasTexasMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	invest_InvestmentGeographicRegionAxis=lxp_SpartanburgSouthCarolinaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	invest_InvestmentGeographicRegionAxis=lxp_MemphisTennesseeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=lxp_MemphisTennesseeIndustrialPropertyExpiring2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=lxp_MemphisTennesseeIndustrialPropertyExpiring2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	invest_InvestmentGeographicRegionAxis=lxp_RichlandWashingtonMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: