Debt Instrument, Aggregate Credit Facility Amount

No definition available.

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- Definition

Debt Instrument, Increase in Credit Facility

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

Debt Instrument Interest Leverage Ratio Rate Range Maximum To Obtain Lower Interest Rate Stated Percentage

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Debt Instrument Interest Leverage Ratio Rate Range Minimum To Obtain Lower Interes tRate Stated Percentage

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Property Purchase Price

+ References

No definition available.

+ Details

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

- Definition

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

+ References

No definition available.

+ Details

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

- Definition

The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

+ References

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

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 16, 20

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

+ Details

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

- Definition

Interest rate stated in the contractual debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Period Type:	instant

- Definition

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (a),(c)

-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph a

-Clause 1

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 205G

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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

- Definition

Gross amount of debt extinguished.

+ References

No definition available.

+ Details

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

- Definition

Amount borrowed under the credit facility as of the balance sheet date.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

No definition available.

+ Details

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

- Definition

The amount of square footage related to a real estate property.

+ References

No definition available.

+ Details

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

- Details

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Subsequent Events (Details) (USD $)		2 Months Ended				2 Months Ended			2 Months Ended
Subsequent Events (Details) (USD $)	Jan. 28, 2011	Feb. 27, 2012 Huntington, West Virginia [Member] Acquisition [Member] sqft	Dec. 31, 2011 Secured Term Loan [Member]	Dec. 31, 2010 Secured Term Loan [Member]	Dec. 31, 2008 Secured Term Loan [Member]	Feb. 27, 2012 Secured Term Loan [Member] Refinancing of Debt [Member]	Feb. 27, 2012 Secured Revolving Credit Facility [Member] Refinancing of Debt [Member]	Feb. 27, 2012 Nonrecourse Mortgage [Member] Acquisition [Member]	Feb. 27, 2012 Nonrecourse Mortgage [Member] Tulsa, Oklahoma [Member] Disposal [Member]	Feb. 27, 2012 Condition One [Member] Secured Term Loan [Member] Refinancing of Debt [Member]	Feb. 27, 2012 Condition One [Member] Secured Revolving Credit Facility [Member] Refinancing of Debt [Member]	Feb. 27, 2012 Condition Two [Member] Secured Term Loan [Member] Refinancing of Debt [Member]	Feb. 27, 2012 Condition Two [Member] Secured Revolving Credit Facility [Member] Refinancing of Debt [Member]	Feb. 27, 2012 Condition Three [Member] Secured Term Loan [Member] Refinancing of Debt [Member]	Feb. 27, 2012 Condition Three [Member] Secured Revolving Credit Facility [Member] Refinancing of Debt [Member]	Feb. 27, 2012 Condition Four [Member] Secured Term Loan [Member] Refinancing of Debt [Member]	Feb. 27, 2012 Condition Four [Member] Secured Revolving Credit Facility [Member] Refinancing of Debt [Member]	Feb. 27, 2012 Secured Revolving Credit Facility, Expiring January 2014 [Member] Secured Term Loan [Member] Refinancing of Debt [Member]	Feb. 27, 2012 Secured Revolving Credit Facility, Expiring January 2014 [Member] Secured Revolving Credit Facility [Member] Refinancing of Debt [Member]	Feb. 27, 2012 Secured Revolving Credit Facility, Expiring January 2015 [Member] Secured Term Loan [Member] Refinancing of Debt [Member]	Feb. 27, 2012 Secured Revolving Credit Facility, Expiring January 2015 [Member] Secured Revolving Credit Facility [Member] Refinancing of Debt [Member]
Subsequent Event [Line Items]
Basis spread on variable rate										2.00%	1.625%	2.25%	1.875%	2.45%	2.125%	2.85%	2.375%
Interest leverage ratio rate range minimum to obtain lower interest rate stated percentage	50.00%											45.00%	45.00%	50.00%	50.00%	55.00%	55.00%
Debt Instrument, Increase in Credit Facility							$ 225,000,000
Debt Instrument, Aggregate Credit Facility Amount							525,000,000
Revolving credit facility amount outstanding						62,150,000												108,000,000		108,000,000	28,000,000
Interest Rate						1.512%		4.20%												3.76%
Extinguishment of Debt, Amount									1,700,000
Repayments of Debt						60,551,000
Assumed liability for the fair value of the swap			3,236,000	5,280,000	5,696,000	3,539,000
Interest leverage ratio rate range maximum to obtain lower interest rate stated percentage	60.00%									45.00%	45.00%	50.00%	50.00%	55.00%	55.00%
Debt instrument amount						215,000,000		6,500,000											300,000,000		300,000,000
Square feet		70,000
Property purchase price		$ 12,600,000