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Revenue - Additional Information (Detail) - CARES Act [Member] - CMS’ Accelerated and Advance Payment Program [Member] - Medicare [Member] - USD ($) $ in Millions	1 Months Ended	4 Months Ended
	Apr. 30, 2020	Nov. 30, 2020
Disaggregation of Revenue [Line Items]
Amount of advance payment received	$ 45
Scenario Forecast [Member]
Disaggregation of Revenue [Line Items]
Repayment of advance amount		$ 45

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

Repayment of advance amount.

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DisaggregationOfRevenueLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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_TypeOfArrangementAxis=achc_CMSAcceleratedAndAdvancePaymentProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: