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Significant Accounting Policies (Reclassification 2)(Details) - USD ($)
shares in Thousands, $ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Limited partner interests in SLGOP $ 431,852 $ 521,842    
SL Green Operating Partnership        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Limited partner interests in SLGOP   469,524    
SL Green partner's capital 7,074,282 6,722,422    
Partners' Capital $ 7,719,317 7,459,216 $ 7,016,876 $ 6,907,103
SL Green Operating Partnership | As Previously Reported        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Limited partner interests in SLGOP   0    
SL Green partner's capital   $ 7,078,924    
Common Stock | Partners' Interest | SL Green Operating Partnership        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Partners' Capital Account, Units 99,976 97,325 94,993 91,250
Partners' Capital $ 7,074,282 $ 6,722,422 $ 6,318,684 $ 6,047,084
Common Stock | Partners' Interest | SL Green Operating Partnership | As Previously Reported        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Partners' Capital Account, Units   97,325 94,993 91,250
Partners' Capital   $ 7,078,924 $ 6,506,747 $ 6,189,529
Common Stock | Partners' Interest | SL Green Operating Partnership | Adjustment        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Partners' Capital Account, Units   0 0 0
Partners' Capital   $ (356,502) $ (188,063) $ (142,445)
Common Stock | Limited Partners | SL Green Operating Partnership        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Limited partner interests in SLGOP   0    
Common Stock | Limited Partners | SL Green Operating Partnership | As Previously Reported        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Limited partner interests in SLGOP   $ 113,298