Business Combination, Additional Consideration Transferred

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Construction Commitment Maximum Amount

+ References

No definition available.

+ Details

Name:	lxp_ConstructionCommitmentMaximumAmount
Namespace Prefix:	lxp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	lxp_InvestmentsInRealEstateAndRealEstateUnderConstructionLineItems
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Balance Type:	na
Period Type:	duration

- Definition

Real Estate Investments, Distribution Percentage

+ References

No definition available.

+ Details

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Namespace Prefix:	lxp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Real Estate Investments, Invested Capital Threshold for Distribution

+ References

No definition available.

+ Details

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Namespace Prefix:	lxp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 25

-Paragraph 23

-URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e1043-128460

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 30

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 30

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479

+ Details

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

- Definition

The current amount of expenditures for a real estate project that has not yet been completed.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.10)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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

- 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

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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://www.xbrl.org/2003/role/presentationRef

-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=6879938&loc=d3e572229-122910

+ Details

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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://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 4

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6812-107765

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-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

+ Details

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

- Definition

Amount of cash outflow for costs that are essential to originate the lease and would not otherwise have been incurred without the lease agreement. Amount includes, but is not limited to, cash outflows to evaluate the lessee's credit condition, guarantees, and collateral and cash outflows for costs incurred in negotiating, processing, and executing the lease agreement.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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Investments in Real Estate and Real Estate Under Construction Summary of acquisitions and build-to-suit transactions (Details) (USD $)	6 Months Ended
	Jun. 30, 2013 sqft	Jun. 30, 2012	Dec. 31, 2012
Investments in Real Estate and Real Estate Under Construction [Line Items]
Initial Cost Basis	$ 166,468,000
Land	20,055,000
Building and Improvements	132,401,000
Lease in-place Value	14,012,000
Aggregate aquisition expenses	250,000	380,000
Square Feet	1,163,000
Expected Maximum Commitment/Contribution	98,600,000
Development in Process	23,099,000		65,122,000
Long Island City New York [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Real Estate Investments, Invested Capital Threshold for Distribution	25,000,000
Industrial Property [Member] \| Long Island City New York [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Initial Cost Basis	42,124,000
Land	0
Building and Improvements	42,124,000
Lease in-place Value	0
Industrial Property [Member] \| Houston, Texas [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Initial Cost Basis	81,400,000
Land	15,055,000
Building and Improvements	57,949,000
Lease in-place Value	8,396,000
Office Property [Member] \| Denver Colorado [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Initial Cost Basis	34,547,000
Land	2,207,000
Building and Improvements	26,724,000
Lease in-place Value	5,616,000
Business Combination, Additional Consideration Transferred	3,825,000
Retail Property [Member] \| Tuscaloosa Alabama [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Initial Cost Basis	8,397,000
Land	2,793,000
Building and Improvements	5,604,000
Lease in-place Value	0
Payments for Leasing Costs	$ 323,000
Up to $25,000 [Member] \| Long Island City New York [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Real Estate Investments, Distribution Percentage	6.30%
In excess of $25,000 [Member] \| Long Island City New York [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Real Estate Investments, Distribution Percentage	11.00%
Any Excess Return [Member] \| Long Island City New York [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Real Estate Investments, Distribution Percentage	50.00%