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Organization and Basis of Presentation - Additional Information (Details)
3 Months Ended
Jan. 15, 2021
$ / shares
Jan. 08, 2021
Mar. 31, 2021
Jan. 07, 2021
$ / shares
Dec. 31, 2020
Common Stock          
Organization          
Share price (in dollars per share)       $ 58.15  
Reverse stock split conversion ratio   1.02918      
Common Stock | Cash Dividend          
Organization          
Common stock, dividends, per share, cash paid (in dollars per share) $ 0.3735        
Common stock, dividends, per share, stock paid (in dollars per share) 0.0279        
Common Stock | Stock Dividend          
Organization          
Common stock, dividends, per share, stock paid (in dollars per share) $ 0.0343        
Service Corporation          
Organization          
Percentage of ownership in SL Green Management LLC owned by operating partnership (percent)     95.00%    
Operating Partnership | SL Green Operating Partnership          
Organization          
Noncontrolling interest in the operating partnership (as a percent)     5.65%   5.44%
SL Green Management | SL Green Management LLC          
Organization          
Percentage of ownership in SL Green Management LLC owned by operating partnership (percent)     100.00%