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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
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Numerator:      
(Loss) income from continuing operations attributable to Acadia Healthcare Company, Inc. $ (21,667) $ 273,139 $ 203,276
Loss from discontinued operations     (12,641)
Net (loss) income attributable to Acadia Healthcare Company, Inc. $ (21,667) $ 273,139 $ 190,635
Denominator:      
Weighted average shares outstanding for basic earnings per share 90,949 89,680 88,769
Effects of dilutive instruments   1,875 2,024
Shares used in computing diluted earnings per common share 90,949 91,555 90,793
Basic (loss) earnings per share attributable to Acadia Healthcare Company, Inc. stockholders:      
(Loss) income from continuing operations attributable to Acadia Healthcare Company, Inc. $ (0.24) $ 3.05 $ 2.29
Loss from discontinued operations     (0.14)
Net (loss) income attributable to Acadia Healthcare Company, Inc. (0.24) 3.05 2.15
Diluted (loss) earnings per share attributable to Acadia Healthcare Company, Inc. stockholders:      
(Loss) income from continuing operations attributable to Acadia Healthcare Company, Inc. (0.24) 2.98 2.24
Loss from discontinued operations     (0.14)
Net (loss) income attributable to Acadia Healthcare Company, Inc. $ (0.24) $ 2.98 $ 2.1