Equity - Changes in Company's Ownership Interests (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Equity [Line Items]
Net income attributable to Lexington Realty Trust shareholders	$ 49,332	$ 14,450	$ 82,837	$ 15,336
Decrease in additional paid-in-capital for redemption of noncontrolling OP units			0	(959)
Change from net income attributable to shareholders and transfers from noncontrolling interests			82,837	14,377
Accumulated Distributions in Excess of Net Income [Member]
Equity [Line Items]
Net income attributable to Lexington Realty Trust shareholders			$ 82,837	$ 15,336