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v3.20.2

Leases - Additional Information (Detail) | 6 Months Ended
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Jun. 30, 2020
Minimum [Member] |
Lessee Lease Description [Line Items] |
Lessee operating and finance lease term of contract | 5 years
Maximum [Member] |
Lessee Lease Description [Line Items] |
Lessee operating and finance lease term of contract | 30 years
Copiers and Equipment [Member] | Minimum [Member] |
Lessee Lease Description [Line Items] |
Lessee operating and finance lease term of contract | 1 year
Copiers and Equipment [Member] | Maximum [Member] |
Lessee Lease Description [Line Items] |
Lessee operating and finance lease term of contract | 3 years

X
- Definition Lessee operating and finance lease term of contract. + References No definition available. + Details
Name: | achc_LesseeOperatingAndFinanceLeaseTermOfContract
Namespace Prefix: | achc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

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

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

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=achc_CopiersAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |