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Earnings Per Share - Computation of Basic and Diluted (Loss) Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Numerator:      
Net (loss) income attributable to Acadia Healthcare Company, Inc. $ (1,102,772) $ 255,612 $ (21,667)
Denominator:      
Weighted-average shares outstanding for basic earnings per share 90,705 91,621 90,949
Effects of dilutive instruments 0 438 0
Shares used in computing diluted earnings per common share 90,705 92,059 90,949
Basic Earnings (loss) per share attributable to Acadia Healthcare Company, Inc. stockholders:      
Basic $ (12.16) $ 2.79 $ (0.24)
Diluted Earnings (loss) per share attributable to Acadia Healthcare Company, Inc. stockholders:      
Diluted $ (12.16) $ 2.78 $ (0.24)