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EARNINGS PER SHARE - Schedule of Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 27, 2017
Sep. 28, 2016
Sep. 27, 2017
Sep. 28, 2016
Numerator:        
Document period end date     Sep. 27, 2017  
Net income $ 7,870 $ 6,789 $ 19,916 $ 16,689
Less: net income attributable to non-controlling interests 2,873 3,023 7,773 8,163
NET INCOME ATTRIBUTABLE TO SHAKE SHACK INC. $ 4,997 $ 3,766 $ 12,143 $ 8,526
Denominator:        
Weighted-average shares of Class A common stock outstanding—basic (in shares) 26,024 24,023 25,733 22,310
Effect of dilutive securities:        
Weighted-average shares of Class A common stock outstanding—diluted (in shares) 26,477 24,554 26,248 22,805
Earnings (loss) per share of Class A common stock—basic (in dollars per share) $ 0.19 $ 0.16 $ 0.47 $ 0.38
Earnings (loss) per share of Class A common stock—diluted (in dollars per share) $ 0.19 $ 0.15 $ 0.46 $ 0.37
Performance stock units        
Effect of dilutive securities:        
Stock options (in shares) 26 0 24 0
Restricted Stock Units (RSUs) [Member]        
Effect of dilutive securities:        
Stock options (in shares) 16 0 5 0
Employee Stock Option        
Effect of dilutive securities:        
Stock options (in shares) 411 531 486 495