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Noncontrolling Interests on the Company's Consolidated Financial Statements - Additional Information (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
shares
$ / shares
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
shares
$ / shares
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
shares
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership            
Redemption and conversion of common units | $     $ (1,536)      
Net income | $ $ 22,683 $ 802   $ 28,489 $ 10,073  
Accumulated other comprehensive loss allocation | $ $ 415 317   $ 229 (2,664)  
SL Green Operating Partnership            
Organization            
Number of units of operating partnership owned by the noncontrolling interest unit holders (shares) 3,888,034     3,888,034   3,938,823
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) 3,888,034     3,888,034    
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership            
Redemption and conversion of common units | $     (1,536)      
Accumulated other comprehensive loss allocation | $ $ 415 $ 317   $ 229 (2,664)  
SL Green Operating Partnership | 3.50% Series A            
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership            
Dividend rate preferred units (as a percent)       3.50%    
Preferred units, shares authorized (in shares) 109,161     109,161    
Number of preferred units issued (in shares) 109,161     109,161    
Number of Units Outstanding (in shares) 109,161     109,161    
Annual dividends on preferred units (in dollars per share) | $ / shares       $ 35.0000    
Liquidation preference of preferred units (in dollars per share) | $ / shares $ 1,000     1,000    
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares $ 0     $ 0    
Number of company common stock issued on conversion of Series B preferred units       6.71348    
SL Green Operating Partnership | Series F            
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership            
Dividend rate preferred units (as a percent)       700.00%    
Preferred units, shares authorized (in shares) 60     60    
Number of preferred units issued (in shares) 60     60    
Number of Units Outstanding (in shares) 60     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     1,000    
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares $ 29.12     $ 29.12    
SL Green Operating Partnership | 4.50% Series G            
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership            
Dividend rate preferred units (as a percent)       450.00%    
Preferred units, shares authorized (in shares) 1,902,000     1,902,000    
Number of preferred units issued (in shares) 1,902,000     1,902,000    
Number of Units Outstanding (in shares) 718,697     718,697    
Annual dividends on preferred units (in dollars per share) | $ / shares       $ 1.1250    
Liquidation preference of preferred units (in dollars per share) | $ / shares $ 25.00     25.00    
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares $ 88.50     $ 88.50    
Number of company common stock issue on redemption of operation partnership common units       1    
SL Green Operating Partnership | Series K            
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership            
Dividend rate preferred units (as a percent)       350.00%    
Preferred units, shares authorized (in shares) 700,000     700,000    
Number of preferred units issued (in shares) 563,954     563,954    
Number of Units Outstanding (in shares) 341,677     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     25.00    
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares $ 134.67     $ 134.67    
SL Green Operating Partnership | Series L            
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership            
Dividend rate preferred units (as a percent)       400.00%    
Preferred units, shares authorized (in shares) 500,000     500,000    
Number of preferred units issued (in shares) 378,634     378,634    
Number of Units Outstanding (in shares) 372,634     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     25.00    
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares $ 0     $ 0    
SL Green Operating Partnership | Series M            
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership            
Dividend rate preferred units (as a percent)       375.00%    
Preferred units, shares authorized (in shares) 1,600,000     1,600,000    
Number of preferred units issued (in shares) 1,600,000     1,600,000    
Number of Units Outstanding (in shares) 96,357     96,357    
Annual dividends on preferred units (in dollars per share) | $ / shares       $ 0.9375    
Liquidation preference of preferred units (in dollars per share) | $ / shares $ 25.00     25.00    
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares $ 0     $ 0    
SL Green Operating Partnership | Series P            
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership            
Dividend rate preferred units (as a percent)       400.00%    
Preferred units, shares authorized (in shares) 200,000     200,000    
Number of preferred units issued (in shares) 200,000     200,000    
Number of Units Outstanding (in shares) 200,000     200,000    
Annual dividends on preferred units (in dollars per share) | $ / shares       $ 1.0000    
Liquidation preference of preferred units (in dollars per share) | $ / shares $ 25.00     25.00    
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares $ 0     $ 0    
SL Green Operating Partnership | Series Q            
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership            
Dividend rate preferred units (as a percent)       350.00%    
Preferred units, shares authorized (in shares) 268,000     268,000    
Number of preferred units issued (in shares) 268,000     268,000    
Number of Units Outstanding (in shares) 268,000     268,000    
Annual dividends on preferred units (in dollars per share) | $ / shares       $ 0.8750    
Liquidation preference of preferred units (in dollars per share) | $ / shares $ 25.00     25.00    
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares $ 148.95     $ 148.95    
SL Green Operating Partnership | Series R            
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership            
Dividend rate preferred units (as a percent)       350.00%    
Preferred units, shares authorized (in shares) 400,000     400,000    
Number of preferred units issued (in shares) 400,000     400,000    
Number of Units Outstanding (in shares) 400,000     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     25.00    
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares $ 154.89     $ 154.89    
SL Green Operating Partnership | Series S            
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership            
Dividend rate preferred units (as a percent)       400.00%    
Preferred units, shares authorized (in shares) 1,077,280     1,077,280    
Number of preferred units issued (in shares) 1,077,280     1,077,280    
Number of Units Outstanding (in shares) 1,077,280     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     25.00    
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares $ 0     $ 0    
SL Green Operating Partnership | Series V            
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership            
Dividend rate preferred units (as a percent)       350.00%    
Preferred units, shares authorized (in shares) 40,000     40,000    
Number of preferred units issued (in shares) 40,000     40,000    
Number of Units Outstanding (in shares) 40,000     40,000    
Annual dividends on preferred units (in dollars per share) | $ / shares       $ 0.8750    
Liquidation preference of preferred units (in dollars per share) | $ / shares $ 25.00     25.00    
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares $ 0     $ 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     1    
Number of preferred units issued (in shares) 1     1    
Number of Units Outstanding (in shares) 1     1    
Preferred stock, dividend, multiplier per common unit distribution       1,350    
Partnership Interest            
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership            
Balance at beginning of period | $     $ 409,862 $ 358,262 $ 409,862 $ 409,862
Distributions | $       (11,882)   (12,652)
Issuance of common units | $       11,910   12,018
Redemption and conversion of common units | $       (41,516)   (36,085)
Net income | $       28,489   20,016
Accumulated other comprehensive loss allocation | $       229   (2,299)
Fair value adjustment | $       17,245   (32,598)
Balance at end of period | $ $ 362,737     $ 362,737   $ 358,262
Operating Partnership | SL Green Operating Partnership            
Organization            
Noncontrolling interest in the operating partnership (as a percent) 5.50%     5.50%   5.44%