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Text Block [Abstract] American Rescue Plan American Rescue Plan [Member] American rescue plan. Cost Related to Certain Litigation [Member] Cost Related to Certain Litigation. Cost Related to Certain Litigation [Member] Fair Value By Balance Sheet Grouping [Table] Fair Value By Balance Sheet Grouping [Table] Variable interest entity, ownership percentage Variable Interest Entity Ownership Percentage Schedule Of Finite And Indefinite Lived Intangible Assets Table [Text Block] Schedule of finite and indefinite lived intangible assets. Other Identifiable Intangible Assets Disaggregation of Revenue [Line Items] Disaggregation Of Revenue [Line Items] Change in operating assets and liabilities, net of effect of acquisitions: Increase Decrease In Operating Capital [Abstract] Vesting period Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1 Other Other Assets Miscellaneous Current Transaction Legal And Other Costs [Table] Transaction Legal And Other Costs. 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Subsequent Events [Text Block] Subsequent Events Long-Term Debt Long Term Debt [Text Block] Remaining unrecognized provider relief funds Remaining Unrecognized Provider Relief Funds Remaining unrecognized provider relief funds. Standby Letters of Credit [Member] Standby Letters Of Credit [Member] Expected volatility Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Legal, accounting and other acquisition-related costs Legal Accounting And Other Acquisition Related Costs Amount of expenses for legal, accounting and other fees associated with a business acquisition. 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Workers’ compensation deposits – current portion Workers Compensation Deposits Amount of asset related to deposits paid in advance for workers compensation insurance claims that provide economic benefits within a future period of one year or the normal operating cycle, if longer. Options exercisable, Ending balance Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number Total expenses Disposal Group Including Discontinued Operation Operating Expense Fashion Valley [Member] Fashion Valley. Net proceeds from sale of business Net Proceeds From Divestiture Of Businesses Before Cash Retained By Buyer Net ​proceeds ​from ​divestiture ​of businesses before cash retained by buyer. 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Goodwill, Acquired During Period Increase from acquisitions Disposal Group Classification Disposal Group Classification [Axis] Entity File Number Entity File Number Adjustments To Additional Paid In Capital Other Other Revenue Revenue From Contract With Customer [Text Block] Change in Accounting Principle, Accounting Standards Update, Immaterial Effect Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] Equipment [Member] Equipment [Member] Location, Statement of Income, Balance [Axis] Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum Risk free interest rate, minimum Retained Earnings [Member] Retained Earnings (Accumulated Deficit) [Member] Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share, Total Loss from discontinued operations Income Loss From Discontinued Operations Net Of Tax Per Diluted Share Other Proceeds From Payments For Other Financing Activities Consolidated senior secured net leverage ratio Consolidated Senior Secured Net Leverage Ratio Consolidated senior secured net leverage ratio. 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Contributions from noncontrolling partners in joint ventures Proceeds From Dividends Received Stock Compensation Plan [Member] Stock Compensation Plan [Member] Liabilities assumed Liabilities Assumed Financing activities: Net Cash Provided By Used In Financing Activities [Abstract] Indefinite-Lived Intangible Assets, Major Class Name Indefinite Lived Intangible Assets Major Class Name [Domain] Consolidated Entities Consolidated Entities [Axis] Awarded plaintiff damages amount Loss Contingency, Damages Awarded, Value Entity Tax Identification Number Entity Tax Identification Number Goodwill, Impairment Loss Decrease from impairment of goodwill Equity Component Equity Component [Domain] Indefinite-Lived Intangible Assets (Excluding Goodwill), Ending Balance Indefinite-Lived Intangible Assets (Excluding Goodwill), Beginning Balance Indefinite-Lived Intangible Assets (Excluding Goodwill), Total Intangible assets not subject to amortization, Gross Carrying Amount Indefinite Lived Intangible Assets Excluding Goodwill Entity Address, City or Town Entity Address City Or Town Total Intangible Assets Accumulated Amortization Carrying Amount Intangible Assets Accumulated Amortization Carrying Amount Less: unamortized debt issuance costs, discount and premium Debt Instrument Unamortized Issuance Costs Discount Premium Net Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees) and debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized. 