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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, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Numerator:          
Income from continuing operations attributable to Acadia Healthcare Company, Inc. $ 22,358       $ 18,374
(Loss) income from discontinued operations (12,641)       15,089
Net income attributable to Acadia Healthcare Company, Inc. $ 9,717 $ (783,672) $ 36,998 $ 41,079 $ 33,463
Denominator:          
Weighted average shares outstanding for basic earnings per share 88,242       87,765
Effects of dilutive instruments 1,699       206
Shares used in computing diluted earnings per common share 89,941       87,971
Basic earnings per share attributable to Acadia Healthcare Company, Inc. stockholders:          
Income from continuing operations attributable to Acadia Healthcare Company, Inc. $ 0.25       $ 0.21
(Loss) income from discontinued operations (0.14)       0.17
Net income attributable to Acadia Healthcare Company, Inc. 0.11       0.38
Diluted earnings per share attributable to Acadia Healthcare Company, Inc. stockholders:          
Income from continuing operations attributable to Acadia Healthcare Company, Inc. 0.25       0.21
(Loss) income from discontinued operations (0.14)       0.17
Net income attributable to Acadia Healthcare Company, Inc. $ 0.11       $ 0.38