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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, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Numerator:          
Net income attributable to Acadia Healthcare Company, Inc. $ 76,383 $ 57,729 $ (217,710) $ 72,299 $ 66,015
Denominator:          
Weighted average shares outstanding for basic earnings per share 91,363       90,101
Effects of dilutive instruments 647       1,290
Shares used in computing diluted earnings per common share 92,010       91,391
Basic earnings per share attributable to Acadia Healthcare Company, Inc. stockholders:          
Basic $ 0.84       $ 0.73
Diluted earnings per share attributable to Acadia Healthcare Company, Inc. stockholders:          
Diluted $ 0.83       $ 0.72