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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