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Schedule III - Real Estate and Accumulated Depreciation and Amortization - Summary (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract] |  |  |
Total cost basis for federal income tax purposes | $ 4,400,000,000 us-gaap_RealEstateFederalIncomeTaxBasis |  |
Reconciliation of real estate owned: |  |  |
Balance at the beginning of year | 3,812,294,000 us-gaap_RealEstateGrossAtCarryingValue | 3,564,466,000 us-gaap_RealEstateGrossAtCarryingValue | 3,172,246,000 us-gaap_RealEstateGrossAtCarryingValue
Additions during year | 210,143,000 lxp_RealEstateAdditions | 492,437,000 lxp_RealEstateAdditions | 540,847,000 lxp_RealEstateAdditions
Properties sold during year | (282,143,000)lxp_RealEstatePropertiesSold | (212,771,000)lxp_RealEstatePropertiesSold | (138,041,000)lxp_RealEstatePropertiesSold
Properties impaired during the year | (65,426,000)lxp_RealEstatePropertiesImpaired | (31,741,000)lxp_RealEstatePropertiesImpaired | (10,553,000)lxp_RealEstatePropertiesImpaired
Other reclassifications | (3,308,000)lxp_RealEstateOtherReclassifications | (97,000)lxp_RealEstateOtherReclassifications | (33,000)lxp_RealEstateOtherReclassifications
Balance at end of year | 3,671,560,000 us-gaap_RealEstateGrossAtCarryingValue | 3,812,294,000 us-gaap_RealEstateGrossAtCarryingValue | 3,564,466,000 us-gaap_RealEstateGrossAtCarryingValue
Reconciliation of accumulated depreciation and amortization: |  |  |
Balance at the beginning of year | 775,617,000 us-gaap_RealEstateAccumulatedDepreciation | 738,068,000 us-gaap_RealEstateAccumulatedDepreciation | 638,368,000 us-gaap_RealEstateAccumulatedDepreciation
Depreciation and amortization expense | 119,156,000 us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense | 122,057,000 us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense | 119,067,000 us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense
Accumulated depreciation and amortization of properties sold, impaired and held for sale during year | (98,698,000)us-gaap_RealEstateAccumulatedDepreciationOtherDeductions | (84,508,000)us-gaap_RealEstateAccumulatedDepreciationOtherDeductions | (19,367,000)us-gaap_RealEstateAccumulatedDepreciationOtherDeductions
Other reclassifications | (589,000)lxp_RealEstateAccumulatedDepreciationOtherReclassifications | 0 lxp_RealEstateAccumulatedDepreciationOtherReclassifications | 0 lxp_RealEstateAccumulatedDepreciationOtherReclassifications
Balance at end of year | $ 795,486,000 us-gaap_RealEstateAccumulatedDepreciation | $ 775,617,000 us-gaap_RealEstateAccumulatedDepreciation | $ 738,068,000 us-gaap_RealEstateAccumulatedDepreciation

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- Definition Amount of accumulated depreciation pertaining to real estate investments for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28.FN4) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 Reference 2: 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 III) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 28 -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5 + Details
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- Definition Amount of other deductions to accumulated depreciation, excluding sales, for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28.FN4) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 Reference 2: 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 III) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 28 -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5 + Details
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