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Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified | 0 Months Ended | 3 Months Ended | 12 Months Ended |  | 0 Months Ended | 1 Months Ended | 12 Months Ended |  | 0 Months Ended | 1 Months Ended |  |
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Jul. 11, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Dec. 31, 2012 | Jun. 30, 2006 | Jul. 11, 2012 Farmington Hills Claim [Member] | Apr. 28, 2012 Farmington Hills Claim [Member] | Jun. 30, 2006 Farmington Hills Claim [Member] | Dec. 31, 2012 Farmington Hills Claim [Member] | Oct. 12, 2007 Farmington Hills Claim [Member] | Apr. 28, 2012 Antioch Claim [Member] | Jun. 30, 2006 Antioch Claim [Member] | Oct. 12, 2007 Antioch Claim [Member] | Dec. 31, 2012 Base Building Improvements [Member] | Dec. 31, 2012 Tenant Improvement Allowance [Member]
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitment |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,414 | $ 5,567
Bankruptcy claims amount of claims filed |  |  |  |  |  |  |  | 7,680 |  |  |  | 7,727 |  |  |
Bankruptcy claims sold for amount |  |  |  |  |  |  |  | 5,376 |  |  |  | 5,680 |  |  |
Guarantee obligation penalty interest rate per annum |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |
Loss Contingency, Settlement Agreement, Damages Not Including Interest and Expenses |  |  |  |  |  | 826 |  |  |  |  | 388 |  |  |  |
Loss Contingency, Settlement Agreement, Interest Rate Per Annum |  |  |  |  |  | 10.00% |  |  |  |  | 10.00% |  |  |  |
Loss Contingency, Settlement Agreement, Damages, Prejudgement Interest |  |  |  |  |  |  | 482 |  |  |  | 226 |  |  |  |
Loss Contingency, Settlement Agreement, Statutory Interest Rate Per Annum |  |  |  |  |  |  | 9.00% |  |  |  | 9.00% |  |  |  |
Litigation Settlement, Expense | 827 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency Accrual, Carrying Value, Provision |  | 2,775 | 2,800 |  |  |  |  |  |  |  |  |  |  |  |
Bankruptcy claims amount of claims settled |  |  |  |  |  |  |  |  |  | 6,500 |  |  | 7,200 |  |
Formal claim demand |  |  |  |  |  |  |  |  | 826 |  |  |  |  |  |
Claimed damages not including interest and expenses |  |  |  |  |  |  |  |  | 1,200 |  |  |  |  |  |
Lease termination payment |  |  |  | $ 19,910 |  |  |  |  |  |  |  |  |  |  |

X
- Definition Bankruptcy Claims Sold For Amount + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Claimed Damages Not Including Interest and Expenses + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Details
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Data Type: | xbrli:stringItemType
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- Definition Formal Claim Demand + References No definition available. + Details
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Namespace Prefix: | lxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Guarantee Obligation Penalty Interest Rate Per Annum + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- Definition Lease Termination Payment + References No definition available. + Details
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Namespace Prefix: | lxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Loss Contingency, Settlement Agreement, Damages Not Including Interest and Expenses + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Loss Contingency, Settlement Agreement, Damages, Prejudgement Interest + References No definition available. + Details
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Namespace Prefix: | lxp_
Data Type: | xbrli:monetaryItemType
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- Definition Loss Contingency, Settlement Agreement, Interest Rate Per Annum + References No definition available. + Details
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Namespace Prefix: | lxp_
Data Type: | num:percentItemType
Balance Type: | na
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- Definition Loss Contingency, Settlement Agreement, Statutory Interest Rate Per Annum + References No definition available. + Details
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Namespace Prefix: | lxp_
Data Type: | num:percentItemType
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- Definition Other Commitment + References No definition available. + Details
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Balance Type: | credit
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- Definition The aggregate dollar amount of claims filed with the bankruptcy court. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 90-7 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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Balance Type: | credit
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- Definition The aggregate dollar amount of claims settled. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 90-7 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition This element represents the expenses incurred by the entity which are directly related and attributable to receiving an award in settlement of litigation. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition The charge against earnings in the period to increase loss contingency liabilities, net of any adjustments to reduce previously estimated charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9, 10, 11, 12 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14326-108349 + Details
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