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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, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Numerator:                
Net income attributable to Acadia Healthcare Company, Inc. $ 30,127 $ 8,374 $ 32,615 $ 68,132 $ 78,482 $ 76,383 $ 38,501 $ 154,865
Denominator:                
Weighted average shares outstanding for basic earnings per share 90,328       91,628   90,987 91,495
Effects of dilutive instruments 107       415   413 556
Shares used in computing diluted earnings per common share 90,435       92,043   91,400 92,051
Basic earnings per share attributable to Acadia Healthcare Company, Inc. stockholders:                
Basic $ 0.33       $ 0.86   $ 0.42 $ 1.69
Diluted earnings per share attributable to Acadia Healthcare Company, Inc. stockholders:                
Diluted $ 0.33       $ 0.85   $ 0.42 $ 1.68