Payment of debt breakage costs.

No definition available.

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

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
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+ Details

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- 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

No definition available.

+ Details

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

- Definition

End date of debt instrument redemption period, in YYYY-MM-DD format.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
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+ Details

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

- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

+ References

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-Publisher FASB
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-Topic 944
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+ Details

Name:	us-gaap_SeniorNotes
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Long-Term Debt (Redemption of 5.265% Senior Notes and 6.500% Senior Notes) - Additional Information (Detail) - USD ($) $ in Thousands				12 Months Ended
	Mar. 17, 2021	Mar. 01, 2021	Jan. 29, 2021	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Debt extinguishment costs				$ (24,650)	$ (7,233)
Redemption of 5.265% Senior Notes [Member]
Debt Instrument [Line Items]
Senior Notes			$ 650,000
Debt instrument interest rate			5.625%
Debt extinguishment costs	$ 3,300
Redemption of 6.500% Senior Notes [Member]
Debt Instrument [Line Items]
Senior Notes			$ 390,000
Debt instrument interest rate			6.50%
Debt extinguishment costs		$ 10,500
Cash paid for breakage costs		6,300
Write off of deferred financing costs		$ 4,200
Redemption of 5.265% Senior Notes and 6.500% Senior Notes [Member]
Debt Instrument [Line Items]
Term loan remaining balance due date			Jan. 29, 2021