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Senior Notes, Convertible Notes, Exchangeable Notes and Trust Preferred Securities - Schedule of Long-term Debt Instruments (Details) (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2010 | Dec. 31, 2007
6.00% Convertible Guaranteed Note [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt interest rate percentage | 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lxp_SixPercentConvertibleGuaranteedNoteMember | 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lxp_SixPercentConvertibleGuaranteedNoteMember | 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lxp_SixPercentConvertibleGuaranteedNoteMember | 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lxp_SixPercentConvertibleGuaranteedNoteMember |
Face Amount | $ 16,228,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = lxp_SixPercentConvertibleGuaranteedNoteMember | $ 28,991,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = lxp_SixPercentConvertibleGuaranteedNoteMember |  | $ 115,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = lxp_SixPercentConvertibleGuaranteedNoteMember |
Unamortized discount | (564,000)us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = lxp_SixPercentConvertibleGuaranteedNoteMember | (1,500,000)us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = lxp_SixPercentConvertibleGuaranteedNoteMember |  |  |
Carrying amount of debt component | 15,664,000 lxp_DebtInstrumentCarryingAmountOfDebt / us-gaap_LongtermDebtTypeAxis = lxp_SixPercentConvertibleGuaranteedNoteMember | 27,491,000 lxp_DebtInstrumentCarryingAmountOfDebt / us-gaap_LongtermDebtTypeAxis = lxp_SixPercentConvertibleGuaranteedNoteMember |  |  |
Carrying amount of equity component | (33,160,000)us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent / us-gaap_LongtermDebtTypeAxis = lxp_SixPercentConvertibleGuaranteedNoteMember | (26,032,000)us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent / us-gaap_LongtermDebtTypeAxis = lxp_SixPercentConvertibleGuaranteedNoteMember |  |  |
Effective interest rate | 8.10%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = lxp_SixPercentConvertibleGuaranteedNoteMember | 8.10%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = lxp_SixPercentConvertibleGuaranteedNoteMember |  |  |
Aggregate if-converted value in excess of aggregate principal amount | 10,432,000 us-gaap_DebtInstrumentConvertibleIfConvertedValueInExcessOfPrincipal / us-gaap_LongtermDebtTypeAxis = lxp_SixPercentConvertibleGuaranteedNoteMember | 14,296,000 us-gaap_DebtInstrumentConvertibleIfConvertedValueInExcessOfPrincipal / us-gaap_LongtermDebtTypeAxis = lxp_SixPercentConvertibleGuaranteedNoteMember |  |  |
Coupon interest | 1,545,000 us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = lxp_SixPercentConvertibleGuaranteedNoteMember | 2,296,000 us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = lxp_SixPercentConvertibleGuaranteedNoteMember | 6,634,000 us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = lxp_SixPercentConvertibleGuaranteedNoteMember |  |
Discount amortization | 438,000 us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_LongtermDebtTypeAxis = lxp_SixPercentConvertibleGuaranteedNoteMember | 658,000 us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_LongtermDebtTypeAxis = lxp_SixPercentConvertibleGuaranteedNoteMember | 1,868,000 us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_LongtermDebtTypeAxis = lxp_SixPercentConvertibleGuaranteedNoteMember |  |
Interest Expense | 1,983,000 us-gaap_InterestExpenseDebt / us-gaap_LongtermDebtTypeAxis = lxp_SixPercentConvertibleGuaranteedNoteMember | 2,954,000 us-gaap_InterestExpenseDebt / us-gaap_LongtermDebtTypeAxis = lxp_SixPercentConvertibleGuaranteedNoteMember | 8,502,000 us-gaap_InterestExpenseDebt / us-gaap_LongtermDebtTypeAxis = lxp_SixPercentConvertibleGuaranteedNoteMember |  |
5.45% Exchangeable Guaranteed Note [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt interest rate percentage |  |  |  |  | 5.45%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lxp_FivePointFourFivePercentExchangeableGuaranteedNoteMember
Face Amount |  |  |  |  | 450,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = lxp_FivePointFourFivePercentExchangeableGuaranteedNoteMember
Coupon interest | 0 us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = lxp_FivePointFourFivePercentExchangeableGuaranteedNoteMember | 0 us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = lxp_FivePointFourFivePercentExchangeableGuaranteedNoteMember | 188,000 us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = lxp_FivePointFourFivePercentExchangeableGuaranteedNoteMember |  |
Discount amortization | 0 us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_LongtermDebtTypeAxis = lxp_FivePointFourFivePercentExchangeableGuaranteedNoteMember | 0 us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_LongtermDebtTypeAxis = lxp_FivePointFourFivePercentExchangeableGuaranteedNoteMember | 34,000 us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_LongtermDebtTypeAxis = lxp_FivePointFourFivePercentExchangeableGuaranteedNoteMember |  |
Interest Expense | $ 0 us-gaap_InterestExpenseDebt / us-gaap_LongtermDebtTypeAxis = lxp_FivePointFourFivePercentExchangeableGuaranteedNoteMember | $ 0 us-gaap_InterestExpenseDebt / us-gaap_LongtermDebtTypeAxis = lxp_FivePointFourFivePercentExchangeableGuaranteedNoteMember | $ 222,000 us-gaap_InterestExpenseDebt / us-gaap_LongtermDebtTypeAxis = lxp_FivePointFourFivePercentExchangeableGuaranteedNoteMember |  |

X
- Definition Debt Instrument Carrying Amount of Debt + References No definition available. + Details
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Namespace Prefix: | lxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 + Details
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Balance Type: | debit
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X
- Definition The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031897-161870 + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition The amount by which the convertible debt's if-converted value exceeds its principle amount at the balance sheet date, regardless of whether the instrument is currently convertible. This element applies to public companies only. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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Balance Type: | credit
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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
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Balance Type: | credit
Period Type: | instant

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: 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
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
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
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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- Details
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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 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
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Balance Type: | debit
Period Type: | instant

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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 + Details
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Balance Type: | debit
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- Details
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