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Noncontrolling Interests on the Company's Consolidated Financial Statements - Additional Information (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
shares
$ / shares
Mar. 31, 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 (loss) income | $ $ (476) 6,202  
Accumulated other comprehensive income (loss) allocation | $ 2,655 (2,886)  
Partnership Interest      
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership      
Balance at beginning of period | $ 358,262 409,862 $ 409,862
Distributions | $ (4,148)   (12,652)
Issuance of common units | $ 4,483   12,018
Redemption and conversion of common units | $ (13,261)   (36,085)
Net (loss) income | $ (476)   20,016
Accumulated other comprehensive income (loss) allocation | $ 2,655   (2,299)
Fair value adjustment | $ 26,609   (32,598)
Balance at end of period | $ $ 374,124   $ 358,262
SL Green Operating Partnership      
Organization      
Number of units of operating partnership owned by the noncontrolling interest unit holders (shares) 4,156,282   3,938,823
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) 4,156,282    
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 income (loss) allocation | $ $ 2,655 $ (2,886)  
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    
Number of preferred units issued (in shares) 109,161    
Number of Units Outstanding (in shares) 109,161    
Annual dividends on preferred units (in dollars per share) | $ / shares $ 35.0000    
Liquidation preference of preferred units (in dollars per share) | $ / shares 1,000.00    
Operating partnership common stock value use for conversion of preferred units (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      
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    
Number of preferred units issued (in shares) 60    
Number of Units 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 1,000.00    
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares $ 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    
Number of preferred units issued (in shares) 1,902,000    
Number of Units Outstanding (in shares) 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    
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares $ 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    
Number of preferred units issued (in shares) 563,954    
Number of Units 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    
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares $ 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    
Number of preferred units issued (in shares) 378,634    
Number of Units 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    
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares $ 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    
Number of preferred units issued (in shares) 1,600,000    
Number of Units Outstanding (in shares) 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    
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares $ 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    
Number of preferred units issued (in shares) 200,000    
Number of Units Outstanding (in shares) 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    
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares $ 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    
Number of preferred units issued (in shares) 268,000    
Number of Units Outstanding (in shares) 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    
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares $ 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    
Number of preferred units issued (in shares) 400,000    
Number of Units 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    
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares $ 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    
Number of preferred units issued (in shares) 1,077,280    
Number of Units 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    
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares $ 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    
Number of preferred units issued (in shares) 40,000    
Number of Units Outstanding (in shares) 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    
Operating partnership common stock value use for conversion of preferred units (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    
Number of Units Outstanding (in shares) 1    
Preferred stock, dividend, multiplier per common unit distribution 1,350    
Operating Partnership | SL Green Operating Partnership      
Organization      
Noncontrolling interest in the operating partnership (as a percent) 5.65%   5.44%