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Leases - Additional Information (Detail) - USD ($) $ in Thousands |  | 9 Months Ended
--- | --- | ---
Jan. 01, 2019 | Sep. 30, 2019
Lessee Lease Description [Line Items] |  |
Right-of-use assets |  | $ 524,207
Lease liabilities |  | $ 557,364
Operating leases remaining lease term | 1 year |
ASU 2016-02 [Member] |  |
Lessee Lease Description [Line Items] |  |
Right-of-use assets | $ 500,300 |
Lease liabilities | $ 526,600 |
Minimum [Member] |  |
Lessee Lease Description [Line Items] |  |
Lessee operating and finance lease term of contract |  | 5 years
Minimum [Member] | Copiers and Equipment [Member] |  |
Lessee Lease Description [Line Items] |  |
Lessee operating and finance lease term of contract |  | 1 year
Maximum [Member] |  |
Lessee Lease Description [Line Items] |  |
Lessee operating and finance lease term of contract |  | 30 years
Maximum [Member] | Copiers and Equipment [Member] |  |
Lessee Lease Description [Line Items] |  |
Lessee operating and finance lease term of contract |  | 3 years

X
- Definition Amount of lessee's obligation for lease payments total. + References No definition available. + Details
Name: | achc_LeaseLiability
Namespace Prefix: | achc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of lessee's right of use underlying assets total. + References No definition available. + Details
Name: | achc_LeaseRightOfUseAsset
Namespace Prefix: | achc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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 Lessee operating leases remaining lease term. + References No definition available. + Details
Name: | achc_LesseeOperatingLeasesRemainingLeaseTerm
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: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201602Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
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: |

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