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Transaction, Legal and Other Costs - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Transaction Legal And Other Costs [Line Items]
Legal, accounting and other acquisition-related costs	$ 8,500	$ 11,172	$ 12,705
New Facilities Development [Member]
Transaction Legal And Other Costs [Line Items]
Legal, accounting and other acquisition-related costs	2,100	5,000	2,900
Cost Related to Certain Litigation [Member]
Transaction Legal And Other Costs [Line Items]
Legal, accounting and other acquisition-related costs	6,300	4,800	8,800
Direct Costs Associated with Acquisitions [Member]
Transaction Legal And Other Costs [Line Items]
Legal, accounting and other acquisition-related costs	$ 100	$ 1,400	$ 1,000

X

- Definition

Amount of expenses for legal, accounting and other fees associated with a business acquisition.

+ References

No definition available.

+ Details

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

X

- Definition

Transaction Legal And Other Costs.

+ References

No definition available.

+ Details

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Namespace Prefix:	achc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_NonrecurringAdjustmentAxis=achc_NewFacilitiesDevelopmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_NonrecurringAdjustmentAxis=achc_CostRelatedToCertainLitigationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_NonrecurringAdjustmentAxis=us-gaap_AcquisitionRelatedCostsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: