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Sales of Real Estate and Discontinued Operations (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 Property | Dec. 31, 2013 Property | Dec. 31, 2012
Discontinued Operations and Disposal Groups [Abstract] |  |  |
Aggregate gross disposition price | $ 226,375 lxp_RealEstateDispositionPrice | $ 75,519 lxp_RealEstateDispositionPrice | $ 142,022 lxp_RealEstateDispositionPrice
Aggregate gain on sale of properties | 57,507 us-gaap_GainLossOnSaleOfProperties | 24,472 us-gaap_GainLossOnSaleOfProperties | 13,291 us-gaap_GainLossOnSaleOfProperties
Debt satisfaction gains (charges), net | (312)lxp_DiscontinuedOperationsGainLossOnDebtExtinguishmentNet | 8,905 lxp_DiscontinuedOperationsGainLossOnDebtExtinguishmentNet | (206)lxp_DiscontinuedOperationsGainLossOnDebtExtinguishmentNet
Properties classified as held-for-sale (in number of properties) | 1 lxp_RealEstatePropertiesHeldForSale | 0 lxp_RealEstatePropertiesHeldForSale |
Total gross revenues | 20,250 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue | 44,108 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue | 55,763 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
Pre-tax net income, including gains on sales | $ 49,680 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss | $ 26,701 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss | $ 702 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss

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- 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 classified in discontinued operations. + References No definition available. + Details
Name: | lxp_DiscontinuedOperationsGainLossOnDebtExtinguishmentNet
Namespace Prefix: | lxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Real Estate Disposition Price + References No definition available. + Details
Name: | lxp_RealEstateDispositionPrice
Namespace Prefix: | lxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Real Estate Properties Held For Sale + References No definition available. + Details
Name: | lxp_RealEstatePropertiesHeldForSale
Namespace Prefix: | lxp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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 + Details
Name: | us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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 Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
Name: | us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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 Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
Name: | us-gaap_GainLossOnSaleOfProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration