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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Numerator:                
Net income attributable to Acadia Healthcare Company, Inc. $ 48,140 $ 29,471 $ (331,637) $ 46,232 $ 58,836 $ 50,819 $ 77,611 $ 109,655
Denominator:                
Weighted average shares outstanding for basic earnings per share 87,618       87,303   87,562 87,205
Effect of dilutive instruments 219       164   208 146
Shares used in computing diluted earnings per common share 87,837       87,467   87,770 87,351
Earnings per share attributable to Acadia Healthcare Company, Inc. stockholders:                
Basic $ 0.55       $ 0.67   $ 0.89 $ 1.26
Diluted $ 0.55       $ 0.67   $ 0.88 $ 1.26