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Commitments and Contingencies (Details)				1 Months Ended					12 Months Ended
Commitments and Contingencies (Details)	Apr. 08, 2020 claim	Jan. 07, 2016 USD ($)	Apr. 01, 1998 USD ($)	May 31, 2020 USD ($) shares	Apr. 30, 2020 lawsuit	Mar. 31, 2020 claim	Feb. 29, 2020 claim	May 31, 2019 USD ($) shares	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) multiple	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 lawsuit	Apr. 07, 2017 item
Details of commitments and contingencies
Acquisition of capital stock of the former Six Flags Entertainment Corporation, paid in cash			$ 976,000,000.0
Redemption value of noncontrolling interests										$ 523,400,000
Additions to property and equipment										100,878,000	$ 143,913,000	$ 135,624,000
Total loans receivable from the partnerships that own partnership parks										288,300,000	$ 239,300,000
Pending Litigation
Details of commitments and contingencies
Number of claims filed \| claim						3
Privacy Class Action Lawsuits
Details of commitments and contingencies
Number of questions certified for consideration by appellate court \| item														2
Privacy Class Action Lawsuits \| Pending Litigation
Details of commitments and contingencies
Number of claims filed \| lawsuit													4
Privacy Class Action Lawsuits \| Pending Litigation \| Minimum
Details of commitments and contingencies
Range of possible loss per aggrieved party										100
Privacy Class Action Lawsuits \| Pending Litigation \| Maximum
Details of commitments and contingencies
Range of possible loss per aggrieved party										1,000
Securities Class Action Lawsuits \| Pending Litigation
Details of commitments and contingencies
Number of claims filed \| claim							2
Stockholder Derivative Lawsuits \| Pending Litigation
Details of commitments and contingencies
Number of claims filed \| lawsuit					2
Number of claims consolidated \| claim	3
BIPA \| Privacy Class Action Lawsuits \| Minimum
Details of commitments and contingencies
Range of possible loss per aggrieved party		$ 1,000
BIPA \| Privacy Class Action Lawsuits \| Maximum
Details of commitments and contingencies
Range of possible loss per aggrieved party		$ 5,000
Multi-layered general liability policies
Details of commitments and contingencies
Excess liability coverage per occurrence										100,000,000.0
Self-insured retention per occurrence										2,000,000.0
Deductible per occurrence applicable to all claims in the policy year										500,000
Workers' compensation claims
Details of commitments and contingencies
Deductible per occurrence applicable to all claims in the policy year										750,000
Information security and privacy liability insurance policy
Details of commitments and contingencies
Self-insured retention per occurrence										250,000
Insurance value maintained										10,000,000.0
Amended And Restated Term Loan B As Amended June 2017
Details of commitments and contingencies
Additional contingent borrowing capacity										$ 350,000,000.0
Six Flags over Georgia
Details of commitments and contingencies
Limited partner interests owned (as a percent)										31.40%
Remaining redeemable units (as a percent)										68.60%
Six Flags over Texas
Details of commitments and contingencies
Units purchased in partnership parks (in units) \| shares				1.5675
Purchase price of partnership units				$ 3,400,000
Limited partner interests owned (as a percent)										53.90%
Remaining redeemable units (as a percent)										46.10%
Six Flags over Texas and Georgia
Details of commitments and contingencies
Share of Partnership Parks' annual distributions paid to Six Flags Entertainment Corporation										$ 33,300,000
Rolling period for making minimum capital expenditure at each of the Partnership Parks										5 years
Percentage of capital expenditures to Partnership Parks' revenues										6.00%
Weighted average period of the park's EBITDA for calculation of value of purchase price										4 years
Additions to property and equipment										$ 9,100,000
Cash generated from operating activities by partnerships, after deduction of capital expenditures and excluding the impact of short-term intercompany advances										$ 8,400,000
Six Flags over Georgia
Details of commitments and contingencies
Units purchased in partnership parks (in units) \| shares				0.375
Purchase price of partnership units				$ 1,500,000
Specified multiple for purchase price valuation (in multipliers) \| multiple										8.0
Specified price for purchase of partnership parks										$ 409,700,000
Six Flags over Texas
Details of commitments and contingencies
Units purchased in partnership parks (in units) \| shares								0.1
Purchase price of partnership units								$ 200,000
Specified multiple for purchase price valuation (in multipliers) \| multiple										8.5
Specified price for purchase of partnership parks										$ 527,400,000
Forecast \| Six Flags over Texas and Georgia
Details of commitments and contingencies
Annual distributions by general partners to limited partners in partnership parks									$ 75,200,000
Additions to property and equipment									$ 10,200,000