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Stockholders' Equity of the Company - Additional Information (Details)
3 Months Ended
Jan. 18, 2022
$ / shares
shares
Jan. 10, 2022
Jan. 07, 2022
$ / shares
Dec. 02, 2021
$ / shares
Jun. 30, 2022
$ / shares
shares
Mar. 31, 2022
$ / shares
shares
Jun. 30, 2021
$ / shares
shares
Mar. 31, 2021
$ / shares
shares
Dec. 31, 2021
$ / shares
shares
Dec. 31, 2020
shares
Equity, Class of Treasury Stock [Line Items]                    
Authorized capital stock (shares) | shares         260,000,000          
Authorized shares, par value (in dollars per share)         $ 0.01          
Common stock, shares authorized (in shares) | shares         160,000,000       160,000,000  
Common stock, par value (in dollars per share)         $ 0.01       $ 0.01  
Excess stock, shares authorized (shares) | shares         75,000,000          
Excess stock, par value (in dollars per share)         $ 0.01          
Preferred stock, shares authorized (shares) | shares         25,000,000          
Preferred stock, par value (in dollars per share)         $ 0.01          
Excess shares issued (shares) | shares         0          
Cash distribution declared, per common share (in dollars per share)         $ 0.932 $ 0.932 $ 0.910 $ 0.910    
Volume weighted average share price (in dollars per share)     $ 79.71              
Shareholder Election, Cash Option Subject to Proration                    
Equity, Class of Treasury Stock [Line Items]                    
Common stock, dividends, per share, cash paid (in dollars per share) $ 0.3976                  
Common stock, dividends, per share, stock issued (in shares) | shares 0.0295                  
Shareholder Election, Stock Option                    
Equity, Class of Treasury Stock [Line Items]                    
Common stock, dividends, per share, stock issued (in shares) | shares 0.0345                  
Ordinary Dividend                    
Equity, Class of Treasury Stock [Line Items]                    
Cash distribution declared, per common share (in dollars per share)       $ 0.3108            
Special Dividend                    
Equity, Class of Treasury Stock [Line Items]                    
Cash distribution declared, per common share (in dollars per share)       $ 2.4392            
Common Stock                    
Equity, Class of Treasury Stock [Line Items]                    
Shares, outstanding (in shares) | shares         64,302,000 64,124,000 65,866,000 67,296,000 64,105,000 66,474,000
Reverse stock split conversion ratio   1.03060                
SL Green Operating Partnership                    
Equity, Class of Treasury Stock [Line Items]                    
Cash distribution declared, per common share (in dollars per share)         $ 0.932 $ 0.932 $ 0.910 $ 0.910    
SL Green Operating Partnership | Common Stock                    
Equity, Class of Treasury Stock [Line Items]                    
Shares, outstanding (in shares) | shares         64,301,588