Noncontrolling Interests on the Company's Consolidated Financial Statements - Preferred Unit Activity (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | 12 Months Ended | |
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2026 |
Sep. 30, 2025 |
Dec. 31, 2025 |
|
| Rollforward Analysis of Preferred Unit Activity | ||||
| Issuance of preferred units | $ 69 | $ 3,156 | $ 4,686 | |
| Redemption of preferred units | (15,631) | |||
| SL Green Operating Partnership | ||||
| Rollforward Analysis of Preferred Unit Activity | ||||
| Issuance of preferred units | 69 | 3,156 | 4,686 | |
| SL Green Operating Partnership | Preferred stock | ||||
| Rollforward Analysis of Preferred Unit Activity | ||||
| Balance at beginning of period | 168,560 | $ 164,210 | $ 164,210 | |
| Issuance of preferred units | 5,800 | 4,320 | ||
| Redemption of preferred units | 0 | 0 | ||
| Dividends paid on preferred units | (5,780) | (6,200) | ||
| Accrued dividends on preferred units | 5,844 | 6,230 | ||
| Balance at end of period | $ 174,424 | $ 174,424 | $ 168,560 | |