Equity - Effects of Changes in Noncontrolling Interests (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Equity [Abstract]
Net income attributable to Lexington Realty Trust shareholders	$ 6,638	$ 41,904	$ 120,358	$ 78,924
Transfers from noncontrolling interests:
Increase in additional paid-in-capital for reallocation of noncontrolling interests			435	0
Increase in additional paid-in-capital for redemption of noncontrolling OP units			670	632
Change from net income attributable to shareholders and transfers from noncontrolling interests			$ 121,463	$ 79,556