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Other Accrued Liabilities - Additional Information (Detail) $ in Millions	1 Months Ended
	Jul. 31, 2021 USD ($)
Subsequent Event [Member]
Property Plant And Equipment [Line Items]
Purchase of leased property	$ 31

X

- Definition

Purchase of leased property.

+ References

No definition available.

+ Details

Name:	achc_PurchaseOfLeasedProperty
Namespace Prefix:	achc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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_PropertyPlantAndEquipmentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: