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UNAUDITED CONSOLIDATED STATEMENTS OF EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Shares of Common Stock Outstanding
Additional Paid-in-Capital
Retained Deficit
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Ending balance (in shares)   100,350      
Ending balance $ 2,041,863 $ 1,004 $ 2,207,410 $ (164,271) $ (2,280)
Beginning balance (in shares) at Dec. 31, 2024   100,350      
Beginning balance at Dec. 31, 2024 2,041,863 $ 1,004 2,207,410 (164,271) (2,280)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net loss attributable to Six Flags Entertainment Corporation (219,718)     (219,718)  
Equity-based compensation (in shares)   724      
Equity-based compensation 2,421 $ 6 2,415    
Foreign currency translation adjustment, net of tax 9,038       9,038
Defined benefit retirement plan, net of tax $ 176       176
Ending balance (in shares) 101,074 101,074      
Ending balance $ 1,833,780 $ 1,010 2,209,825 (383,989) 6,934
Ending balance (in shares) 101,696 101,696      
Ending balance $ 549,757 $ 1,017 2,245,553 (1,763,369) 66,556
Beginning balance (in shares) at Dec. 31, 2025 101,696 101,696      
Beginning balance at Dec. 31, 2025 $ 549,757 $ 1,017 2,245,553 (1,763,369) 66,556
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net loss attributable to Six Flags Entertainment Corporation (268,600)     (268,600)  
Equity-based compensation (in shares)   292      
Equity-based compensation (263)   (263)    
Foreign currency translation adjustment, net of tax $ (1,668)       (1,668)
Ending balance (in shares) 101,988 101,988      
Ending balance $ 279,226 $ 1,017 $ 2,245,290 $ (2,031,969) $ 64,888