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Partners' Capital of the Operating Partnership - 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
Stockholders' Equity |  |  |  |  |
Common stock shares excluded from the diluted shares outstanding (shares) | 352,917 | 1,574,571 | 352,917 | 135,000 |
SL Green Operating Partnership |  |  |  |  |
Stockholders' Equity |  |  |  |  |
Shares, issued (in shares) | 71,024,627 |  | 71,024,627 |  |
Units outstanding (units) | 71,024,627 |  | 71,024,627 |  |
Number of units of operating partnership owned by the noncontrolling interest unit holders (units) | 4,852,552 |  | 4,852,552 |  | 4,509,953
Common stock shares excluded from the diluted shares outstanding (shares) | 352,917 | 1,574,571 | 352,917 | 135,000 |
SL Green Operating Partnership | Operating Partnership |  |  |  |  |
Stockholders' Equity |  |  |  |  |
Noncontrolling interest in the operating partnership (as a percent) | 6.40% |  | 6.40% |  | 5.97%
SL Green Operating Partnership | Series I Preferred Units |  |  |  |  |
Stockholders' Equity |  |  |  |  |
Units outstanding (units) | 9,200,000 |  | 9,200,000 |  |
Period of restriction to redeem OP Units |  |  | 1 year |  |
Conversion of stock, shares issued |  |  | 1 |  |

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