CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 43,618	$ 147,821	$ 81,169	$ 199,870
Other comprehensive income (loss):
Change in unrealized income (loss) on interest rate swaps, net	1,043	(5,549)	(17,759)	(5,625)
Other comprehensive income (loss)	1,043	(5,549)	(17,759)	(5,625)
Comprehensive income	44,661	142,272	63,410	194,245
Comprehensive income attributable to noncontrolling interests	(1,714)	(4,502)	(2,245)	(5,191)
Comprehensive income attributable to Lexington Realty Trust shareholders	$ 42,947	$ 137,770	$ 61,165	$ 189,054