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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, 2022
USD ($)
shares
$ / shares
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
shares
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership      
Net income | $ $ 492 $ (476)  
Accumulated other comprehensive loss allocation | $ $ 2,277 2,655  
SL Green Operating Partnership      
Organization      
Number of units of operating partnership owned by the noncontrolling interest unit holders (shares) 4,095,291   3,781,565
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) 4,095,291    
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership      
Accumulated other comprehensive loss allocation | $ $ 2,277 2,655  
SL Green Operating Partnership | 3.50% Series A      
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership      
Stated Distribution Rate 3.50%    
Number of Units Authorized (in shares) 109,161    
Number of Units Issued (in shares) 109,161    
Number of Units Outstanding (in shares) 109,161    
Annual Dividend Per Unit (in dollars per share) | $ / shares $ 35.0000    
Liquidation Preference Per Unit (in dollars per share) | $ / shares 1,000    
Conversion Price Per Unit (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      
Stated Distribution Rate 700.00%    
Number of Units Authorized (in shares) 60    
Number of Units Issued (in shares) 60    
Number of Units Outstanding (in shares) 60    
Annual Dividend Per Unit (in dollars per share) | $ / shares $ 70.0000    
Liquidation Preference Per Unit (in dollars per share) | $ / shares 1,000    
Conversion Price Per Unit (in dollars per share) | $ / shares $ 29.12    
SL Green Operating Partnership | Series K      
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership      
Stated Distribution Rate 350.00%    
Number of Units Authorized (in shares) 700,000    
Number of Units Issued (in shares) 563,954    
Number of Units Outstanding (in shares) 341,677    
Annual Dividend Per Unit (in dollars per share) | $ / shares $ 0.8750    
Liquidation Preference Per Unit (in dollars per share) | $ / shares 25.00    
Conversion Price Per Unit (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      
Stated Distribution Rate 400.00%    
Number of Units Authorized (in shares) 500,000    
Number of Units Issued (in shares) 378,634    
Number of Units Outstanding (in shares) 372,634    
Annual Dividend Per Unit (in dollars per share) | $ / shares $ 1.0000    
Liquidation Preference Per Unit (in dollars per share) | $ / shares 25.00    
Conversion Price Per Unit (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      
Stated Distribution Rate 400.00%    
Number of Units Authorized (in shares) 200,000    
Number of Units Issued (in shares) 200,000    
Number of Units Outstanding (in shares) 200,000    
Annual Dividend Per Unit (in dollars per share) | $ / shares $ 1.0000    
Liquidation Preference Per Unit (in dollars per share) | $ / shares 25.00    
Conversion Price Per Unit (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      
Stated Distribution Rate 350.00%    
Number of Units Authorized (in shares) 268,000    
Number of Units Issued (in shares) 268,000    
Number of Units Outstanding (in shares) 268,000    
Annual Dividend Per Unit (in dollars per share) | $ / shares $ 0.8750    
Liquidation Preference Per Unit (in dollars per share) | $ / shares 25.00    
Conversion Price Per Unit (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      
Stated Distribution Rate 350.00%    
Number of Units Authorized (in shares) 400,000    
Number of Units Issued (in shares) 400,000    
Number of Units Outstanding (in shares) 400,000    
Annual Dividend Per Unit (in dollars per share) | $ / shares $ 0.8750    
Liquidation Preference Per Unit (in dollars per share) | $ / shares 25.00    
Conversion Price Per Unit (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      
Stated Distribution Rate 400.00%    
Number of Units Authorized (in shares) 1,077,280    
Number of Units Issued (in shares) 1,077,280    
Number of Units Outstanding (in shares) 1,077,280    
Annual Dividend Per Unit (in dollars per share) | $ / shares $ 1.0000    
Liquidation Preference Per Unit (in dollars per share) | $ / shares 25.00    
Conversion Price Per Unit (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      
Stated Distribution Rate 350.00%    
Number of Units Authorized (in shares) 40,000    
Number of Units Issued (in shares) 40,000    
Number of Units Outstanding (in shares) 40,000    
Annual Dividend Per Unit (in dollars per share) | $ / shares $ 0.8750    
Liquidation Preference Per Unit (in dollars per share) | $ / shares 25.00    
Conversion Price Per Unit (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      
Number of Units Authorized (in shares) 1    
Number of Units Issued (in shares) 1    
Number of Units Outstanding (in shares) 1    
Preferred stock, dividend, multiplier per common unit distribution 1,350    
Partnership Interest      
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership      
Balance at beginning of period | $ $ 344,252 $ 358,262 $ 358,262
Distributions | $ (4,415)   (15,749)
Issuance of common units | $ 6,721   18,678
Redemption and conversion of common units | $ (18,272)   (53,289)
Net income | $ 492   25,457
Accumulated other comprehensive loss allocation | $ 2,277   1,042
Fair value adjustment | $ 43,023   9,851
Balance at end of period | $ $ 374,078   $ 344,252
Operating Partnership | SL Green Operating Partnership      
Organization      
Noncontrolling interest in the operating partnership (as a percent) 6.00%   5.57%