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Disaggregation of Revenue [Line Items] 2031 senior unsecured notes at 7.250% 2031 notes at 7.250% 2031 Senior Notes at 7.250% [Member] 2031 Senior Notes at 7.250% Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Disposal Group Name [Domain] Disposal Group Name [Domain] Total net assets acquired Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less) Underlying Security Market Price Change Underlying Security Market Price Change, Percent Property and equipment, net Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Specified multiple for purchase price valuation Purchase Price Valuation Specified Multiplier The specified multiple for each of the partnership parks for calculation and valuation of purchase prices. 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Secured Debt [Member] Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] Revolving credit loans Long-Term Line of Credit, Noncurrent Total costs and expenses Costs and Expenses Adoption Date Trading Arrangement Adoption Date Non-cash equity compensation expense Share-Based Payment Arrangement, Noncash Expense, Adjusted Share-Based Payment Arrangement, Noncash Expense, Adjusted Interest rate (as percent) Debt Instrument, Interest Rate, Stated Percentage Counterparty Name [Domain] Counterparty Name [Domain] Total Equity Beginning balance Ending balance Equity, Attributable to Parent Disposal Group, Disposed of by Sale, Not Discontinued Operations Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Other assets Business Combination, Recognized Asset Acquired, Other Asset, Noncurrent ASSETS Assets [Abstract] Title Trading Arrangement, Individual Title Forgone Recovery due to 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Variable Rate [Domain] Business Combination, Consideration Transferred, Equity Interest, Type [Axis] Business Combination, Consideration Transferred, Equity Interest, Type [Axis] Debt Instrument, Redemption, Period One Debt Instrument, Redemption, Period One [Member] Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Property and equipment, gross Property and equipment, gross Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, before Accumulated Depreciation and Amortization All Individuals All Individuals [Member] Schedule of Net Revenues and Income (Loss) Before Taxes by Domestic and Foreign Properties Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue [Table Text Block] Name Forgone Recovery, Individual Name Contingencies Commitments and Contingencies, Policy [Policy Text Block] Redemption of original face amount (as percent) Debt Instrument, Covenant, Leverage Ratio 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and Reclassification Adjustment, Attributable to Parent Total liabilities assumed Business Combination, Recognized Liability Assumed, Liability Lease liabilities Business Combination, Recognized Liability Assumed, Lease Obligation (Increase) decrease in other assets Increase (Decrease) in Other Operating Assets PEO PEO [Member] Management fees rate (as percent) Management and Service Fees, Rate Measurement Basis [Axis] Measurement Basis [Axis] Other liabilities Other Liabilities, Noncurrent Goodwill Goodwill Net goodwill, beginning balance Net goodwill, ending balance Goodwill Inventories Business Combination, Recognized Asset Acquired, Inventory, Current Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Mergers Goodwill, Acquired During Period Receivables Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Current Assets, Receivables Business Combination, Provisional 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Common stock, shares outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Payment of debt issuance costs Payments of Debt Issuance Costs Diluted (in dollars per share) Earnings Per Share, Diluted Entity Current Reporting Status Entity Current Reporting Status Net cash (for) from financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Total indebtedness to consolidated cash flow ratio requirement Total Indebtedness To Consolidated Cash Flow Ratio Requirement Total Indebtedness To Consolidated Cash Flow Ratio Requirement Self-insurance reserves Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Self-Insurance Reserves Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Self-Insurance Reserves Litigation Case [Domain] Litigation Case [Domain] Intangible Asset, Finite-Lived [Line Items] Intangible Asset, Finite-Lived [Line Items] Schedule of Computation of Estimated Fair value of Consideration Transferred Business Combination [Table Text Block] Lease liabilities Operating And Finance Lease Liability, Noncurrent Operating And Finance Lease Liability, Noncurrent General partner ownership interest (as percent) Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest Other accrued liabilities Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Accrued Liabilities Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Accrued Liabilities Ownership [Domain] Ownership [Domain] Total assets acquired Business Combination, Recognized Asset Acquired, Asset Former Six Flags revolving credit facility repaid upon close of the Mergers Business Combination, Consideration Transferred, Repayment Of Debt Business Combination, Consideration Transferred, Repayment Of Debt CASH FLOWS (FOR) FROM FINANCING ACTIVITIES Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Available borrowings under revolving credit facility Line of Credit Facility, Remaining Borrowing Capacity Interest cost Defined Benefit Plan, Interest Cost California's Great America California's Great America [Member] California's Great America Limited liability company or limited partnership, members or limited partners, ownership interest (as percent) Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest Fair value of redeemable non-controlling interests Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value Seven Parks Seven Parks [Member] Seven Parks Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Goodwill and Other Intangible Assets Intangible Asset and Goodwill [Text Block] Underlying Securities Award Underlying Securities Amount Comprehensive income attributable to non-controlling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Gross Carrying Amount Intangible Asset, Excluding Goodwill, before Accumulated Amortization Revenue Recognition Revenue from Contract with Customer [Text Block] The Partnership Parks Subsidiaries, Six Flags Over Texas And Georgia [Member] Subsidiaries, Six Flags Over Texas And Georgia Disposal group, including discontinued operation, ownership percentage in disposed asset Disposal Group, Including Discontinued Operation, Ownership Percentage In Disposed Asset Disposal Group, Including Discontinued Operation, Ownership Percentage In Disposed Asset Increase (decrease) in accrued interest Increase (Decrease) in Interest Payable, Net Specified price for purchase of partnership parks Purchase Price Valuation Threshold Price Represents the threshold purchase price of partnership parks. Litigation recoveries Litigation Settlement Receivable, Current Litigation Settlement Receivable, Current Construction in progress Construction in Progress [Member] (Increase) decrease in inventories Increase (Decrease) in Inventories Amortization payments Debt Instrument, Periodic Payment, Principal Segment Reporting [Table] Segment Reporting [Table] Escrow receivables Escrow Deposit Other current assets Other Assets, Current All Trading Arrangements All Trading Arrangements [Member] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Six Flags Over Texas Six Flags Over Texas [Member] Represents Six Flags Over Texas, one of the "Partnership Parks". Operating income (loss) Operating Income (Loss) Current Fiscal Year End Date Current Fiscal Year End Date Total merger consideration, net of cash acquired Business Combination, Consideration Transferred, Including Redeemable Noncontrolling Interest, Net Of Cash Acquired Business Combination, Consideration Transferred, Including Redeemable Noncontrolling Interest, Net Of Cash Acquired Term debt borrowings Proceeds from Issuance of Debt Loss on disposal group Loss on disposal group Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Mergers Business Combination [Text Block] Long-lived assets Long-Lived Asset, Excluding Financial Instrument, Customer Relationship, Mortgage Servicing Right, Deferred Policy Acquisition Cost, and Deferred Tax Asset, Amount Fair value of notes Notes Payable, Fair Value Disclosure Equity-based compensation (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, before Forfeiture Food, merchandise and games Food, Merchandise and Gaming [Member] Food, Merchandise and Gaming [Member] Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Dividend declared (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Securities Class Action Lawsuits Securities Class Action Lawsuits [Member] Securities Class Action Lawsuits Distributions paid to non-controlling interests Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Gain on purchase of units at put option price Redeemable Noncontrolling Interest, Liability, Gain (Loss) On Purchase Redeemable Noncontrolling Interest, Liability, Gain (Loss) On Purchase 2032 senior unsecured notes at 8.625% 2032 notes at 8.625% 2032 Senior Notes at 8.625% [Member] 2032 Senior Notes at 8.625% Common stock, shares, issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] CORRA Canadian Overnight Repo Rate Average [Member] Canadian Overnight Repo Rate Average Equity Components [Axis] Equity Components [Axis] Product and Service [Domain] Product and Service [Domain] Net cash payments for income taxes Income Tax Paid, after Refund Received Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Entity Interactive Data Current Entity Interactive Data Current Debt instrument, redemption price, percentage outstanding, minimum Debt Instrument, Redemption Price, Percentage Outstanding, Minimum Debt Instrument, Redemption Price, Percentage Outstanding, Minimum Variable Rate [Axis] Variable Rate [Axis] Net income attributable to non-controlling interests Add: Net income attributable to non-controlling interests Net Income (Loss) Attributable to Noncontrolling Interest Deferred tax liabilities Deferred Income Tax Liabilities, Net Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Limited Partner Limited Partner [Member] Entity Small Business Entity Small Business Comprehensive loss attributable to Six Flags Entertainment Corporation Comprehensive Income (Loss), Net of Tax, Attributable to Parent Termination Date Trading Arrangement Termination Date Noncontrolling Interest [Table] Noncontrolling Interest [Table] Property, Plant, and Equipment [Line Items] Property, Plant, and Equipment [Line Items] Inventories Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Rides and equipment Rides And Equipment [Member] Rides And Equipment Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Defined benefit retirement plan Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Other assets Other Assets, Noncurrent Document Type Document Type Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Payment of outstanding pre-merger Special Dividend per the Merger Agreement Business Combination, Consideration Transferred, Payment Of Dividends Business Combination, Consideration Transferred, Payment Of Dividends Loss on early debt extinguishment Loss on early debt extinguishment Gain (Loss) on Extinguishment of Debt Fair Value as of Grant Date Award Grant Date Fair Value Debt instrument, redemption price, percentage Debt Instrument, Redemption Price, Percentage Description of the Business and Significant Accounting Policies Significant Accounting Policies [Text Block] Deferred Stock Units Deferred Stock Units [Member] Deferred Stock Units Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Impairment of intangible assets Intangible Asset, Excluding Goodwill, Impairment Loss Deferred revenue Business Combination, Recognized Liability Assumed, Deferred Revenue, Current Operating expenses Operating Costs and Expenses Arrangement Duration Trading Arrangement Duration Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Non-current deferred revenue Contract with Customer, Liability, Noncurrent Canada CANADA Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name (Loss) income before taxes (Loss) income before taxes (Loss) income before taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Commitments and contingencies (Note 1) Commitments and Contingencies Net revenues Net revenues Revenues Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Domain] Term debt 2017 Credit Agreement [Member] 2017 Credit Agreement [Member] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Change In Carrying Value [Roll Forward] Equity, Attributable to Noncontrolling Interest [Roll Forward] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] Restricted Payment Prior To Merger Restricted Payments, As Amended [Member] Restricted Payments, As Amended Agreed-upon value for the partnerships Redeemable Noncontrolling Interest, Equity, Agreed Upon Value Redeemable Noncontrolling Interest, Equity, Agreed Upon Value Amusement, Water Parks and Resort Facilities Segment Amusement, Water Parks And Resort Facilities Segment [Member] Amusement, Water Parks And Resort Facilities Segment Goodwill [Roll Forward] Goodwill [Roll Forward] Counterparty Name [Axis] Counterparty Name [Axis] LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Accrued taxes Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accrued Income Taxes Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accrued Income Taxes Trade names Trade Names [Member] NCI call option liability Noncontrolling Interest Call Option, Liability, Noncurrent Noncontrolling Interest Call Option, Liability, Noncurrent Accrued salaries, wages and benefits Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accrued Salaries, Wages and Benefits Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accrued Salaries, Wages and Benefits Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Inventories Inventory, Net Award Type [Domain] Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Fair Value Measurements Fair Value Disclosures [Text Block] SUPPLEMENTAL INFORMATION Supplemental Cash Flow Information [Abstract] Debt instrument, redemption price, percentage of principal amount redeemed Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed PEO Name PEO Name Geographical [Axis] Geographical [Axis] Other segment expenses Segment Reporting, Other Segment Item, Amount Long-Lived Asset, Class [Axis] Long-Lived Asset, Class [Axis] Less: cash acquired Cash Acquired from Acquisition Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Legal Entity [Axis] Legal Entity [Axis] Adjusted Allocation Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill [Abstract] Self-insurance reserves Self Insurance Reserve, Current Balance, beginning of period Balance, end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Proforma net secured leverage ratio Debt Instrument, Proforma Net Secured Leverage Ratio Debt Instrument, Proforma Net Secured Leverage Ratio Partnership parks, cash distribution after management fee (as percent) Partnership Parks, Cash Distribution Percentage, After Management Fee Partnership Parks, Cash Distribution Percentage, After Management Fee Rolling period for making minimum capital expenditure at each of the partnership parks (in years) Loss Contingency, Rolling Period For Minimum Capital Expenditures Represents the rolling period for making minimum capital expenditure at each of the Partnership Parks. Schedule of Indefinite And Finite-Lived Intangible Assets by Major Class [Table] Intangible Asset, Finite-Lived [Table] Increase (decrease) in accounts payable Increase (Decrease) in Accounts Payable Other intangibles, net Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Indefinite-Lived Other accrued liabilities Other Accrued Liabilities, Current Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Base