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Recently Issued Accounting Standards - Additional Information (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Jan. 01, 2019
--- | --- | ---
Change In Accounting Estimate [Line Items] |  |
Rright-of-use assets | $ 552,334 |
Lease liabilities | $ 584,392 |
ASU 2016-02 [Member] |  |
Change In Accounting Estimate [Line Items] |  |
Rright-of-use assets |  | $ 509,800
Lease liabilities |  | $ 536,700

X
- Definition Amount of lessee's obligation for lease payments total. + References No definition available. + Details
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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 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_ChangeInAccountingEstimateLineItems
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: |