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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
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Numerator:          
Net income attributable to Acadia Healthcare Company, Inc. $ 66,015 $ 61,124 $ 71,099 $ 80,079 $ 60,837
Denominator:          
Weighted average shares outstanding for basic earnings per share 90,101       89,258
Effects of dilutive instruments 1,290       1,754
Shares used in computing diluted earnings per common share 91,391       91,012
Basic earnings per share attributable to Acadia Healthcare Company, Inc. stockholders:          
Basic $ 0.73       $ 0.68
Diluted earnings per share attributable to Acadia Healthcare Company, Inc. stockholders:          
Diluted $ 0.72       $ 0.67