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Stockholders' Equity of the Company - 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
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Authorized capital stock (shares) | 260,000,000 |  | 260,000,000 |  |
Authorized shares, par value (in dollars per share) | $ 0.01 |  | $ 0.01 |  |
Common stock, shares authorized (in shares) | 160,000,000 |  | 160,000,000 |  | 160,000,000
Common stock, par value (in dollars per share) | $ 0.01 |  | $ 0.01 |  | $ 0.01
Excess stock, shares authorized (shares) | 75,000,000 |  | 75,000,000 |  |
Excess stock, par value (in dollars per share) | $ 0.01 |  | $ 0.01 |  |
Preferred stock, shares authorized (shares) | 25,000,000 |  | 25,000,000 |  |
Preferred stock, par value (in dollars per share) | $ 0.01 |  | $ 0.01 |  |
Excess shares issued (shares) | 0 |  | 0 |  |
Excess shares outstanding (in shares) | 0 |  | 0 |  |
Share repurchased (in shares) |  |  | 0 |  |
Common stock shares excluded from the diluted shares outstanding (shares) | 352,917 | 1,574,571 | 352,917 | 135,000 |
Series I Preferred Stock |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ 0.01 |  | $ 0.01 |  | $ 0.01
Preferred stock, dividends (in dollars per share) |  |  | $ 1.625 |  |
Share Repurchase Program |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Share repurchased (in shares) |  |  | 36,107,719 |  |
SL Green Operating Partnership |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Shares, outstanding (in shares) | 71,024,627 |  | 71,024,627 |  |
Shares, issued (in shares) | 71,024,627 |  | 71,024,627 |  |
Common stock shares excluded from the diluted shares outstanding (shares) | 352,917 | 1,574,571 | 352,917 | 135,000 |
SL Green Operating Partnership | Series I Preferred Stock |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Shares, outstanding (in shares) | 9,200,000 |  | 9,200,000 |  |

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