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v3.21.1

Description of Business and Basis of Presentation - Additional Information (Detail) | 3 Months Ended
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Mar. 31, 2021 Facility Bed State
Accounting Policies [Abstract] |
Number of facilities | Facility | 228
Number of beds | Bed | 10,000
Number of operating states | State | 40

X
- Definition The number of licensed beds at the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | achc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The number of facilities the entity operates as of the balance sheet date. + References No definition available. + Details
Name: | achc_NumberOfFacilities
Namespace Prefix: | achc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of states the entity operates in as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant