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The CARES Act - Additional Information (Detail) - USD ($) $ in Millions		1 Months Ended		3 Months Ended			12 Months Ended
	Apr. 24, 2020	Apr. 30, 2021	Aug. 31, 2020	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2020	Dec. 31, 2021
C A R E S Act [Line Items]
Expected repay of payroll tax deferrals					$ 39.0
Medicare [Member]
C A R E S Act [Line Items]
Additional repayment of advanced payments				$ 8.0
CARES Act [Member]
C A R E S Act [Line Items]
Offer of eligible relief amount						$ 100.0
Additional offer of eligible relief amount	$ 75.0
Remaining unrecognized funds				6.3			$ 6.3
Cash benefit relating to delay of payment of social security payroll taxes				39.0
CARES Act [Member] | Medicare [Member]
C A R E S Act [Line Items]
Repayment of advanced payments				$ 25.0
Percentage of increase in medicare reimbursement rate						2.00%
CARES Act [Member] | Public Health and Social Services Emergency Fund [Member]
C A R E S Act [Line Items]
Receipt of CARES Act of 2020 aid amount						$ 19.7
Receipt of additional CARES Act of 2020 aid amount		$ 24.2	$ 12.8
Income from relief fund							$ 17.9
CARES Act [Member] | CMS' Accelerated and Advance Payment Program [Member] | Medicare [Member]
C A R E S Act [Line Items]
Amount of advance payment received						$ 45.0

X

- Definition

Additional contract with customer liability advance repayments.

+ References

No definition available.

+ Details

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

X

- Definition

Additional relief received amount from U.S. government for eligible healthcare providers under the CARES Act.

+ References

No definition available.

+ Details

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

X

- Definition

Additional relief to eligible health care providers.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of advance payment received under the CARES Act.

+ References

No definition available.

+ Details

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

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

Cash benefit relating to delay of payment of social security payroll taxes.

+ References

No definition available.

+ Details

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

X

- Definition

Contract with customer liability advance repayments.

+ References

No definition available.

+ Details

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

X

- Definition

Expected repay of payroll tax deferrals.

+ References

No definition available.

+ Details

Name:	achc_ExpectedRepayOfPayrollTaxDeferrals
Namespace Prefix:	achc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

Received relief amount from U.S. government for eligible healthcare providers under the CARES Act.

+ References

No definition available.

+ Details

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

X

- Definition

Percentage of increase in medicare reimbursement rate.

+ References

No definition available.

+ Details

Name:	achc_PercentageOfIncreaseInMedicareReimbursementRate
Namespace Prefix:	achc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Remaining unrecognized funds.

+ References

No definition available.

+ Details

Name:	achc_RemainingUnrecognizedFunds
Namespace Prefix:	achc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- Details

Name:	srt_MajorCustomersAxis=achc_MedicareMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesAxis=achc_PublicHealthAndSocialServicesEmergencyFundMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Data Type:	na
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Period Type: