Noncontrolling Interests on the Company's Consolidated Financial Statements - Preferred Unit Activity (Details) - SL Green Operating Partnership - Preferred stock - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Rollforward Analysis of Preferred Unit Activity
Balance at beginning of period	$ 168,560	$ 164,210
Issuance of preferred units	5,800	4,320
Redemption of preferred units	0	0
Dividends paid on preferred units	(1,922)	(6,200)
Accrued dividends on preferred units	1,944	6,230
Balance at end of period	$ 174,382	$ 168,560