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v3.19.3

Segment Information - Additional Information (Detail) | 9 Months Ended
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Sep. 30, 2019 Facility Bed State
Segment Reporting Information [Line Items] |
Number of facilities | Facility | 589
Number of beds | Bed | 18,000
Number of operating states | State | 40
U.S. Facilities [Member] |
Segment Reporting Information [Line Items] |
Number of facilities | Facility | 224
Number of beds | Bed | 9,300
Number of operating states | State | 40
U.K. Facilities [Member] |
Segment Reporting Information [Line Items] |
Number of facilities | Facility | 365
Number of beds | Bed | 8,700

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
- 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

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

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=achc_UnitedStatesFacilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=achc_UnitedKingdomFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |