Entity Central Index Key Amount of revenues recognized by the entity from providing services to inpatient, outpatients and residents in facilities owned or operated by the entity. Amount of the provision for bad debts. 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. The amount of equity attributable to the parent company from its subsidiaries as of the balance sheet date. The cash inflow from the additional capital contribution to the entity, net of equity issuance costs. Common stock withheld to satisfy employee minimum statutory tax withholding obligations payable upon vesting net of common stock issued under stock incentive plans. The cash outflow (inflow) from an entity that is affiliated with the entity by means of direct or indirect ownership. Document and entity information. Document And Entity Information [Abstract] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Well Known Seasoned Issuer Entity Current Reporting Status Entity Current Reporting Status Entity Voluntary Filers Entity Voluntary Filers Entity Filer Category Entity Filer Category Entity Shell Company Entity Shell Company Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Entity Public Float Entity Public Float Statement Of Financial Position [Abstract] ASSETS Assets [Abstract] Current assets: Assets Current [Abstract] Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Accounts receivable, net Accounts Receivable Net Current Other current assets Other Assets Current Total current assets Assets Current Property and equipment: Property Plant And Equipment [Abstract] Land Land Building and improvements Buildings And Improvements Gross Equipment Machinery And Equipment Gross Construction in progress Construction In Progress Gross Less accumulated depreciation Accumulated Depreciation Depletion And Amortization Property Plant And Equipment Property and equipment, net Property Plant And Equipment Net Goodwill Goodwill Intangible assets, net Intangible Assets Net Excluding Goodwill Deferred tax assets Deferred Tax Assets Net Noncurrent Derivative instrument assets Derivative Instruments And Hedges Noncurrent Other assets Other Assets Noncurrent Total assets Assets LIABILITIES AND EQUITY Liabilities And Stockholders Equity [Abstract] Current liabilities: Liabilities Current [Abstract] Current portion of long-term debt Long Term Debt Current Accounts payable Accounts Payable Current Accrued salaries and benefits Employee Related Liabilities Current Other accrued liabilities Other Accrued Liabilities Current Total current liabilities Liabilities Current Long-term debt Long Term Debt Noncurrent Deferred tax liabilities Deferred Tax Liabilities Noncurrent Other liabilities Other Liabilities Noncurrent Total liabilities Liabilities Redeemable noncontrolling interests Redeemable Noncontrolling Interest Equity Carrying Amount Equity: Stockholders Equity [Abstract] Preferred stock, $0.01 par value; 10,000,000 shares authorized, no shares issued Preferred Stock Value Common stock, $0.01 par value; 180,000,000 shares authorized; 87,444,473 and 87,060,114 issued and outstanding as of December 31, 2018 and 2017, respectively Common Stock Value Additional paid-in capital Additional Paid In Capital Common Stock Accumulated other comprehensive loss Accumulated Other Comprehensive Income Loss Net Of Tax Retained earnings Retained Earnings Accumulated Deficit Total equity Stockholders Equity Total liabilities and equity Liabilities And Stockholders Equity Preferred stock, par value Preferred Stock Par Or Stated Value Per Share Preferred stock, authorized Preferred Stock Shares Authorized Preferred stock, issued Preferred Stock Shares Issued Common stock, par value Common Stock Par Or Stated Value Per Share Common stock, shares authorized Common Stock Shares Authorized Common stock, shares issued Common Stock Shares Issued Common stock, shares outstanding Common Stock Shares Outstanding Income Statement [Abstract] Revenue before provision for doubtful accounts Health Care Organization Revenues Provision for doubtful accounts Health Care Organization Patient Service Provision For Bad Debts Revenue Revenue From Contract With Customer Excluding Assessed Tax Salaries, wages and benefits (including equity-based compensation expense of $22,001, $23,467 and $28,345, respectively) Labor And Related Expense Professional fees Professional Fees Supplies Supplies Expense Rents and leases Lease And Rental Expense Other operating expenses Other Cost And Expense Operating Depreciation