Equity - Effects of Changes in Noncontrolling Interests (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Equity [Abstract]
Net income attributable to Lexington Realty Trust shareholders	$ 18,866	$ 23,333	$ 37,020	$ 51,360
Transfers from noncontrolling interests:
Increase in additional paid-in-capital for redemption of noncontrolling OP units			482	161
Change from net income attributable to shareholders and transfers from noncontrolling interests			$ 37,502	$ 51,521