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Lease Accounting - Additional Information (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Aug. 31, 2019
Lessee, Lease, Description [Line Items] |  |
Receivable deemed uncollectable | $ 352 |
Outstanding rent receivable | 1,231 | $ 1,100
Lease execution costs | $ 163 |
Remaining lease term | 44 years |
Renewal term | 54 years |
Sublease income | $ 2,823 |
Minimum |  |
Lessee, Lease, Description [Line Items] |  |
Renewal term | 5 years |
Maximum |  |
Lessee, Lease, Description [Line Items] |  |
Renewal term | 10 years |

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- Definition Lessee, Operating Lease, Remaining Lease Term + References No definition available. + Details
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Namespace Prefix: | lxp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Lessor, Lease Execution Costs + References No definition available. + Details
Name: | lxp_LessorLeaseExecutionCosts
Namespace Prefix: | lxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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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- Definition Lessor, Operating Lease, Receivable Deemed Uncollectable + References No definition available. + Details
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Namespace Prefix: | lxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount of sublease income excluding finance and operating lease expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 + Details
Name: | us-gaap_SubleaseIncome
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |