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Noncontrolling Interests on the Company's Consolidated Financial Statements (Details)
1 Months Ended 12 Months Ended
Jan. 31, 2012
$ / shares
shares
Dec. 31, 2016
USD ($)
shares
$ / shares
Dec. 31, 2015
USD ($)
unit
$ / shares
shares
Dec. 31, 2014
USD ($)
shares
Mar. 31, 2016
shares
Aug. 31, 2015
shares
Jul. 31, 2015
shares
Jun. 30, 2015
shares
Feb. 28, 2015
shares
Aug. 31, 2014
shares
Organization                    
Basic weighted average common shares outstanding (in shares) | shares   100,185,000 99,345,000 95,774,000            
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership                    
Balance at beginning of period | $   $ 424,206,000                
Distributions | $   (15,419,000) $ (119,784,000) $ (7,019,000)            
Redemption of common units | $     (20,650,000)              
Net income | $   10,136,000 10,565,000 18,467,000            
Accumulated other comprehensive income allocation | $   1,299,000 (67,000) $ 175,000            
Balance at end of period | $   $ 473,882,000 $ 424,206,000              
Number of company common stock issued on conversion of Series B preferred units   6.71348                
SL Green Operating Partnership                    
Organization                    
Basic weighted average common shares outstanding (in shares) | shares   104,508,000 103,244,000 99,288,000            
Noncontrolling interest in the operating partnership (as a percent)   4.16%                
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership                    
Balance at beginning of period | $   $ 424,206,000 $ 469,524,000              
Distributions | $   (12,671,000) (9,710,000)              
Issuance of common units | $   78,495,000 30,506,000              
Redemption of common units | $   (31,805,000) (55,697,000)              
Net income | $   10,136,000 10,565,000              
Accumulated other comprehensive income allocation | $   1,299,000 (67,000)              
Fair value adjustment | $   4,222,000 (20,915,000)              
Balance at end of period | $   $ 473,882,000 $ 424,206,000 $ 469,524,000            
Stock-based compensation plans (shares) | shares   373,000 490,000 408,000            
SL Green Operating Partnership | Series G Preferred Units                    
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership                    
Number of preferred units issued (in shares) | shares 1,902,000                  
Dividend rate preferred units (as a percent) 4.50%                  
Liquidation preference of preferred units (in dollars per share) | $ / shares $ 25.00                  
Annual dividends on preferred units (in dollars per share) | $ / shares   $ 1.125                
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 F Preferred Units                    
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership                    
Number of preferred units issued (in shares) | shares   60                
Mandatory liquidation preference (in dollars per share) | $   $ 1,000.00                
SL Green Operating Partnership | Series K Preferred Units                    
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership                    
Number of preferred units issued (in shares) | shares                   563,954
Dividend rate preferred units (as a percent)   3.50%                
Liquidation preference of preferred units (in dollars per share) | $ / shares   $ 25.00                
Annual dividends on preferred units (in dollars per share) | $ / shares   0.875                
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares   $ 134.67                
Preferred Units, shares authorized | shares   700,000                
SL Green Operating Partnership | Series L Preferred Units                    
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership                    
Number of preferred units issued (in shares) | shares                   378,634
Dividend rate preferred units (as a percent)   4.00%                
Liquidation preference of preferred units (in dollars per share) | $ / shares   $ 25.00                
Annual dividends on preferred units (in dollars per share) | $ / shares   $ 1.00                
Preferred Units, shares authorized | shares   500,000                
SL Green Operating Partnership | Series M Preferred Units                    
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership                    
Number of preferred units issued (in shares) | shares                 1,600,000  
Dividend rate preferred units (as a percent)   3.75%                
Liquidation preference of preferred units (in dollars per share) | $ / shares   $ 25.00                
Annual dividends on preferred units (in dollars per share) | $ / shares   $ 0.9375                
Preferred Units, shares authorized | shares   1,600,000                
SL Green Operating Partnership | Series N Preferred Units                    
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership                    
Number of preferred units issued (in shares) | shares               552,303    
Dividend rate preferred units (as a percent)   3.00%                
Liquidation preference of preferred units (in dollars per share) | $ / shares   $ 25.00                
Annual dividends on preferred units (in dollars per share) | $ / shares   $ 0.75                
Preferred Units, shares authorized | shares   552,303                
SL Green Operating Partnership | Series O Preferred Units                    
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership                    
Dividend rate preferred units (as a percent)   6.25%                
Preferred Units, shares authorized | shares   1                
SL Green Operating Partnership | Series P Preferred Units                    
Organization                    
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) | shares   200,000                
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership                    
Number of preferred units issued (in shares) | shares             200,000      
Dividend rate preferred units (as a percent)   4.00%                
Liquidation preference of preferred units (in dollars per share) | $ / shares   $ 25.00                
Annual dividends on preferred units (in dollars per share) | $ / shares   $ 1.00                
SL Green Operating Partnership | Series Q Preferred Units                    
Organization                    
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) | shares   268,000                
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership                    
Number of preferred units issued (in shares) | shares             268,000      
Dividend rate preferred units (as a percent)   3.50%                
Liquidation preference of preferred units (in dollars per share) | $ / shares   $ 25.00                
Annual dividends on preferred units (in dollars per share) | $ / shares   0.875                
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares   $ 148.95                
SL Green Operating Partnership | Series R Preferred Units                    
Organization                    
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) | shares   400,000                
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership                    
Number of preferred units issued (in shares) | shares           400,000        
Dividend rate preferred units (as a percent)   3.50%                
Liquidation preference of preferred units (in dollars per share) | $ / shares   $ 25.00                
Annual dividends on preferred units (in dollars per share) | $ / shares   0.875                
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares   $ 154.89                
SL Green Operating Partnership | Series S Preferred Units                    
Organization                    
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) | shares   1,077,280                
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership                    
Number of preferred units issued (in shares) | shares           1,077,280        
Dividend rate preferred units (as a percent)   4.00%                
Liquidation preference of preferred units (in dollars per share) | $ / shares   $ 25.00                
Annual dividends on preferred units (in dollars per share) | $ / shares   $ 1.00                
SL Green Operating Partnership | Series T Preferred Stock [Member] [Member]                    
Organization                    
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) | shares   230,000                
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership                    
Number of preferred units issued (in shares) | shares         230,000          
Dividend rate preferred units (as a percent)   2.75%                
Liquidation preference of preferred units (in dollars per share) | $ / shares   $ 25.00                
Annual dividends on preferred units (in dollars per share) | $ / shares   0.6875                
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares   $ 119.02                
SL Green Operating Partnership | Series U Preferred Stock [Member]                    
Organization                    
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) | shares   680,000                
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership                    
Number of preferred units issued (in shares) | shares         680,000          
Dividend rate preferred units (as a percent)   4.50%                
Liquidation preference of preferred units (in dollars per share) | $ / shares   $ 25.00                
Annual dividends on preferred units (in dollars per share) | $ / shares   $ 1.125                
SL Green Operating Partnership | Series A Preferred Units                    
Organization                    
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) | shares   109,161                
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership                    
Number of preferred units issued (in shares) | shares           109,161        
Dividend rate preferred units (as a percent)   3.50%                
Liquidation preference of preferred units (in dollars per share) | $ / shares   $ 1,000.00                
Annual dividends on preferred units (in dollars per share) | $ / shares   $ 35.00                
SL Green Operating Partnership | Series B Preferred Units                    
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership                    
Number of preferred units issued (in shares) | shares   0                
SL Green Operating Partnership                    
Organization                    
Noncontrolling interest in the operating partnership (as a percent)     3.61%              
Number of units of operating partnership owned by the noncontrolling interest unit holders (shares)   4,363,716 3,745,766              
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) | shares   4,363,716.000                
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership                    
Distributions | $   $ (15,419,000) $ (119,784,000) $ (7,019,000)            
Redemption of common units | $     (20,650,000)              
Accumulated other comprehensive income allocation | $   $ 1,299,000 $ (67,000) $ 175,000            
Number of preferred units issued (in shares) | shares   9,200,000 9,200,000              
Liquidation preference of preferred units (in dollars per share) | $ / shares   $ 25.00 $ 25.00              
Minimum | SL Green Operating Partnership | Series U Preferred Stock [Member]                    
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership                    
Annual dividends on preferred units (in dollars per share) | $ / shares   $ 0.75