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Leases - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)
Loss on Impairment [Member]
Lessee Lease Description [Line Items]
Non-cash operating lease right-of-use asset impairment charge related to closure of facilities	$ 2.3
Minimum [Member]
Lessee Lease Description [Line Items]
Lessee operating and finance lease term of contract	5 years
Maximum [Member]
Lessee Lease Description [Line Items]
Lessee operating and finance lease term of contract	30 years
Copiers and Equipment [Member] | Minimum [Member]
Lessee Lease Description [Line Items]
Lessee operating and finance lease term of contract	1 year
Copiers and Equipment [Member] | Maximum [Member]
Lessee Lease Description [Line Items]
Lessee operating and finance lease term of contract	3 years

X

- Definition

Lessee operating and finance lease term of contract.

+ References

No definition available.

+ Details

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Namespace Prefix:	achc_
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Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147478964/842-20-50-3

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

X

- Definition

Amount of loss from impairment of right-of-use asset from operating lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 25
-Paragraph 6
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479365/842-20-25-6

+ Details

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- Details

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- Details

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- Details

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- Details

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