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Transaction, Legal and Other Costs - Transaction, Legal and Other Costs as Incurred (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Transaction, Legal and Other Costs [Abstract]
Government investigations	$ 38,737	$ 3,102	$ 123,274	$ 5,635
Termination and restructuring costs	3,206	718	15,446	(1,263)
Legal, accounting and other acquisition-related costs	976	2,939	(304)	9,730
Management transition costs	0	1,490	0	3,085
Transaction, legal and other costs	$ 42,919	$ 8,249	$ 138,416	$ 17,187

X

- Definition

Government investigations.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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
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X

- Definition

Management transition costs.

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Transaction, legal and other costs.

+ References

No definition available.

+ Details

Name:	achc_TransactionLegalAndOtherCostsAbstract
Namespace Prefix:	achc_
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Balance Type:	na
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X

- Definition

Amount of expense for acquisition-related cost incurred to effect business combination. Includes, but is not limited to, finder's fee; advisory, legal, accounting, valuation, and other professional and consulting fees; and general administrative cost, including cost of maintaining internal acquisition department.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479328/805-10-50-7

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 25
-Paragraph 23
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479405/805-10-25-23

+ Details

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- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

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