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General - Basis of Presentation - Additional Information (Details)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 06, 2020
item
Jun. 30, 2020
USD ($)
item
shares
Jun. 30, 2019
shares
Jun. 30, 2020
USD ($)
item
payment
shares
Jun. 30, 2019
shares
Apr. 30, 2020
USD ($)
Apr. 22, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Apr. 17, 2019
USD ($)
Summary of Significant Accounting Policies                    
Number of parks owned or operated | item   26   26            
Valuation allowance   $ 134.1   $ 134.1         $ 130.6  
Accrued interest and penalties, income taxes   $ 0.0   $ 0.0         0.0  
Number of reporting units | item       1            
Antidilutive stock options excluded from computation of diluted shares outstanding (in shares) | shares   5,995,000 2,989,000 5,995,000 2,872,000          
Number of contracts in a typical international agreement | item   1   1            
Number of upfront payments | payment       1            
Number of distinct promises within a typical international agreement | item   3   3            
Initial membership term       12 months            
Allowance for doubtful accounts   $ 6.4   $ 6.4         $ 8.3  
COVID 19 Considerations                    
Percentage of base salaries reduced for executive officers and full-time salaried employees 25.00%                  
Percentage of weekly hours reduced for full-time hourly workers 25.00%                  
Number of weekly hours full-time hourly workers were reduced to | item 30                  
Amount of deferral of increased investments planned       $ 20.0            
Percentage of full time employees salary restored before reopening parks 100.00%                  
Period prior to reopening of parks in which full salary is restored for full time employees 14 days                  
Second Amended and Restated Term Loan B                    
COVID 19 Considerations                    
Incremental borrowing capacity           $ 131.0        
Maximum borrowing capacity           481.0   $ 350.0   $ 800.0
Interest rate, stated percentage   3.01%   3.01%            
Senior Unsecured 2025 Notes                    
COVID 19 Considerations                    
Debt instrument, face amount           $ 725.0        
Interest rate, stated percentage           7.00%        
Senior Unsecured 2025 Notes | Six Flags Theme Parks Inc.                    
COVID 19 Considerations                    
Debt instrument, face amount             $ 725.0      
Interest rate, stated percentage             7.00%      
Minimum                    
COVID 19 Considerations                    
Amount of non-labor costs reduced in current year       $ 30.0            
Amount of deferral or elimination of discretional capital projects planned for current year       50.0            
Maximum                    
COVID 19 Considerations                    
Amount of non-labor costs reduced in current year       40.0            
Amount of deferral or elimination of discretional capital projects planned for current year       $ 60.0            
United States                    
Summary of Significant Accounting Policies                    
Number of parks owned or operated | item   23   23            
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