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Noncontrolling Interests on the Company's Consolidated Financial Statements - Additional Information (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2023 USD ($) $ / shares shares | Dec. 31, 2022 USD ($) shares | Dec. 31, 2021 USD ($)
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership |  |  |
Distributions | $ | $ (2,777) | $ (4,699) | $ (6,631)
Acquisition of subsidiary interest from noncontrolling interest | $ |  | (29,817) |
Net loss | $ | (37,465) | (5,794) | 25,457
Accumulated other comprehensive income allocation | $ | $ (1,960) | 5,827 | 1,042
Series B Preferred Stock |  |  |
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership |  |  |
Preferred units, issued (in shares) | 0 |  |
SL Green Operating Partnership |  |  |
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership |  |  |
Balance at beginning of period | $ | $ 269,993 | 344,252 |
Distributions | $ | (14,779) | (16,272) |
Issuance of common units | $ | 25,365 | 22,855 |
Acquisition of subsidiary interest from noncontrolling interest | $ | (18,589) | (40,901) |
Net loss | $ | (37,465) | (5,794) |
Accumulated other comprehensive income allocation | $ | (1,960) | 5,827 |
Fair value adjustment | $ | 15,486 | (39,974) |
Balance at end of period | $ | $ 238,051 | $ 269,993 | 344,252
SL Green Operating Partnership |  |  |
Organization |  |  |
Number of units of operating partnership owned by the noncontrolling interest unit holders (shares) | 3,949,448 | 3,670,343 |
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership |  |  |
Distributions | $ | $ (2,777) | $ (4,699) | (6,631)
Acquisition of subsidiary interest from noncontrolling interest | $ |  | (29,817) |
Accumulated other comprehensive income allocation | $ | $ (1,960) | $ 5,827 | $ 1,042
SL Green Operating Partnership | Operating Partnership |  |  |
Organization |  |  |
Noncontrolling interest in the operating partnership (as a percent) | 5.75% | 5.39% |
SL Green Operating Partnership | Series A Preferred Units |  |  |
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership |  |  |
Stated Distribution Rate | 5.00% |  |
Preferred Units, shares authorized (in shares) | 109,161 |  |
Number of preferred units issued (in shares) | 109,161 |  |
Preferred units, shares outstanding (in shares) | 109,161 |  |
Annual dividends on preferred units (in dollars per share) | $ / shares | $ 50.0000 |  |
Liquidation preference of preferred units (in dollars per share) | $ / shares | 1,000 |  |
Conversion Price Per Unit (in dollars per share) | $ / shares | $ 0 |  |
Number of company common stock issued on conversion of Series B preferred units | 6.71348 |  |
SL Green Operating Partnership | Series F Preferred Units |  |  |
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership |  |  |
Stated Distribution Rate | 7.00% |  |
Preferred Units, shares authorized (in shares) | 60 |  |
Number of preferred units issued (in shares) | 60 |  |
Preferred units, shares outstanding (in shares) | 60 |  |
Annual dividends on preferred units (in dollars per share) | $ / shares | $ 70.0000 |  |
Liquidation preference of preferred units (in dollars per share) | $ / shares | 1,000 |  |
Conversion Price Per Unit (in dollars per share) | $ / shares | $ 29.12 |  |
SL Green Operating Partnership | Series K Preferred Units |  |  |
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership |  |  |
Stated Distribution Rate | 3.50% |  |
Preferred Units, shares authorized (in shares) | 700,000 |  |
Number of preferred units issued (in shares) | 563,954 |  |
Preferred units, shares outstanding (in shares) | 341,677 |  |
Annual dividends on preferred units (in dollars per share) | $ / shares | $ 0.8750 |  |
Liquidation preference of preferred units (in dollars per share) | $ / shares | 25.00 |  |
Conversion Price Per Unit (in dollars per share) | $ / shares | $ 134.67 |  |
SL Green Operating Partnership | Series L Preferred Units |  |  |
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership |  |  |
Stated Distribution Rate | 4.00% |  |
Preferred Units, shares authorized (in shares) | 500,000 |  |
Number of preferred units issued (in shares) | 378,634 |  |
Preferred units, shares outstanding (in shares) | 372,634 |  |
Annual dividends on preferred units (in dollars per share) | $ / shares | $ 1.0000 |  |
Liquidation preference of preferred units (in dollars per share) | $ / shares | 25.00 |  |
Conversion Price Per Unit (in dollars per share) | $ / shares | $ 0 |  |
SL Green Operating Partnership | Series R Preferred Units |  |  |
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership |  |  |
Stated Distribution Rate | 3.50% |  |
Preferred Units, shares authorized (in shares) | 400,000 |  |
Number of preferred units issued (in shares) | 400,000 |  |
Preferred units, shares outstanding (in shares) | 400,000 |  |
Annual dividends on preferred units (in dollars per share) | $ / shares | $ 0.8750 |  |
Liquidation preference of preferred units (in dollars per share) | $ / shares | 25.00 |  |
Conversion Price Per Unit (in dollars per share) | $ / shares | $ 154.89 |  |
SL Green Operating Partnership | Series S Preferred Units |  |  |
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership |  |  |
Stated Distribution Rate | 4.00% |  |
Preferred Units, shares authorized (in shares) | 1,077,280 |  |
Number of preferred units issued (in shares) | 1,077,280 |  |
Preferred units, shares outstanding (in shares) | 1,077,280 |  |
Annual dividends on preferred units (in dollars per share) | $ / shares | $ 1.0000 |  |
Liquidation preference of preferred units (in dollars per share) | $ / shares | 25.00 |  |
Conversion Price Per Unit (in dollars per share) | $ / shares | $ 0 |  |
SL Green Operating Partnership | Series V Preferred Stock |  |  |
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership |  |  |
Stated Distribution Rate | 5.00% |  |
Preferred Units, shares authorized (in shares) | 40,000 |  |
Number of preferred units issued (in shares) | 40,000 |  |
Preferred units, shares outstanding (in shares) | 40,000 |  |
Annual dividends on preferred units (in dollars per share) | $ / shares | $ 1.2500 |  |
Liquidation preference of preferred units (in dollars per share) | $ / shares | 25.00 |  |
Conversion Price Per Unit (in dollars per share) | $ / shares | $ 0 |  |
SL Green Operating Partnership | Series W |  |  |
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership |  |  |
Preferred Units, shares authorized (in shares) | 1 |  |
Number of preferred units issued (in shares) | 1 |  |
Preferred units, shares outstanding (in shares) | 1 |  |
Preferred stock, dividend, multiplier per common unit distribution | 1,350 |  |
SL Green Operating Partnership | Series B Preferred Stock |  |  |
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership |  |  |
Convertible preferred stock, shares issued upon conversion (in shares) | 1 |  |

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