Stockholders' Equity of the Company - Additional Information (Details) - $ / shares	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Equity, Class of Treasury Stock [Line Items]
Authorized capital stock (shares)	260,000,000
Authorized shares, par value (in dollars per share)	$ 0.01
Common stock, shares authorized (in shares)	160,000,000		160,000,000
Common stock, par value (in dollars per share)	$ 0.01		$ 0.01
Excess stock, shares authorized (in shares)	75,000,000
Excess stock, par value (in dollars per share)	$ 0.01
Preferred stock, shares authorized (in shares)	25,000,000
Preferred stock, par value (in dollars per share)	$ 0.01
Excess shares issued (in shares)	0
Excess shares outstanding (in shares)	0
Common stock shares excluded from the diluted shares outstanding (in shares)	7,375,635	6,262,427
Series I Preferred Stock
Equity, Class of Treasury Stock [Line Items]
Preferred stock, par value (in dollars per share)	$ 0.01		$ 0.01
SL Green Operating Partnership
Equity, Class of Treasury Stock [Line Items]
Shares, outstanding (in shares)	71,123,984
Shares, issued (in shares)	71,123,984
Common stock shares excluded from the diluted shares outstanding (in shares)	2,395,646	2,159,695