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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, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Numerator:                
Net income attributable to Acadia Healthcare Company, Inc. $ 72,299 $ 66,015 $ 61,124 $ 71,099 $ 80,079 $ 60,837 $ 138,314 $ 140,916
Denominator:                
Weighted average shares outstanding for basic earnings per share 91,044       89,724   90,691 89,492
Effects of dilutive instruments 502       1,749   949 2,012
Shares used in computing diluted earnings per common share 91,546       91,473   91,640 91,504
Basic earnings per share attributable to Acadia Healthcare Company, Inc. stockholders:                
Basic $ 0.79       $ 0.89   $ 1.53 $ 1.57
Diluted earnings per share attributable to Acadia Healthcare Company, Inc. stockholders:                
Diluted $ 0.79       $ 0.88   $ 1.51 $ 1.54