Stockholders' Equity of the Company - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Nov. 30, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Class of Stock [Line Items]
Authorized capital stock (in 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	$ 0.01
Excess stock, shares authorized (shares)		75,000,000
Excess stock, par value (in dollars per share)		$ 0.01
Preferred stock, shares authorized (shares)		25,000,000
Preferred stock, par (in dollars per share)		$ 0.01
Excess shares issued (shares)		0
Excess shares outstanding (in shares)		0
Number of shares issued (in shares)	5,063,291
Share price (in dollars per share)	$ 79.00
Proceeds from issuance of common stock	$ 386,300	$ 386,790	$ 0	$ 0
Limited partner interests in Operating Partnership, limited partner common units outstanding (shares)	5,063,291
SL Green Operating Partnership
Class of Stock [Line Items]
Limited partner interests in Operating Partnership, limited partner common units outstanding (shares)		4,510,000	3,949,000
Common Stock
Class of Stock [Line Items]
Shares, outstanding (in shares)		71,097,000	64,726,000	64,380,000	64,105,000
Common Stock | SL Green Operating Partnership
Class of Stock [Line Items]
Shares, issued (in shares)		71,096,743
Shares, outstanding (in shares)		71,096,743