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Description of Business and Basis of Presentation - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2021 Facility Bed State
Accounting Policies [Abstract]
Number of facilities | Facility	228
Number of beds | Bed	10,000
Number of operating states | State	40

X

- Definition

The number of licensed beds at the balance sheet date.

+ References

No definition available.

+ Details

Name:	achc_NumberOfBeds
Namespace Prefix:	achc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of facilities the entity operates as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	achc_NumberOfFacilities
Namespace Prefix:	achc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

The number of states the entity operates in as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant