Equity - Effects of Changes in Noncontrolling Interests (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Equity [Abstract]
Net income (loss) attributable to Lexington Realty Trust shareholders	$ 23,333	$ (1,694)	$ 51,360	$ (16,009)
Transfers from noncontrolling interests:
Increase in additional paid-in-capital for redemption of noncontrolling OP units			161	63
Change from net income (loss) attributable to shareholders and transfers from noncontrolling interests			$ 51,521	$ (15,946)