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Document and Entity Information - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2024
Feb. 27, 2025
Jun. 30, 2024
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2024    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Trading Symbol ACHC    
Entity Registrant Name ACADIA HEALTHCARE COMPANY, INC.    
Entity Central Index Key 0001520697    
Current Fiscal Year End Date --12-31    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Title of 12(b) Security Common Stock, $.01 par value    
Security Exchange Name NASDAQ    
Entity File Number 001-35331    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 45-2492228    
Entity Address, Address Line One 6100 Tower Circle    
Entity Address, Address Line Two Suite 1000    
Entity Address, City or Town Franklin    
Entity Address, State or Province TN    
Entity Address, Postal Zip Code 37067    
City Area Code 615    
Local Phone Number 861-6000    
Document Annual Report true    
Document Transition Report false    
Entity Common Stock, Shares Outstanding   92,913,042  
Entity Public Float     $ 6.1
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Auditor Name Ernst & Young LLP    
Auditor Location Nashville, Tennessee    
Auditor Firm ID 42    
Auditor Opinion

Opinion on Internal Control Over Financial Reporting

We have audited Acadia Healthcare Company, Inc.’s internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) (the COSO criteria). In our opinion, Acadia Healthcare Company, Inc. (the Company) maintained, in all material respects, effective internal control over financial reporting as of December 31, 2024, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated balance sheets of the Company as of December 31, 2024 and 2023, the related consolidated statements of operations, equity and cash flows for each of the three years in the period ended December 31, 2024, and the related notes and our report dated February 27, 2025 expressed an unqualified opinion thereon.

    
Documents Incorporated by Reference

Portions of the registrant’s definitive proxy statement for its 2025 annual meeting of stockholders to be held on May 29, 2025 are incorporated by reference into Part III of this Form 10-K.