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Component: (Network and Table)
Network
1101 - Disclosure - Employee Benefit Plans - Summary of Components of Net Pension Plan Expense (Detail)
(http://www.acadiahealthcare.com/taxonomy/role/DisclosureEmployeeBenefitPlansSummaryOfComponentsOfNetPensionPlanExpense)
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
Interest cost on projected benefit obligation
1,964,000  
2,369,000  
Service cost on projected benefit obligation
 
616,000  
Curtailments on projected benefit obligation
 
(1,373,000) 
Expected return on assets
(1,625,000) 
(2,031,000) 
Total pension plan expense (benefit)
339,000  
 
(419,000)