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Investments in Real Estate and Real Estate Under Construction - Acquisition, Pro Forma (Details) (Net Lease Strategic Assets Fund L P [Member], USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
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Mar. 31, 2012
Net Lease Strategic Assets Fund L P [Member] |
Business Acquisition [Line Items] |
Gross revenues | $ 89,674
Net loss attributable to Lexington Realty Trust shareholders | (4,844)
Net loss attributable to common shareholders | $ (10,642)
Net loss per common share - basic and diluted | $ (0.07)

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