Rate Base Rate [Member] Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Comprehensive loss Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Debt Instrument [Axis] Debt Instrument [Axis] Reporting Unit [Domain] Reporting Unit [Domain] Other liabilities Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent Non-cash equity based compensation expense Share-Based Payment Arrangement, Noncash Expense Percentage of capital expenditures to partnership parks' revenues Capital Expenditure As Percentage Of Partnership Parks Revenue Represents the capital expenditure based on certain percentage of partnership parks revenue. Interest capitalized Interest Paid, Capitalized, Investing Activity Plus acquisition fair value layers Acquisition fair value layers Debt Instrument, Business Combination, Fair Value Layers Debt Instrument, Business Combination, Fair Value Layers Disposal Group Name [Axis] Disposal Group Name [Axis] Purchase of redeemable non-controlling interests Payments for Repurchase of Redeemable Noncontrolling Interest Cash generated from operating activities by partnerships, after deduction of capital expenditures and excluding the impact of short-term intercompany advances Partnership Parks, Net Cash Provided by (Used in) Operating Activities, Continuing Operations The net cash from (used in) the partnership parks' continuing operations. Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Basic (in dollars per share) Earnings Per Share, Basic Deferred revenue Current deferred revenue Contract with Customer, Liability, Current Total current assets Assets, Current Costs related to the Mergers Noncash Merger Related Costs Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Total long-term debt Long-Term Debt, Excluding Current Maturities Short-term investments Short Term Investments, Fair Value Disclosure Short Term Investments, Fair Value Disclosure Award Type [Axis] Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Receivables Accounts Receivable, after Allowance for Credit Loss, Current Total assets acquired Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Assets Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Assets Accumulated deficit Retained Earnings (Accumulated Deficit) Product and Service [Axis] Product and Service [Axis] Deferred revenue Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Current Liabilities, Deferred Revenue Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Current Liabilities, Deferred Revenue Lease liabilities Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Lease Obligation Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Lease Obligation Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Canadian Prime Rate Canadian Prime Rate [Member] Canadian Prime Rate Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Shares of Common Stock Outstanding Common Stock Common Stock [Member] Non-cash loss on disposal group Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal Fair Value Measurement [Domain] Fair Value Measurement [Domain] Number of monthly installments (in installments) Revenue, Number Of Monthly Installments Per Purchase Plan Revenue, Number Of Monthly Installments Per Purchase Plan Current maturities of long-term debt Business Combination, Recognized Liability Assumed, Long-Term Debt, Current Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] Foreign Foreign Non-US [Member] Noncontrolling Interest [Abstract] Foreign currency translation Goodwill, Foreign Currency Translation, Gain (Loss) Measurement Period Adjustments Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments [Abstract] Equity Awards Adjustments Equity Awards Adjustments [Member] Estimated increase in depreciation expense Estimated Increase In Depreciation Estimated Increase In Depreciation Total Liabilities and Equity Liabilities and Equity Self-insurance reserves Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Self Insurance Reserve Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Self Insurance Reserve Stock Options Employee Stock Option Share-Based Payment Arrangement, Option [Member] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table] Schedule of Weighted Average Assumptions Used to Determine Net Cost Defined Benefit Plan, Assumptions [Table Text Block] Segments [Axis] Segments [Axis] Other intangibles, net Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles Increase (decrease) in other liabilities Increase (Decrease) in Other Operating Liabilities Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Plan Name [Axis] Plan Name [Axis] Tabular List, Table Tabular List [Table Text Block] Additional paid-in-capital Additional Paid in Capital Adjusted EBITDA Earnings Before Interest Tax Depreciation And Amortization, Adjusted Earnings Before Interest Tax Depreciation And Amortization, Adjusted Other expense (income), net Other Nonoperating Income (Expense) Long-Term Debt Long-Term Debt [Text Block] Income tax receivables Income Taxes Receivable, Current Name Awards Close in Time to MNPI Disclosures, Individual Name Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Schedule of Changes in Put and Carrying Value of Georgia and Texas Partnership Redeemable Noncontrolling Interest [Table Text Block] Interest accretion Redeemable Noncontrolling Interest, Interest Accretion Redeemable Noncontrolling Interest, Interest