Additional Contingent Loan

No definition available.

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- Definition

Fee For Extending Mortgage Loan Receivable By One Year Percent

+ References

No definition available.

+ Details

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- Definition

Loans Receivable, Discounted Payoff, Number

+ References

No definition available.

+ Details

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- Definition

Number Of Classes Of Financing Receivable

+ References

No definition available.

+ Details

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- Definition

Number Of Properties Representing Equity Interest Entity Received As Pledge From Borrower To Secure Notes Receivable

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Number Of Real Estate Properties Financed By Entity

+ References

No definition available.

+ Details

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- Definition

Number Of Types Of Financing Receivable

+ References

No definition available.

+ Details

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- Definition

Operating Leases Minimum Payments Receivable Over Term Average Amount

+ References

No definition available.

+ Details

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

- Definition

Percent Of Equity Interest Entity Received As Pledge From Borrower To Secure Notes Receivable

+ References

No definition available.

+ Details

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- Definition

Proceeds From Prepayments Of Mortgage Notes Receivable

+ References

No definition available.

+ Details

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

- Definition

Value Of Real Estate Acquired By Third Party Partially Financed By Entity

+ References

No definition available.

+ Details

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Namespace Prefix:	lxp_
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Period Type:	duration

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- Definition

Reflects the amount charged against earnings during the period as bad debt expense, net of recoveries of previously expensed credit losses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(d))

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 114

-Paragraph 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.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 9

-Section 03

-Paragraph 7

-Subparagraph d

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5212-111524

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- Definition

Reflects the aggregate gross carrying amount of all categories of loans and leases held in portfolio, prior to deducting deferred income and the allowance for losses on loans and leases.

+ References

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

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 01-6

-Paragraph 13

-Subparagraph e

-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.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522

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- Definition

The carrying amount of the outstanding balance due under the mortgage loan.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 948

-SubTopic 310

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-29)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Paragraph c

-Subparagraph Schedule IV

-Article 5

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 29

-Article 12

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule IV)

-URI http://asc.fasb.org/extlink&oid=6882300&loc=d3e5864-122674

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

The stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans.

+ References

+ Details

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Period Type:	duration

- Definition

The highest stated interest rate within the mortgage loans included in the loan grouping.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 948

-SubTopic 310

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-29.3)

-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule IV

-Article 5

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 29

-Article 12

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule IV)

-URI http://asc.fasb.org/extlink&oid=6882300&loc=d3e5864-122674

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- Definition

The lowest stated interest rate within the mortgage loans included in the loan grouping.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 948

-SubTopic 310

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-29.3)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule IV

-Article 5

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 29

-Article 12

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule IV)

-URI http://asc.fasb.org/extlink&oid=6882300&loc=d3e5864-122674

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- Definition

For an unclassified balance sheet, an amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money at a future date(s). Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

+ References

+ Details

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- Definition

For an unclassified balance sheet, an amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date, net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-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 210.5-02.3)

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

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- Definition

The cash outflow from the purchase of receivables arising from the mortgage note on real estate.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 15, 17

-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

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585

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- Definition

Allowance expensed for the period based on estimated losses to be realized from loan transactions.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 9

-Section 04

-Paragraph 11

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

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Chapter 5

-Paragraph 17

-IssueDate 2006-05-01

-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 Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.11)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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- Definition

Yield on the receivable, on which interest has been imputed, as calculated from its issuance value or purchase price. The calculated effective interest rate considers factors such as the issued face value or price paid for the receivable, the time period between payments, and the time until maturity [full receipt] of the receivable.

+ References

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

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 16

-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

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Loans Receivable (Details) (USD $) In Thousands, unless otherwise specified	1 Months Ended	2 Months Ended	3 Months Ended	12 Months Ended			22 Months Ended	3 Months Ended		12 Months Ended		3 Months Ended	12 Months Ended
	Dec. 31, 2010	Feb. 28, 2011	Jun. 30, 2011 properties	Dec. 31, 2011 ClassesOfFinancing TypesOfFinancing	Dec. 31, 2010 properties	Dec. 31, 2009 Loans	Dec. 31, 2011	Mar. 31, 2011 Vacant Industrial Property [Member]	Dec. 31, 2009 Discounted Payoff [Member]	Dec. 31, 2011 Minimum [Member]	Dec. 31, 2011 Maximum [Member]	Jun. 30, 2011 Lender Subsidiary [Member] Mezzanine [Member]	Dec. 31, 2010 Lender Subsidiary [Member] Mezzanine [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes, Loans and Financing Receivable, Net	$ 88,937			$ 66,619	$ 88,937		$ 66,619		$ 3,865
Receivable with Imputed Interest, Effective Yield (Interest Rate)										4.60%	16.00%
Payments to Acquire Mortgage Notes Receivable								3,003				10,000	17,000
Number Of Properties Representing Equity Interest Entity Received As Pledge From Borrower To Secure Notes Receivable			2
Percent Of Equity Interest Entity Received As Pledge From Borrower To Secure Notes Receivable												100.00%
Mortgage Loans on Real Estate, Minimum Interest Rate in Range		14.00%	15.00%
Mortgage Loans on Real Estate, Maximum Interest Rate in Range			18.50%				16.00%
Value Of Real Estate Acquired By Third Party Partially Financed By Entity								3,650
Mortgage Loans on Real Estate, Interest Rate				15.00%				7.80%
Loans and Leases Receivable, Gross, Carrying Amount				21,515			21,515
Fee For Extending Mortgage Loan Receivable By One Year Percent					0.50%
Average Annual Rent				3,968
Additional Contingent Loan				12,199			12,199
Number Of Real Estate Properties Financed By Entity					5
Proceeds From Prepayments Of Mortgage Notes Receivable	7,500
Mortgage Loans on Real Estate, Carrying Amount of Mortgages				9,500			9,500
Number Of Types Of Financing Receivable				2
Number Of Classes Of Financing Receivable				1
Loan Loss Recorded					3,756
Loans Receivable, Discounted Payoff, Number						2
Loans Receivable, Aggregate Carrying Value of Loans With Discounted Payoff									4,950
Allowance for Loan and Lease Losses, Provision for Loss, Net						$ 1,085