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Revenue - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024
Revenue From Contract With Customer [Abstract]
Revenue recognized	$ 65.6
Revenue unrecognized		$ 14.3	$ 34.4

X

- Definition

Contract with customer, liability, revenue unrecognized.

+ References

No definition available.

+ Details

Name:	achc_ContractWithCustomerLiabilityRevenueUnrecognized
Namespace Prefix:	achc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-8

+ Details

Name:	us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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