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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 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Numerator:                
Income from continuing operations attributable to Acadia Healthcare Company, Inc. $ 44,514       $ 27,038   $ 66,872 $ 45,412
Income (loss) from discontinued operations         14,041   (12,641) 29,130
Net income attributable to Acadia Healthcare Company, Inc. $ 44,514 $ 9,717 $ (783,672) $ 36,998 $ 41,079 $ 33,463 $ 54,231 $ 74,542
Denominator:                
Weighted average shares outstanding for basic earnings per share 88,842       87,872   88,543 87,818
Effects of dilutive instruments 1,748       736   1,838 410
Shares used in computing diluted earnings per common share 90,590       88,608   90,381 88,228
Basic earnings per share attributable to Acadia Healthcare Company, Inc. stockholders:                
Income from continuing operations attributable to Acadia Healthcare Company, Inc. $ 0.50       $ 0.31   $ 0.76 $ 0.52
Income (loss) from discontinued operations         0.16   (0.15) 0.33
Net income attributable to Acadia Healthcare Company, Inc. 0.50       0.47   0.61 0.85
Diluted earnings per share attributable to Acadia Healthcare Company, Inc. stockholders:                
Income from continuing operations attributable to Acadia Healthcare Company, Inc. 0.49       0.31   0.74 0.51
Income (loss) from discontinued operations         0.15   (0.14) 0.33
Net income attributable to Acadia Healthcare Company, Inc. $ 0.49       $ 0.46   $ 0.60 $ 0.84