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Benefit Plans - Additional Information (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended | 0 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2010 | Jan. 08, 2010 | Dec. 31, 2008 | Dec. 31, 2011
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |
Common Stock, Shares Held in Employee Trust, Shares | 427,531 us-gaap_CommonStockSharesHeldInEmployeeTrustShares | 427,531 us-gaap_CommonStockSharesHeldInEmployeeTrustShares |  |  |  |  |
Common share options granted (shares) | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross |  |  |  |
Recognized compensation expense | $ 1,038 us-gaap_StockOptionPlanExpense | $ 1,037 us-gaap_StockOptionPlanExpense | $ 1,197 us-gaap_StockOptionPlanExpense |  |  |  |
Exercises in period, intrinsic value | 2,780 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | 8,607 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | 1,603 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue |  |  |  |
Options, exercisable, intrinsic value | 4,557 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 |  |  |  |  |  |
Initial vesting percentage | 25.00%lxp_InitialVestingPercentage |  |  |  |  |  |
Vesting percentage | 100.00%lxp_VestingPercentage |  |  |  |  |  |
Cost recognized | 299 us-gaap_DefinedContributionPlanCostRecognized | 298 us-gaap_DefinedContributionPlanCostRecognized | 279 us-gaap_DefinedContributionPlanCostRecognized |  |  |  |
Allocated share-based compensation expense | 7,550 us-gaap_AllocatedShareBasedCompensationExpense | 7,145 us-gaap_AllocatedShareBasedCompensationExpense | 3,030 us-gaap_AllocatedShareBasedCompensationExpense |  |  |  |
Non-vested Shares [Member] |  |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |
Unrecognized compensation costs | 15,183 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = lxp_NonVestedSharesMember |  |  |  |  |  |
Non-options, nonvested, number | 1,970,385 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = lxp_NonVestedSharesMember | 2,521,046 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = lxp_NonVestedSharesMember | 1,465,446 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = lxp_NonVestedSharesMember |  |  |  |
Number of shares available for grant | 4,012,252 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_AwardTypeAxis = lxp_NonVestedSharesMember |  |  |  |  |  |
Total compensation cost not yet recognized, period for recognition | 4 years |  |  |  |  |  |
Options 2010 [Member] |  |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |
Common share options granted (shares) |  |  |  | 1,248,501 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = lxp_Options2010Member |  |  |
Common share options exercise price (usd per share) |  |  |  | $ 7.95 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = lxp_Options2010Member |  |  |
Deferred compensation equity | 2,422 us-gaap_DeferredCompensationEquity / us-gaap_AwardTypeAxis = lxp_Options2010Member |  |  |  |  |  |
Options 2009 [Member] |  |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |
Common share options granted (shares) |  |  |  |  | 1,265,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = lxp_Options2009Member |  |
Common share options exercise price (usd per share) |  |  |  |  | $ 6.39 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = lxp_Options2009Member |  |
Vesting rate |  |  |  |  | 20.00%lxp_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingRate / us-gaap_AwardTypeAxis = lxp_Options2009Member |  |
Deferred compensation equity | 2,771 us-gaap_DeferredCompensationEquity / us-gaap_AwardTypeAxis = lxp_Options2009Member |  |  |  |  |  |
Recognized compensation expense average period | 5 years |  |  |  |  |  |
Options 2008 [Member] |  |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |
Common share options granted (shares) |  |  |  |  |  | 2,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = lxp_Options2008Member |
Common share options exercise price (usd per share) |  |  |  |  |  | $ 5.60 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = lxp_Options2008Member |
Number of trading period days |  |  |  |  |  | 20 days |
Options convertible to common shares |  |  |  |  |  | 1.13 lxp_ShareBasedCompensationArrangementbyShareBasedPaymentAwardOptionsConvertibleToCommonShares / us-gaap_AwardTypeAxis = lxp_Options2008Member |
Options converted to common shares exercise price |  |  |  |  |  | $ 4.97 lxp_OptionsConvertedToCommonSharesExercisePrice / us-gaap_AwardTypeAxis = lxp_Options2008Member |
Deferred compensation equity | 2,480 us-gaap_DeferredCompensationEquity / us-gaap_AwardTypeAxis = lxp_Options2008Member |  |  |  |  |  |
Recognized compensation expense average period | 3 years 7 months 6 days |  |  |  |  |  |
Options 2008 [Member] | Minimum [Member] |  |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |
Average closing price, lower limit |  |  |  |  |  | $ 8 lxp_StatedLowerAmountWhereEntitysAverageClosingPricePerCommonShareIsGreaterThanTheStatedAmountTriggering / us-gaap_AwardTypeAxis = lxp_Options2008Member / us-gaap_RangeAxis = us-gaap_MinimumMember |
Options 2008 [Member] | Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |
Average closing price, lower limit |  |  |  |  |  | $ 10 lxp_StatedLowerAmountWhereEntitysAverageClosingPricePerCommonShareIsGreaterThanTheStatedAmountTriggering / us-gaap_AwardTypeAxis = lxp_Options2008Member / us-gaap_RangeAxis = us-gaap_MaximumMember |
Options 2008 [Member] | Share Based Compensation Arrangement By Share Based Payment Award Vesting Rate First Vesting Trigger [Member] |  |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |
Vesting rate |  |  |  |  |  | 50.00%lxp_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingRate / us-gaap_AwardTypeAxis = lxp_Options2008Member / lxp_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardVestingAxis = lxp_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingRateFirstVestingTriggerMember |
Employee Stock Option [Member] |  |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |
Common share options exercise price (usd per share) | $ 7.05 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 6.95 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 6.44 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  | $ 6.36 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Vesting rate |  |  |  | 20.00%lxp_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |
Unrecognized compensation costs | $ 480 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |
Shares Subject to Time [Member] |  |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |
Non-options, nonvested, number | 1,895,245 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = lxp_SharesSubjectToTimeMember |  |  |  |  |  |
Shares Subject to Performance [Member] |  |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |
Non-options, nonvested, number | 75,140 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = lxp_SharesSubjectToPerformanceMember |  |  |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Number of common stock held in a trust that has been set up specifically to accumulate stock for the sole purpose of distribution to participating employees but not yet earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 25 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6418455&loc=d3e16701-113920 + Details
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- Definition Value of stock issued under share-based plans to employees or officers which is the unearned portion, accounted for under the fair value method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415241&loc=d3e4534-113899 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 210.5-02.30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation. + References Reference 1: 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 + Details
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