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Senior Notes, Convertible Notes, Exchangeable Notes and Trust Preferred Securities - Schedule of Debt Instrument Redemptions (Details) (USD $) | Dec. 31, 2014
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Senior Notes [Member] |
Debt Instrument, Redemption [Line Items] |
Face Amount | $ 500,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember
4.40% Senior Note [Member] | Senior Notes Due 2024 [Member] |
Debt Instrument, Redemption [Line Items] |
Face Amount | 250,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = lxp_SeniorNotesDue2024Member / us-gaap_LongtermDebtTypeAxis = lxp_FourPointFourPercentSeniorNoteMember
Interest Rate | 4.40%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lxp_SeniorNotesDue2024Member / us-gaap_LongtermDebtTypeAxis = lxp_FourPointFourPercentSeniorNoteMember
Issue Price | 99.883%lxp_DebtInstrumentPercentageofIssuancePrice / us-gaap_DebtInstrumentAxis = lxp_SeniorNotesDue2024Member / us-gaap_LongtermDebtTypeAxis = lxp_FourPointFourPercentSeniorNoteMember
4.25% Senior Note [Member] | Senior Notes Due 2023 [Member] |
Debt Instrument, Redemption [Line Items] |
Face Amount | $ 250,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = lxp_SeniorNotesDue2023Member / us-gaap_LongtermDebtTypeAxis = lxp_FourPointTwoFivePercentSeniorNoteMember
Interest Rate | 4.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lxp_SeniorNotesDue2023Member / us-gaap_LongtermDebtTypeAxis = lxp_FourPointTwoFivePercentSeniorNoteMember
Issue Price | 99.026%lxp_DebtInstrumentPercentageofIssuancePrice / us-gaap_DebtInstrumentAxis = lxp_SeniorNotesDue2023Member / us-gaap_LongtermDebtTypeAxis = lxp_FourPointTwoFivePercentSeniorNoteMember

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- Definition Debt Instrument, Percentage of Issuance Price + References No definition available. + Details
Name: | lxp_DebtInstrumentPercentageofIssuancePrice
Namespace Prefix: | lxp_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

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- Details
Name: | us-gaap_DebtInstrumentAxis=us-gaap_SeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=lxp_FourPointFourPercentSeniorNoteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=lxp_FourPointTwoFivePercentSeniorNoteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |