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The CARES Act - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2023
CARES Act [Line Items]
Income from relief fund		$ 6,419
CARES Act [Member]
CARES Act [Line Items]
Offer of eligible relief amount	$ 100,000,000
CARES Act [Member] | American Rescue Plan
CARES Act [Line Items]
Income from relief fund		$ 6,400

X

- Definition

CARES Act.

+ References

No definition available.

+ Details

Name:	achc_CARESActLineItems
Namespace Prefix:	achc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The total amount of income from provider relief funds granted as part of the CARES Act.

+ References

No definition available.

+ Details

Name:	achc_IncomeFromProviderReliefFund
Namespace Prefix:	achc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The U.S. government offer of relief to eligible healthcare providers as part of the CARES Act.

+ References

No definition available.

+ Details

Name:	achc_TotalReliefToEligibleHealthcareProviders
Namespace Prefix:	achc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_UnusualOrInfrequentItemAxis=achc_CoronavirusAidReliefAndEconomicSecurityActMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PlanNameAxis=achc_AmericanRescuePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: