Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (599,337)	$ (76,303)	$ 480,632
Other comprehensive (loss) income:
(Decrease) increase in unrealized value of derivative instruments, including SL Green's share of joint venture derivative instruments	(32,437)	103,629	21,427
(Decrease) increase in unrealized value of marketable securities	(1,650)	(1,440)	104
Other comprehensive (loss) income	(34,087)	102,189	21,531
Comprehensive (loss) income	(633,424)	25,886	502,163
Net loss (income) attributable to noncontrolling interests and preferred units distributions	34,778	(1,771)	(30,878)
Other comprehensive loss (income) attributable to noncontrolling interests	1,960	(5,827)	(1,042)
Comprehensive income attributable to SL Green/SLGOP	$ (596,686)	$ 18,288	$ 470,243