and amortization Depreciation And Amortization Interest expense, net Interest Income Expense Net Debt extinguishment costs Gains Losses On Extinguishment Of Debt Legal settlements expense Litigation Settlement Expense Loss on impairment Asset Impairment Charges Loss on divestiture Gain Loss On Sale Of Business Gain on foreign currency derivatives Gain Loss On Foreign Currency Derivative Instruments Not Designated As Hedging Instruments Transaction-related expenses Business Combination Acquisition Related Costs Total expenses Operating Expenses (Loss) income before income taxes Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest Provision for income taxes Income Tax Expense Benefit Net (loss) income Profit Loss Net (income) loss attributable to noncontrolling interests Net Income Loss Attributable To Noncontrolling Interest Net (loss) income attributable to Acadia Healthcare Company, Inc. Net Income Loss Earnings per share attributable to Acadia Healthcare Company, Inc. stockholders: Earnings Per Share Basic And Diluted [Abstract] Basic Earnings Per Share Basic Diluted Earnings Per Share Diluted Weighted-average shares outstanding: Weighted Average Number Of Shares Outstanding [Abstract] Basic Weighted Average Number Of Shares Outstanding Basic Diluted Weighted Average Number Of Diluted Shares Outstanding Equity-based compensation expense Share Based Compensation Statement Of Income And Comprehensive Income [Abstract] Net (loss) income Other comprehensive (loss) income: Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract] Foreign currency translation (loss) gain Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax Gain (loss) on derivative instruments, net of tax of $12.7 million, $(22.9) million and $29.1, respectively Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax Pension liability adjustment, net of tax of $0.3 million, $0.4 million and $(1.3) million, respectively Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax Other comprehensive (loss) gain Other Comprehensive Income Loss Net Of Tax Comprehensive (loss) income Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest Comprehensive (income) loss attributable to noncontrolling interests Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest Comprehensive (loss) income attributable to Acadia Healthcare Company, Inc. Comprehensive Income Net Of Tax Loss on derivative instruments, tax Other Comprehensive Income Derivatives Qualifying As Hedges Tax Portion Attributable To Parent Pension liability adjustment, tax Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax Common stock withheld to satisfy employee minimum statutory tax withholding obligations payable upon vesting. Statement Of Stockholders Equity [Abstract] Statement [Table] Statement [Table] Accumulated Other Comprehensive Loss [Member] Statement Equity Components [Axis] Equity Component Equity Component [Domain] Common Stock [Member] Common Stock [Member] Additional Paid-in Capital [Member] Additional Paid In Capital [Member] Accumulated Other Comprehensive Loss [Member] Accumulated Other Comprehensive Income [Member] Earnings (Accumulated Deficit) [Member] Retained Earnings [Member] Statement [Line Items] Statement [Line Items] Balance Balance, shares Common stock issued under stock incentive plans Stock Issued During Period Value Stock Options Exercised Common stock issued under stock incentive plans, shares Stock Issued During Period Shares Stock Options Exercised Common stock withheld for minimum statutory taxes Common Stock Withheld For Minimum Statutory Taxes Equity-based compensation expense Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value Cumulative effect of change in accountingprinciple New Accounting Pronouncement Or Change In Accounting Principle Effect Of Adoption Quantification Issuance of common stock, net Stock Issued During Period Value New Issues Issuance of common stock, net, shares Stock Issued During Period Shares New Issues Other comprehensive loss Other Adjustments To Additional Paid In Capital Other Net income (Loss) attributable to Acadia Healthcare Company, Inc. stockholders Balance Balance, shares Statement Of Cash Flows [Abstract] Operating activities: Net Cash Provided By Used In Operating Activities [Abstract] Net (loss) income Adjustments to reconcile net (loss) income to net cash provided by continuing operating activities: Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Amortization of debt issuance costs Amortization Of Financing Costs Deferred income taxes Deferred Income Tax Expense Benefit Other Other Noncash Income Expense Change in operating assets and liabilities, net of effect of acquisitions: Increase Decrease In Operating Capital [Abstract] Accounts receivable, net Increase Decrease In Accounts Receivable Other current assets Increase Decrease In Other Current Assets Other assets Increase Decrease In Other Operating Assets Accounts payable and other accrued liabilities Increase Decrease In Accounts Payable And Accrued Liabilities Accrued salaries and benefits Increase Decrease In Employee Related Liabilities Other liabilities Increase Decrease In Other Current Liabilities Net cash provided by continuing operating activities Net Cash Provided By Used In Operating Activities Continuing Operations Net cash used in discontinued operating activities Cash Provided By Used In Operating Activities Discontinued Operations Net cash provided by operating activities Net Cash Provided By Used In Operating Activities Investing activities: Net Cash Provided By Used In Investing Activities [Abstract] Cash paid for acquisitions, net of cash acquired Payments To Acquire Businesses Net Of Cash Acquired Cash paid for capital expenditures Payments To Acquire Property Plant And Equipment Cash paid for real estate acquisitions Payments To Acquire Real Estate Settlement of foreign currency derivatives Payments For Proceeds From Derivative Instrument Investing Activities Cash received on divestitures Proceeds From Divestiture Of Businesses Other Payments For Proceeds From Other Investing Activities Net cash used in investing activities Net Cash Provided By Used In Investing Activities Financing activities: Net Cash Provided By Used In Financing Activities [Abstract] Borrowings on long-term debt Proceeds From Issuance Of Long Term Debt Borrowings on revolving credit facility Proceeds From Lines Of Credit Principal payments on revolving credit facility Repayments Of Long Term Lines Of Credit Principal payments on long-term debt Repayments Of Secured Debt Repayment of assumed debt Repayments Of Debt Repayment of long-term debt Repayments Of Long Term Debt Payment of debt issuance costs Payments Of Debt Issuance Costs Issuances of common stock, net Proceeds From Issuance Of Common Stock Net Common stock withheld for minimum statutory taxes, net Common Stock Withheld For Minimum Statutory Taxes Net Other Proceeds From Payments For Other Financing Activities Net cash (used in) provided by financing activities Net Cash Provided By Used In Financing Activities Effect of exchange rate changes on cash Effect Of Exchange Rate On Cash And Cash Equivalents Net (decrease) increase in cash and cash equivalents Cash And Cash Equivalents Period Increase Decrease Cash and cash equivalents at beginning of the period Cash and cash equivalents at end of the period Supplemental Cash Flow Information: Supplemental Cash Flow Information [Abstract] Cash paid for interest Interest Paid Cash paid for income taxes Income Taxes Paid Net Effect of acquisitions: Noncash Investing And Financing Items [Abstract] Assets acquired, excluding cash Fair Value Of Assets Acquired Liabilities assumed Liabilities Assumed1 Issuance of common stock in connection with acquisition Proceeds From Issuance Of Common Stock Cash paid for acquisitions, net of cash acquired Accounting Policies [Abstract] Description of Business and Basis of Presentation Business Description And Basis Of Presentation [Text Block] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Revenue From Contract With Customer [Abstract] Revenue Revenue From Contract With Customer [Text Block] Earnings Per Share [Abstract] Earnings Per Share Earnings Per Share [Text Block] Business Combinations [Abstract] Acquisitions Business Combination Disclosure [Text Block] Goodwill And Intangible Assets Disclosure [Abstract] Other Intangible Assets Intangible Assets Disclosure [Text Block] Debt Disclosure [Abstract] Long-Term Debt Long Term Debt [Text Block] Equity [Abstract] Equity Stockholders Equity Note Disclosure [Text Block] Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] Equity-Based Compensation Disclosure Of Compensation Related Costs Share Based Payments [Text Block] Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Derivative Instruments And Hedging Activities Disclosure [Abstract] Derivatives Derivative Instruments And Hedging Activities Disclosure [Text Block] Fair Value Disclosures [Abstract] Fair Value Measurements Fair Value Disclosures [Text Block]