Accretion Long-Lived Asset, Class [Domain] Long-Lived Asset, Class [Domain] Corporate ownership interest (as percent) Merger Agreement, Ownership Interest Merger Agreement, Ownership Interest Property, Plant, and Equipment [Table] Property, Plant, and Equipment [Table] Adjustment to Compensation: Adjustment to Compensation [Axis] Other current assets Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Current Assets Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Current Assets Goodwill Goodwill [Member] Former Six Flags Former Six Flags [Member] Former Six Flags Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Cash payments for interest Interest Paid, Excluding Capitalized Interest, Operating Activity Capital expenditures Payments to Acquire Productive Assets Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Credit Facility [Axis] Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Labor Cost, Direct Labor Name Measure Name Business Combination, Consideration Transferred, Equity Interest, Type [Domain] Business Combination, Consideration Transferred, Equity Interest, Type [Domain] Income Taxes Income Tax Disclosure [Text Block] Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Accounts payable Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Current Liabilities, Accounts Payable Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Current Liabilities, Accounts Payable Mexico MEXICO Debt Instrument [Line Items] Debt Instrument [Line Items] Accrued interest Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accrued Interest Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accrued Interest Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Weighted average period of the park's EBITDA for calculation of value of purchase price (in years) Purchase Price Valuation Period Of Partnership Park Weighted Average Earnings Before Interest Tax Depreciation And Amortization Represents the period of Weighted average EBITDA used for deriving the value of the purchase price. Working capital adjustments Disposal Group, Working Capital Adjustments Disposal Group, Working Capital Adjustments Fair value of purchase consideration transferred Business Combination, Consideration Transferred Additional Paid-in-Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Intangible Asset, Indefinite-Lived, Class [Axis] Intangible Asset, Indefinite-Lived, Class [Axis] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and Cash Equivalent Discount rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Interest rate during period (as percent) Debt Instrument, Interest Rate During Period Company Selected Measure Amount Company Selected Measure Amount SOFR Secured Overnight Financing Rate (SOFR) [Member] Long-term debt: Long-Term Debt, Excluding Current Maturities [Abstract] Net loss Net loss Net loss Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Current assets: Assets, Current [Abstract] Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Provision (benefit) for taxes Income tax provision (benefit) Income Tax Expense (Benefit) Adjustments to reconcile net loss to net cash from operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Noncash Item [Abstract] Cost of food, merchandise, and games revenues Cost of Product and Service Sold Cost of food, merchandise and games revenues Cost of Product And Service Sold, Adjusted Cost of Product And Service Sold, Adjusted Award Timing Method Award Timing Method [Text Block] Net increase for the period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Notes Notes Payable, Noncurrent Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] First lien leverage ratio Debt Instrument, Leverage Ratio, First Debt Instrument, Leverage Ratio, First Loss contingency payable Loss Contingency, Accrual, Current Deferred tax liabilities Business Combination, Recognized Liability Assumed, Deferred Tax Liability Amortization of net actuarial loss Defined Benefit Plan, Amortization of Gain (Loss) Schlitterbahn Schlitterbahn [Member] Schlitterbahn Net loss attributable to Six Flags Entertainment Corporation Net loss attributable to Six Flags Entertainment Corporation Net loss attributable to Six Flags Entertainment Corporation Net Income (Loss) Attributable to Parent Less current portion Long Term Debt, Gross, Current Maturities Long Term Debt, Gross, Current Maturities Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Statement [Table] Statement [Table] Restatement Determination Date: Restatement Determination Date [Axis] Units purchased in partnership parks (in shares) Partners' Capital Account, Units, Acquisitions Self-Insurance Reserves Self Insurance Reserve [Policy Text Block] Settlement amount awarded Litigation Settlement, Amount Awarded to Other Party Accommodations, extra-charge products and other Accommodations, Extra-Charge Products And Other [Member] Accommodations, Extra-Charge Products and Other [Member] Property and equipment, net Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment Equity Awards Share-Based Payment Arrangement [Member] Net borrowings on revolving credit loans Proceeds from (Repayments of) Lines of Credit Six Flags American And Hurricane Harbor Six Flags American And Hurricane Harbor [Member] Six Flags American And Hurricane Harbor Net revenues: Revenues [Abstract] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]