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Investments in Real Estate and Real Estate Under Construction - Additional Information (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 0 Months Ended
--- | --- | ---
Dec. 31, 2014 Property | Dec. 31, 2013 | Sep. 01, 2012
Investments in Real Estate and Real Estate Under Construction [Line Items] |  |  |
Below-market leases, net of accretion | $ 54,414 lxp_BelowMarketLeasesNetOfAccretion | $ 59,781 lxp_BelowMarketLeasesNetOfAccretion |
Future accretion, year 1 | 4,383 lxp_FutureAccretionYearOne |  |
Future accretion, year 2 | 3,312 lxp_FutureAccretionYearTwo |  |
Future accretion, year 3 | 2,918 lxp_FutureAccretionYearThree |  |
Future accretion, year 4 | 2,911 lxp_FutureAccretionYearFour |  |
Future accretion, year 5 | 2,603 lxp_FutureAccretionYearFive |  |
Acquisition related costs | 1,901 us-gaap_BusinessCombinationAcquisitionRelatedCosts | 1,349 us-gaap_BusinessCombinationAcquisitionRelatedCosts |
Investments in real estate under construction | 106,238 us-gaap_ConstructionInProgressGross | 74,350 us-gaap_ConstructionInProgressGross |
Number of real estate properties | 215 us-gaap_NumberOfRealEstateProperties |  |
Net Lease Strategic Assets Fund L P [Member] |  |  |
Investments in Real Estate and Real Estate Under Construction [Line Items] |  |  |
Payments to acquire businesses, gross |  |  | 9,438 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = lxp_NetLeaseStrategicAssetsFundLPMember
Equity interest in acquiree, remeasurement gain |  |  | 167,864 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain / us-gaap_BusinessAcquisitionAxis = lxp_NetLeaseStrategicAssetsFundLPMember
Development Deals [Member] |  |  |
Investments in Real Estate and Real Estate Under Construction [Line Items] |  |  |
Capitalized interest | $ 2,828 us-gaap_AccumulatedCapitalizedInterestCosts / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = lxp_DevelopmentDealsMember | $ 1,472 us-gaap_AccumulatedCapitalizedInterestCosts / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = lxp_DevelopmentDealsMember |

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- Definition Below-market Leases, Net of Accretion + References No definition available. + Details
Name: | lxp_BelowMarketLeasesNetOfAccretion
Namespace Prefix: | lxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Future Accretion, Year Five + References No definition available. + Details
Name: | lxp_FutureAccretionYearFive
Namespace Prefix: | lxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Future Accretion, Year Four + References No definition available. + Details
Name: | lxp_FutureAccretionYearFour
Namespace Prefix: | lxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Future Accretion, Year One + References No definition available. + Details
Name: | lxp_FutureAccretionYearOne
Namespace Prefix: | lxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Future Accretion, Year Three + References No definition available. + Details
Name: | lxp_FutureAccretionYearThree
Namespace Prefix: | lxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Future Accretion, Year Two + References No definition available. + Details
Name: | lxp_FutureAccretionYearTwo
Namespace Prefix: | lxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | lxp_InvestmentsInRealEstateAndRealEstateUnderConstructionLineItems
Namespace Prefix: | lxp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of accumulated interest costs capitalized as part of property, plant and equipment cost basis. + References No definition available. + Details
Name: | us-gaap_AccumulatedCapitalizedInterestCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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
Name: | us-gaap_BusinessCombinationAcquisitionRelatedCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
Name: | us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
Name: | us-gaap_ConstructionInProgressGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfRealEstateProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquireBusinessesGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=lxp_NetLeaseStrategicAssetsFundLPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=lxp_DevelopmentDealsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |