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v3.25.3

Transaction, Legal and Other Costs - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Transaction Legal And Other Costs [Line Items] |  |  |  |
Legal, accounting and other acquisition-related costs | $ 976 | $ 2,939 | $ (304) | $ 9,730
New Facilities Development [Member] |  |  |  |
Transaction Legal And Other Costs [Line Items] |  |  |  |
Legal, accounting and other acquisition-related costs | 500 | 1,900 | 1,900 | 3,900
Cost Related to Certain Litigation [Member] |  |  |  |
Transaction Legal And Other Costs [Line Items] |  |  |  |
Legal, accounting and other acquisition-related costs | 400 | 100 | (2,300) | 4,500
Direct Costs Associated with Acquisitions [Member] |  |  |  |
Transaction Legal And Other Costs [Line Items] |  |  |  |
Legal, accounting and other acquisition-related costs | $ 100 | $ 1,000 | $ 100 | $ 1,400

X
- Definition Amount of expenses for legal, accounting and other fees associated with a business acquisition. + References No definition available. + Details
Name: | achc_LegalAccountingAndOtherAcquisitionRelatedCosts
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: |