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v3.20.4

Noncontrolling Interests - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2020 Facility
Noncontrolling Interest [Line Items] |
Number of facilities operated by non-wholly owned subsidiaries | 6
Non-Wholly Owned Subsidiaries [Member] | Minimum [Member] |
Noncontrolling Interest [Line Items] |
Equity ownership interests percentage in the facility | 60.00%
Non-Wholly Owned Subsidiaries [Member] | Maximum [Member] |
Noncontrolling Interest [Line Items] |
Equity ownership interests percentage in the facility | 86.00%

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- Definition Number of facilities operated by non-wholly owned subsidiaries. + References No definition available. + Details
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Namespace Prefix: | achc_
Data Type: | xbrli:integerItemType
Balance Type: | na
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
Name: | us-gaap_MinorityInterestLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
Name: | us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | srt_OwnershipAxis=achc_NonWhollyOwnedSubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |