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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2012
Net Lease Strategic Assets Fund L P [Member] |  |
Business Acquisition [Line Items] |  |
Gross revenues | $ 92,035 | $ 271,258
Net income (loss) attributable to Lexington Realty Trust shareholders | 916 | (5,552)
Net loss attributable to common shareholders | $ (3,737) | $ (23,906)
Net loss per common share - basic and diluted | $ (0.02) | $ (0.15)

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