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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

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- Definition Amount of advance payment received under the CARES Act. + References No definition available. + Details
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Namespace Prefix: | achc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Repayment of advance amount. + References No definition available. + Details
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Namespace Prefix: | achc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | us-gaap_TypeOfArrangementAxis=achc_CMSAcceleratedAndAdvancePaymentProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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