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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
Mar. 31, 2022
$ / 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 $ 0.938    
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         64,124,000 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 $ 0.938    
SL Green Operating Partnership | Common Stock                
Equity, Class of Treasury Stock [Line Items]                
Shares, outstanding (in shares) | shares         64,124,447