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Partners' Capital of the Operating Partnership - Additional Information (Details) - shares | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Series I Preferred Units |  |  |  |
Stockholders' Equity |  |  |  |
Preferred stock, shares outstanding (in shares) | 9,200,000 | 9,200,000 |  |
Common Stock |  |  |  |
Stockholders' Equity |  |  |  |
Units, outstanding (in units) | 71,097,000 | 64,726,000 | 64,380,000 | 64,105,000
SL Green Operating Partnership |  |  |  |
Stockholders' Equity |  |  |  |
Number of units of operating partnership owned by the noncontrolling interest unit holders (units) | 4,509,953 | 3,949,448 |  |
SL Green Operating Partnership | Operating Partnership |  |  |  |
Stockholders' Equity |  |  |  |
Noncontrolling interest in the operating partnership (as a percent) | 5.97% | 5.75% |  |
SL Green Operating Partnership | Series I Preferred Units |  |  |  |
Stockholders' Equity |  |  |  |
Common units redemption, period of restriction | 1 year |  |  |
Conversion of stock, shares issued (in shares) | 1 |  |  |
SL Green Operating Partnership | Common Stock |  |  |  |
Stockholders' Equity |  |  |  |
Units, outstanding (in units) | 71,096,743 |  |  |
Shares, issued (in shares) | 71,096,743 |  |  |

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