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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

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

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: