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1078 - Disclosure - Equity-Based Compensation - Restricted Stock Activity (Detail)
(http://www.acadiahealthcare.com/taxonomy/role/DisclosureEquityBasedCompensationRestrictedStockActivity)
TableSchedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001520697 (http://www.sec.gov/CIK)
Award Type [Axis]Restricted Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
Unvested, Number of Shares/Units, Beginning balance
944,562  
722,028  
Granted, Number of Shares
387,347  
503,052  
Cancelled, Number of Shares
(122,178) 
(44,900) 
Vested, Number of Shares
(365,312) 
(235,618) 
Unvested, Number of Shares/Units, Ending balance
844,419  
 
944,562  
 
Unvested, Weighted Average Grant-Date Fair Value, Beginning balance
52.74  
39.77  
Granted, Weighted Average Grant-Date Fair Value
55.38  
62.67  
Cancelled, Weighted Average Grant-Date Fair Value
57.02  
49.55  
Vested, Weighted Average Grant-Date Fair Value
47.18  
34.93  
Unvested, Weighted Average Grant-Date Fair Value, Ending balance
55.76  
52.74