Stockholders' Equity of the Company - Additional Information (Details) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Equity, Class of Treasury Stock [Line Items]
Authorized capital stock (shares)	260,000,000		260,000,000
Authorized shares, par value (in dollars per share)	$ 0.01		$ 0.01
Common stock, shares authorized (in shares)	160,000,000		160,000,000		160,000,000
Common stock, par value (in dollars per share)	$ 0.01		$ 0.01		$ 0.01
Excess stock, shares authorized (shares)	75,000,000		75,000,000
Excess stock, par value (in dollars per share)	$ 0.01		$ 0.01
Preferred stock, shares authorized (shares)	25,000,000		25,000,000
Preferred stock, par value (in dollars per share)	$ 0.01		$ 0.01
Excess shares issued (shares)	0		0
Excess shares outstanding (in shares)	0		0
Share repurchased (in shares)			0
Common stock shares excluded from the diluted shares outstanding (shares)	352,917	1,574,571	352,917	135,000
Series I Preferred Stock
Equity, Class of Treasury Stock [Line Items]
Preferred stock, par value (in dollars per share)	$ 0.01		$ 0.01		$ 0.01
Preferred stock, dividends (in dollars per share)			$ 1.625
Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Share repurchased (in shares)			36,107,719
SL Green Operating Partnership
Equity, Class of Treasury Stock [Line Items]
Shares, outstanding (in shares)	71,024,627		71,024,627
Shares, issued (in shares)	71,024,627		71,024,627
Common stock shares excluded from the diluted shares outstanding (shares)	352,917	1,574,571	352,917	135,000
SL Green Operating Partnership | Series I Preferred Stock
Equity, Class of Treasury Stock [Line Items]
Shares, outstanding (in shares)	9,200,000		9,200,000