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The CARES Act - Additional Information (Detail) - CARES Act [Member] - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
CARES Act [Line Items]
Offer of eligible relief amount	$ 100,000.0
American Rescue Plan
CARES Act [Line Items]
Income from relief fund		$ 6.4

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- Definition

CARES Act.

+ References

No definition available.

+ Details

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X

- Definition

The total amount of income from provider relief funds granted as part of the CARES Act.

+ References

No definition available.

+ Details

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Namespace Prefix:	achc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

The U.S. government offer of relief to eligible healthcare providers as part of the CARES Act.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Period Type: