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Earnings per Share - Schedule of Share Amounts Used in Calculating Basic and Diluted Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 29, 2026
Mar. 30, 2025
Earnings Per Share [Abstract]    
Net loss attributable to Six Flags Entertainment Corporation $ (268,600) $ (219,718)
Basic weighted average shares of common stock (in shares) 101,485 100,094
Diluted weighted average shares of common stock (in shares) 101,485 100,094
Basic (in dollars per share) $ (2.65) $ (2.20)
Diluted (in dollars per share) $ (2.65) $ (2.20)