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v3.25.1

Transaction, Legal and Other Costs - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Transaction Legal And Other Costs [Line Items] |  |
Legal, accounting and other acquisition-related costs | $ (2,105) | $ 4,757
New Facilities Development [Member] |  |
Transaction Legal And Other Costs [Line Items] |  |
Legal, accounting and other acquisition-related costs | 900 | 600
Cost Related to Certain Litigation [Member] |  |
Transaction Legal And Other Costs [Line Items] |  |
Legal, accounting and other acquisition-related costs | $ (3,000) | 4,000
Direct Costs Associated with Acquisitions [Member] |  |
Transaction Legal And Other Costs [Line Items] |  |
Legal, accounting and other acquisition-related costs |  | $ 200

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
Period Type: | duration

X
- Definition Transaction Legal And Other Costs. + References No definition available. + Details
Name: | achc_TransactionLegalAndOtherCostsLineItems
Namespace Prefix: | achc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_NonrecurringAdjustmentAxis=achc_NewFacilitiesDevelopmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_NonrecurringAdjustmentAxis=achc_CostRelatedToCertainLitigationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_NonrecurringAdjustmentAxis=us-gaap_AcquisitionRelatedCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |