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Other Accrued Liabilities - Additional Information (Detail) $ in Millions | 3 Months Ended
--- | ---
Sep. 30, 2021 USD ($)
Accounts Payable And Accrued Liabilities Current [Abstract] |
Purchase of leased property | $ 31.4

X
- Definition Purchase of leased property. + References No definition available. + Details
Name: | achc_PurchaseOfLeasedProperty
Namespace Prefix: | achc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration