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Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012
Summary of Significant Accounting Policies [Line Items] |
Tenant Purchase Requirement, Minimum | $ 10,710
Tenant Purchase Requirement Maximum | 11,550
Required Tenant Purchase Price | $ 10,710
Building and Building Improvements [Member] |
Summary of Significant Accounting Policies [Line Items] |
Property, Land and Equipment, Useful Life, Maximum (in years) | 40

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- Definition Required Tenant Purchase Price + References No definition available. + Details
Name: | lxp_RequiredTenantPurchasePrice
Namespace Prefix: | lxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | lxp_SummaryOfSignificantAccountingPoliciesLineItems
Namespace Prefix: | lxp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Tenant Purchase Requirement Maximum + References No definition available. + Details
Name: | lxp_TenantPurchaseRequirementMaximum
Namespace Prefix: | lxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Tenant Purchase Requirement Minimum + References No definition available. + Details
Name: | lxp_TenantPurchaseRequirementMinimum
Namespace Prefix: | lxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The maximum useful life of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLifeMaximum
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration