Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (38,357)	$ 13,485
Other comprehensive (loss) income:
(Decrease) increase in unrealized value of derivative instruments, including SL Green's share of joint venture derivative instruments	(31,059)	43,567
Decrease in unrealized value of marketable securities	(968)	(1,793)
Other comprehensive (loss) income	(32,027)	41,774
Comprehensive (loss) income	(70,384)	55,259
Net loss (income) attributable to noncontrolling interests and preferred units distributions	2,364	(1,996)
Other comprehensive loss (income) attributable to noncontrolling interests	1,851	(2,277)
Comprehensive (loss) income attributable to SL Green	$ (66,169)	$ 50,986