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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 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Numerator:                  
Income from continuing operations attributable to Acadia Healthcare Company, Inc. $ 66,126       $ 36,324     $ 132,998 $ 81,736
Income (loss) from discontinued operations         674     (12,641) 29,804
Net income attributable to Acadia Healthcare Company, Inc. $ 66,126 $ 44,514 $ 9,717 $ (783,672) $ 36,998 $ 41,079 $ 33,463 $ 120,357 $ 111,540
Denominator:                  
Weighted average shares outstanding for basic earnings per share 88,962       87,911     88,684 87,849
Effects of dilutive instruments 1,927       945     1,920 600
Shares used in computing diluted earnings per common share 90,889       88,856     90,604 88,449
Basic earnings per share attributable to Acadia Healthcare Company, Inc. stockholders:                  
Income from continuing operations attributable to Acadia Healthcare Company, Inc. $ 0.74       $ 0.41     $ 1.50 $ 0.93
Income (loss) from discontinued operations         0.01     (0.14) 0.34
Net income attributable to Acadia Healthcare Company, Inc. 0.74       0.42     1.36 1.27
Diluted earnings per share attributable to Acadia Healthcare Company, Inc. stockholders:                  
Income from continuing operations attributable to Acadia Healthcare Company, Inc. 0.73       0.41     1.47 0.92
Income (loss) from discontinued operations         0.01     (0.14) 0.34
Net income attributable to Acadia Healthcare Company, Inc. $ 0.73       $ 0.42     $ 1.33 $ 1.26