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Revenue - Additional Information (Detail) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Revenue From Contract With Customer [Abstract] |  |
Revenue recognized | $ 65.6 |
Revenue unrecognized |  | $ 34.4

X
- Definition Contract with customer liability recognized revenue. + References No definition available. + Details
Name: | achc_ContractWithCustomerLiabilityRecognizedRevenue
Namespace Prefix: | achc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Contract with customer, liability, revenue unrecognized. + References No definition available. + Details
Name: | achc_ContractWithCustomerLiabilityRevenueUnrecognized
Namespace Prefix: | achc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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