v3.26.1
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, 2026
Mar. 31, 2026
Dec. 31, 2025
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Numerator:                
Net income attributable to Acadia Healthcare Company, Inc. $ 10,928 $ 4,105 $ (1,177,519) $ 36,246 $ 30,127 $ 8,374 $ 15,033 $ 38,501
Denominator:                
Weighted average shares outstanding for basic earnings per share 90,817       90,328   90,675 90,987
Effects of dilutive instruments 557       107   530 413
Shares used in computing diluted earnings per common share 91,374       90,435   91,205 91,400
Basic earnings per share attributable to Acadia Healthcare Company, Inc. stockholders:                
Basic $ 0.12       $ 0.33   $ 0.17 $ 0.42
Diluted earnings per share attributable to Acadia Healthcare Company, Inc. stockholders:                
Diluted $ 0.12       $ 0.33   $ 0.16 $ 0.42