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Stockholders' Equity of the Company - Additional Information (Details) - $ / shares | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
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Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Authorized capital stock (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 |  |  |
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 value (in dollars per share) | $ 0.01 |  |  |  |  |
Excess shares issued (shares) | 0 |  |  |  |  |
Excess shares outstanding (in shares) | 0 |  |  |  |  |
Common Stock |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Shares, outstanding (in shares) | 65,235,000 | 64,814,000 | 64,726,000 | 64,398,000 | 64,387,000 | 64,380,000
SL Green Operating Partnership | Common Stock |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Shares, outstanding (in shares) | 65,235,013 |  |  |  |  |
Shares, issued (in shares) | 65,235,013 |  |  |  |  |

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