Equity - Effects of Changes in Noncontrolling Interests (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Equity [Abstract]
Net income attributable to Lexington Realty Trust shareholders	$ 41,042	$ 18,154
Transfers from noncontrolling interests:
Increase in additional paid-in-capital for redemption of noncontrolling OP units	311	428
Change from net income attributable to shareholders and transfers from noncontrolling interests	$ 41,353	$ 18,582