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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012
Net Lease Strategic Assets Fund L P [Member] |  |
Business Acquisition [Line Items] |  |
Gross revenues | $ 92,795 | $ 181,650
Net income (loss) attributable to Lexington Realty Trust shareholders | 7 | (4,837)
Net loss attributable to common shareholders | $ (7,896) | $ (18,538)
Net loss per common share - basic and diluted | $ (0.05) | $ (0.12)

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