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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. 23, 2020
Sep. 25, 2019
Sep. 23, 2020
Sep. 25, 2019
Numerator:        
Net income (loss) $ (6,110) $ 11,423 $ (25,220) $ 26,201
Less: net income (loss) attributable to non-controlling interests (551) 1,079 (2,490) 4,281
NET INCOME (LOSS) ATTRIBUTABLE TO SHAKE SHACK INC. $ (5,559) $ 10,344 $ (22,730) $ 21,920
Denominator:        
Weighted-average shares of Class A common stock outstanding—basic (in shares) 38,251 31,961 36,668 30,549
Effect of dilutive securities:        
Weighted-average shares of Class A common stock outstanding—diluted (in shares) 38,251 32,916 36,668 31,441
Earnings per share of Class A common stock—basic (in dollars per share) $ (0.15) $ 0.32 $ (0.62) $ 0.72
Earnings per share of Class A common stock—diluted (in dollars per share) $ (0.15) $ 0.31 $ (0.62) $ 0.70
Performance stock units        
Effect of dilutive securities:        
Stock options (in shares) 0 50 0 64
Restricted stock units        
Effect of dilutive securities:        
Stock options (in shares) 0 81 0 51
Stock options        
Effect of dilutive securities:        
Stock options (in shares) 0 824 0 777