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Investments in Real Estate and Real Estate Under Construction - Narrative (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Business Acquisition [Line Items] |  |  |
Aggregate acquisition expenses | $ 468 us-gaap_BusinessCombinationAcquisitionRelatedCosts | $ 368 us-gaap_BusinessCombinationAcquisitionRelatedCosts |
Development in process | 125,571 us-gaap_DevelopmentInProcess |  | 106,238 us-gaap_DevelopmentInProcess
Development Deals [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Capitalized interest | $ 4,106 us-gaap_InterestCostsCapitalized / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = lxp_DevelopmentDealsMember |  | $ 2,828 us-gaap_InterestCostsCapitalized / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = lxp_DevelopmentDealsMember

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- 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=34752592&loc=d3e1043-128460 + Details
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- 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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- Definition Amount of interest capitalized during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Allowance for Funds Used during Construction -URI http://asc.fasb.org/extlink&oid=6504829 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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