XML 16 R45.htm IDEA: XBRL DOCUMENT v3.19.3

Description of Business and Basis of Presentation - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2019 Facility Bed State
Accounting Policies [Abstract]
Number of facilities | Facility	589
Number of beds | Bed	18,000
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