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v3.24.3

Description of Business and Basis of Presentation - Additional Information (Detail) | 9 Months Ended
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Sep. 30, 2024 State Bed Facility
Accounting Policies [Abstract] |
Number of facilities | Facility | 260
Number of beds | Bed | 11,300
Number of operating states | State | 38

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

X
- 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