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General - Basis of Presentation (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 04, 2021
USD ($)
item
Jun. 30, 2020
USD ($)
Jul. 04, 2021
USD ($)
item
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Apr. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Summary of Significant Accounting Policies              
Number of parks owned or operated | item 27   27        
Number of reporting units | item     1        
Transformation Initiative              
Allowance for doubtful accounts $ 29,800 $ 6,400 $ 29,800 $ 6,400 $ 3,100    
Valuation allowance 129,400 134,100 129,400 134,100 128,200    
Accrued interest and penalties, income taxes 0 0 0 0 $ 0    
Other expense. net              
Transformation Initiative              
Consultant costs 67   6,854        
Technology modernization costs 976   3,070        
Employee termination costs 293   1,108        
Total transformation costs $ 1,336 $ 6,200 $ 11,032 $ 6,200      
Second Amended and Restated Term Loan B              
COVID 19 Considerations              
Incremental borrowing capacity           $ 131,000  
Maximum borrowing capacity           481,000 $ 350,000
Interest rate, stated percentage 3.00%   3.00%        
Senior Unsecured 2025 Notes | Six Flags Theme Parks Inc.              
COVID 19 Considerations              
Debt instrument, face amount           $ 725,000  
Interest rate, stated percentage           7.00%  
United States              
Summary of Significant Accounting Policies              
Number of parks owned or operated | item 24   24        
Mexico              
Summary of Significant Accounting Policies              
Number of parks owned or operated | item 2   2        
Canada              
Summary of Significant Accounting Policies              
Number of parks owned or operated | item 1   1