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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 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Numerator:                  
Net (loss) income attributable to Acadia Healthcare Company, Inc. $ (217,710) $ 72,299 $ 66,015 $ 61,124 $ 71,099 $ 80,079 $ 60,837 $ (79,396) $ 212,015
Denominator:                  
Weighted average shares outstanding for basic earnings per share 91,168       89,833     90,852 89,607
Effects of dilutive instruments         1,890       2,061
Shares used in computing diluted earnings per common share 91,168       91,723     90,852 91,668
Basic earnings per share attributable to Acadia Healthcare Company, Inc. stockholders:                  
Basic $ (2.39)       $ 0.79     $ (0.87) $ 2.37
Diluted earnings per share attributable to Acadia Healthcare Company, Inc. stockholders:                  
Diluted $ (2.39)       $ 0.78     $ (0.87) $ 2.31