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Sales of Real Estate and Discontinued Operations (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 acre properties	Dec. 31, 2011 properties	Dec. 31, 2010 properties
Real Estate and Discontinued Operations [Abstract]
Real estate number of properties sold (in # of properties)	14	17	13
Area of real estate sold (acres)	6.9
Aggregate gross disposition price	$ 142,022	$ 124,039	$ 80,224
Aggregate Gain on Sales of Properties	13,291	6,557	14,613
Debt satisfaction gains (charges), net	(178)	(606)	2,924
Properties classified as held-for-sale (in # of properties)	0	0
Total gross revenues	7,892	22,718	46,572
Pre-tax loss, including gains on sale	$ 5,943	$ (70,591)	$ (29,339)

X

- Definition

Amount represents the difference between the fair value of the payments made and the carrying amount of the debt at the time of its extinguishment for assets classifed in discontinued operations.

+ References

No definition available.

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Period Type:	duration

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- Details

Name:	lxp_RealEstateAndDiscontinuedOperationsAbstract
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X

- Definition

Real Estate Area Of Real Estate Sold

+ References

No definition available.

+ Details

Name:	lxp_RealEstateAreaOfRealEstateSold
Namespace Prefix:	lxp_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Real Estate Disposition Price

+ References

No definition available.

+ Details

Name:	lxp_RealEstateDispositionPrice
Namespace Prefix:	lxp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

Real Estate Number Of Properties Sold

+ References

No definition available.

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Namespace Prefix:	lxp_
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Balance Type:	na
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X

- Definition

Real Estate Properties Held For Sale

+ References

No definition available.

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Balance Type:	na
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X

- Definition

Amount of operating income or loss attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760

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X

- Definition

Amount of sales or other form of revenues attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 144

-Paragraph 47

-Subparagraph c

-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 205

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760

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- Definition

The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-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 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

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