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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, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Numerator:          
Income from continuing operations attributable to Acadia Healthcare Company, Inc. $ 60,837       $ 22,358
Loss from discontinued operations         (12,641)
Net income attributable to Acadia Healthcare Company, Inc. $ 60,837 $ 70,278 $ 66,126 $ 44,514 $ 9,717
Denominator:          
Weighted average shares outstanding for basic earnings per share 89,258       88,242
Effects of dilutive instruments 1,754       1,699
Shares used in computing diluted earnings per common share 91,012       89,941
Basic earnings per share attributable to Acadia Healthcare Company, Inc. stockholders:          
Income from continuing operations attributable to Acadia Healthcare Company, Inc. $ 0.68       $ 0.25
Loss from discontinued operations         (0.14)
Net income attributable to Acadia Healthcare Company, Inc. 0.68       0.11
Diluted earnings per share attributable to Acadia Healthcare Company, Inc. stockholders:          
Income from continuing operations attributable to Acadia Healthcare Company, Inc. 0.67       0.25
Loss from discontinued operations         (0.14)
Net income attributable to Acadia Healthcare Company, Inc. $ 0.67       $ 0.11