Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ (37,949)	$ 117,134	$ (24,464)	$ 113,279
Other comprehensive loss:
Increase (decrease) in unrealized value of derivative instruments, including SL Green's share of joint venture derivative instruments	17,323	(51,313)	60,890	(50)
(Decrease) increase in unrealized value of marketable securities	(454)	506	(2,247)	248
Other comprehensive income (loss)	16,869	(50,807)	58,643	198
Comprehensive (loss) income	(21,080)	66,327	34,179	113,477
Net income attributable to noncontrolling interests and preferred units distributions	(2,190)	(8,065)	(4,186)	(7,936)
Other comprehensive (income) loss attributable to noncontrolling interests	(1,013)	2,841	(3,290)	186
Comprehensive (loss) income attributable to SL Green	$ (24,283)	$ 61,103	$ 26,703	$ 105,727