Percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ 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 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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- Details

Name:	us-gaap_DebtInstrumentAxis=lxp_UnsecuredRevolvingCreditFacilityExpiringAugust2019Member
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- Details

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Mortgages and Notes Payable - Credit Agreement Terms (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Remaining borrowing capacity	$ 505,000,000
Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Debt issuance costs, gross	1,267,000	$ 1,804,000
Unsecured Revolving Credit Facility, Expiring August 2019 [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Face amount	$ 505,000,000
Unsecured Term Loan, Expiring January 2021 [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Interest rate stated percentage rate range minimum excluding LIBOR	0.90%
Unsecured Term Loan, Expiring January 2021 [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Interest rate stated percentage rate range minimum excluding LIBOR	1.75%
Unsecured Term Loan, Expiring January 2021 [Member] \| Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Face amount	$ 300,000,000
Unsecured Term Loan, Expiring January 2019 [Member] \| Interest Rate Swap [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	1.42%
Unsecured Term Loan, Expiring January 2019 [Member] \| Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Face amount	$ 255,000,000
London Interbank Offered Rate (LIBOR) [Member] \| Unsecured Revolving Credit Facility, Expiring August 2019 [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Interest rate stated percentage rate range minimum excluding LIBOR	0.85%
London Interbank Offered Rate (LIBOR) [Member] \| Unsecured Revolving Credit Facility, Expiring August 2019 [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Interest rate stated percentage rate range minimum excluding LIBOR	1.55%
London Interbank Offered Rate (LIBOR) [Member] \| Unsecured Revolving Credit Facility, Expiring August 2019 [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate stated percentage rate range minimum excluding LIBOR	1.00%
London Interbank Offered Rate (LIBOR) [Member] \| Unsecured Term Loan, Expiring January 2021 [Member] \| Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Interest rate stated percentage rate range minimum excluding LIBOR	1.10%