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Goodwill And Intangible Assets Disclosure [Text Block] Goodwill and Other Intangible Assets Intangible Asset, Excluding Goodwill, Indefinite-Lived, Impairment Loss, Statement of Income or Comprehensive Income [Extensible Enumeration] Antidilutive Security, Excluded EPS Calculation [Table] Carrying Amount [Member] Fair Value By Measurement Basis [Axis] Denominator: Weighted-average shares outstanding: Weighted Average Number Of Shares Outstanding [Abstract] Options granted, Aggregate Intrinsic Value Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Intrinsic Value The aggregate intrinsic value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Contract liabilities Contract With Customer Liability Current Statement [Table] Statement [Table] Income before income taxes Income before income taxes Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest Entity Shell Company Entity Shell Company Expected life (in years) Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 Net cash used in investing activities Net Cash Provided By Used In Investing Activities Statement [Line Items] Statement [Line Items] 5.500% Senior Notes due 2028 [Member] Five Point Five Zero Zero Percent Senior Notes Due Two Thousand Twenty Eight [Member] Five point five zero zero percent senior notes due two thousand twenty eight. 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Insurance receivable – current portion Insurance Receivable For Malpractice Current Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Table] Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Table] Business Acquisition, Acquiree Business Acquisition Acquiree [Domain] Construction in Progress [Member] Construction In Progress [Member] Receipt of additional CARES Act of 2020 aid amount Additional Relief Received Additional relief received amount from U.S. government for eligible healthcare providers under the CARES Act. Litigation Settlement, Fee Expense Legal settlements expense Licenses and Accreditations [Member] Licensing Agreements [Member] Debt Instrument, Redemption, Period Debt Instrument Redemption Period [Domain] Cash from the balance sheet to reduce debt, amount Payments Of Debt Extinguishment Costs Subsequent Events [Abstract] Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract] Date entered into an agreement Line Of Credit Facility Initiation Date1 Supplies Supplies Expense Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] Granted, Weighted Average Grant-Date Fair Value Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value Basic earnings per share attributable to Acadia Healthcare Company, Inc. stockholders: Earnings Per Share Basic [Abstract] Amortization of debt issuance costs Amortization Of Financing Costs Current assets: Assets Current [Abstract] Loss Contingency, Damages Paid, Value Defendants paid in exchange for release of liability Finance lease liabilities Finance Lease Liability Current Document Fiscal Year Focus Document Fiscal Year Focus Common Stock, Shares, Outstanding, Ending Balance Common Stock, Shares, Outstanding, Beginning Balance Common stock, shares outstanding Common Stock Shares Outstanding Accrued expenses Accrued Expense Current Amount of accrued expense classified as other, due within one year or the normal operating cycle, if longer. Additional offer of eligible relief amount Additional Relief To Eligible Health Care Providers Additional relief to eligible health care providers. Business Acquisition [Line Items] Business Combination [Line Items] Remaining Balance Scenario Forecast [Member] Common stock repurchased and cancelled shares Stock Repurchased and Retired During Period, Shares Change in Accounting Principle, Accounting Standards Update, Adopted Change in Accounting Principle, Accounting Standards Update, Adopted [true false] Operating lease liabilities Operating Lease Liability Noncurrent Senior notes maturity year Debt Instrument Maturity Year Date when the debt instrument is scheduled to be fully repaid. 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Amendment Flag Amendment Flag Loss Contingencies [Table] Loss Contingencies [Table] Summary of Changes in Goodwill Goodwill [Table Text Block] Equity-Based Compensation Disclosure Of Compensation Related Costs Share Based Payments [Text Block] Incremental term loans. Incremental Term Loans [Member] Specialty Treatment Facilities [Member] Specialty Treatment Facilities [Member] Specialty treatment facilities. Debt Instrument Debt Instrument [Axis] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] SOFR [Member] Schedule Of Variable Interest Entities [Table] Schedule Of Variable Interest Entities [Table] City Area Code City Area Code Business Combination, Pro Forma Information, Nonrecurring Adjustment [Domain] Carrying Amount [Member] Carrying Reported Amount Fair Value Disclosure [Member] Organization Consolidation And Presentation Of Financial Statements [Abstract] Residential Treatment Centers [Member] Residential Treatment Centers [Member] Residential treatment centers. Cost Report Receivable Current Cost report receivable current. Cost report receivable Acute Inpatient Psychiatric Facilities [Member] Acute Inpatient Psychiatric Facilities [Member] Acute inpatient psychiatric facilities. Management transition costs Management Transition Costs Management transition costs. Options cancelled, Aggregate Intrinsic Value Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Aggregate Intrinsic Value The aggregate intrinsic value of the accumulated differences between the fair values on underlying shares and exercises prices to acquire such shares as of the grant date on options that were either forfeited or lapsed. Transaction, legal and other costs. Transaction, Legal and Other Costs [Abstract] Debt Instrument, Redemption, Period Debt Instrument Redemption Period [Axis] Number of facilities operated by non-wholly owned subsidiaries Number Of Facilities Operated By Non Wholly Owned Subsidiaries Number of facilities operated by non-wholly owned subsidiaries. Income from continuing operations attributable to Acadia Healthcare Company, Inc. 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Accounts Payable And Accrued Liabilities Current [Abstract] Accounts Payable and Accrued Liabilities, Current [Abstract] Business Exit Costs1 Termination and restructuring costs Contributions from noncontrolling partners in joint ventures Proceeds From Contributions From Affiliates Options exercisable, Weighted Average Remaining Contractual Term, Ending balance Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 Other Current Assets Other Current Assets [Text Block] Total current liabilities Current liabilities Liabilities Current Effect of acquisitions: Noncash Investing and Financing Items [Abstract] Other Accrued Liabilities Other Liabilities Disclosure [Text Block] Property, Plant and Equipment, Gross, Ending Balance Property, Plant and Equipment, Gross, Beginning Balance Property, Plant and Equipment, Gross, Total Property and equipment, gross Property Plant And Equipment Gross Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations, Total Cash and cash equivalents at beginning of the period Cash and cash equivalents at end of the period Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations Government Investigation [Member] Government Investigation [Member] Segment Reporting [Text Block] Segments Derivative Instruments And Hedging Activities Disclosure [Abstract] Collaborative Arrangement and Arrangement Other than Collaborative Type Of Arrangement [Axis] Trading Symbol Trading Symbol Reinsurance policy aggregate policy limit Malpractice Insurance Annual Coverage Limit U.K. Sales [Member] U K Sales [Member] U.K. sales. 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Repayments of Senior Debt, Total Repayment of long-term debt Repayments Of Senior Debt Schedule Of Business Acquisitions By Acquisition [Table] Schedule Of Business Acquisitions By Acquisition [Table] Options exercised, Aggregate Intrinsic Value Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value Revenue, Percentage Percentage Of Net Health Care Organization Revenue Percentage of net health care organization revenue. Cover [Abstract] Unused fee payable percentage Line Of Credit Facility Unused Capacity Commitment Fee Percentage New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Schedule Of Sharebased Compensation Restricted Stock And Restricted Stock Units Activity Table [Text Block] Restricted Stock Awards Activity Revenue from Contract with Customer [Abstract] Revenue From Contract With Customer [Abstract] Extraordinary And Unusual Items [Abstract] Long-Term Debt, Type Longterm Debt Type [Domain] Professional fees Professional Fees Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent, Total Loss from discontinued operations Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity Other Current Assets Schedule Of Other Current Assets Table [Text Block] Share-Based Payment Arrangement, Noncash Expense, Total Equity-based compensation expense Share Based Compensation Schedule Of Finite and Indefinite Lived Other Intangible Assets [Line Items] Schedule Of Finite And Indefinite Lived Other Intangible Assets [Line Items] Schedule of finite and indefinite lived other intangible assets. 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