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Stockholders' Equity of the Company - Additional Information (Details) - $ / shares | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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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 |  |
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 |  |  |
Common Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares, outstanding (in shares) | 79,202,000 | 83,684,000 | 92,803,000 | 100,562,000
Common Stock | SL Green Operating Partnership |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares, outstanding (in shares) | 79,202,322 |  |  |

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