The CARES Act - Additional Information (Detail) - CARES Act [Member] - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2024	Dec. 31, 2023
CARES Act [Line Items]
Offer of eligible relief amount	$ 100.0
American Rescue Plan
CARES Act [Line Items]
Income from relief fund		$ 6.4

The U.S. government offer of relief to eligible healthcare providers as part of the CARES Act.

No definition available.

Name:	achc_TotalReliefToEligibleHealthcareProviders
Namespace Prefix:	achc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration