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Transaction, Legal and Other Costs - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Transaction Legal And Other Costs [Line Items] |  |  |
Legal, accounting and other acquisition-related costs | $ 11,172 | $ 12,705 | $ 5,778
New Facilities Development [Member] |  |  |
Transaction Legal And Other Costs [Line Items] |  |  |
Legal, accounting and other acquisition-related costs | 5,000 | 2,900 | 3,000
Cost Related to Certain Litigation [Member] |  |  |
Transaction Legal And Other Costs [Line Items] |  |  |
Legal, accounting and other acquisition-related costs | 4,800 | 8,800 | 2,600
Direct Costs Associated with Acquisitions [Member] |  |  |
Transaction Legal And Other Costs [Line Items] |  |  |
Legal, accounting and other acquisition-related costs | $ 1,400 | $ 1,000 | $ 200

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- 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

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- 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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |