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1103 - Disclosure - Employee Benefit Plans - Schedule of Weighted-Average Asset Allocation by Asset Category in Partnerships in Care Pension Plan (Detail)
(http://www.acadiahealthcare.com/taxonomy/role/DisclosureEmployeeBenefitPlansScheduleOfWeightedAverageAssetAllocationByAssetCategoryInPartnershipsInCarePensionPlan)
TableSchedule of Defined Benefit Plans Disclosures [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001520697 (http://www.sec.gov/CIK)
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]Partnership in Care Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
Defined Benefit Plan, Asset Categories [Axis]Defined Benefit Plan, Asset Categories [Axis]
Cash and Cash Equivalents [Member]U.K. Government Obligation [Member]Annuity Contracts [Member]Equity Securities [Member]Debt Securities [Member]Other [Member]Cash and Cash Equivalents [Member]U.K. Government Obligation [Member]Annuity Contracts [Member]Equity Securities [Member]Debt Securities [Member]Other [Member]
Weighted-average asset allocation
1.50%  
14.50%  
41.60%  
26.30%  
12.10%  
4.00%  
1.70%  
3.80%  
46.50%  
35.70%  
8.50%  
3.80%