XML 58 R47.htm IDEA: XBRL DOCUMENT
v3.20.2

Description of Business and Basis of Presentation - Additional Information (Detail) | 9 Months Ended
--- | ---
Sep. 30, 2020 Facility Bed State
Accounting Policies [Abstract] |
Number of facilities | Facility | 582
Number of beds | Bed | 18,300
Number of operating states | State | 40

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

X
- 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