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Stockholders' Equity of the Company - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Nov. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Class of Stock [Line Items] |  |  |  |  |
Authorized capital stock (in 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 | $ 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 (in dollars per share) |  | $ 0.01 |  |  |
Excess shares issued (shares) |  | 0 |  |  |
Excess shares outstanding (in shares) |  | 0 |  |  |
Number of shares issued (in shares) | 5,063,291 |  |  |  |
Share price (in dollars per share) | $ 79.00 |  |  |  |
Proceeds from issuance of common stock | $ 386,300 | $ 386,790 | $ 0 | $ 0 |
Limited partner interests in Operating Partnership, limited partner common units outstanding (shares) | 5,063,291 |  |  |  |
SL Green Operating Partnership |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Limited partner interests in Operating Partnership, limited partner common units outstanding (shares) |  | 4,510,000 | 3,949,000 |  |
Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares, outstanding (in shares) |  | 71,097,000 | 64,726,000 | 64,380,000 | 64,105,000
Common Stock | SL Green Operating Partnership |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares, issued (in shares) |  | 71,096,743 |  |  |
Shares, outstanding (in shares) |  | 71,096,743 |  |  |

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