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Other Accrued Liabilities - Additional Information (Detail) $ in Millions	3 Months Ended
	Sep. 30, 2021 USD ($)
Accounts Payable And Accrued Liabilities Current [Abstract]
Purchase of leased property	$ 31.4

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

- References

No definition available.

+ Details

Name:	us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration