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Financial Information for the Company and Its Subsidiaries - Additional Information (Detail)
Mar. 31, 2015
12.875% Senior Notes Due 2018 [Member]  
Line of Credit Facility [Line Items]  
Debt instrument interest rate 12.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= achc_TwelvePointEightSevenFivePercentageSeniorNotesDueTwoThousandAndEighteenMember
6.125% Senior Notes Due 2021 [Member]  
Line of Credit Facility [Line Items]  
Debt instrument interest rate 6.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= achc_SixPointOneTwoFivePercentSeniorNotesDueTwoThousandTwentyOneMember
5.125% Senior Notes due 2022 [Member]  
Line of Credit Facility [Line Items]  
Debt instrument interest rate 5.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= achc_FivePointOneTwoFivePercentageSeniorNotesDueInTwoThousandTwentyTwoMember
5.625% Senior Notes Due 2023 [Member]  
Line of Credit Facility [Line Items]  
Debt instrument interest rate 5.625%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= achc_FivePointSixTwoFivePercentageSeniorNotesDueTwoThousandTwentyThreeMember