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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 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Numerator:                      
Income from continuing operations attributable to Acadia Healthcare Company, Inc.                 $ 140,258 $ 52,111 $ 57,224
(Loss) income from discontinued operations                 (812,390) 56,812 (232,974)
Net (loss) income attributable to Acadia Healthcare Company, Inc. $ (783,672) $ 36,998 $ 41,079 $ 33,463 $ (11,254) $ 42,566 $ 48,140 $ 29,471 $ (672,132) $ 108,923 $ (175,750)
Denominator:                      
Weighted average shares outstanding for basic earnings per share                 87,875 87,612 87,288
Effects of dilutive instruments                 720 204 127
Shares used in computing diluted earnings per common share                 88,595 87,816 87,415
Basic earnings (loss) per share attributable to Acadia Healthcare Company, Inc. stockholders:                      
Income from continuing operations attributable to Acadia Healthcare Company, Inc. $ 0.51 $ 0.51 $ 0.34 $ 0.24 $ (0.15) $ 0.28 $ 0.31 $ 0.16 $ 1.60 $ 0.59 $ 0.66
(Loss) income from discontinued operations (9.42) (0.09) 0.13 0.14 0.02 0.21 0.24 0.18 (9.25) 0.65 (2.67)
Net (loss) income attributable to Acadia Healthcare Company, Inc. (8.91) 0.42 0.47 0.38 (0.13) 0.49 0.55 0.34 (7.65) 1.24 (2.01)
Diluted earnings (loss) per share attributable to Acadia Healthcare Company, Inc. stockholders:                      
Income from continuing operations attributable to Acadia Healthcare Company, Inc. 0.50 0.50 0.34 0.23 (0.15) 0.28 0.31 0.15 1.58 0.59 0.65
(Loss) income from discontinued operations (9.28) (0.08) 0.12 0.15 0.02 0.20 0.24 0.19 (9.17) 0.65 (2.66)
Net (loss) income attributable to Acadia Healthcare Company, Inc. $ (8.78) $ 0.42 $ 0.46 $ 0.38 $ (0.13) $ 0.48 $ 0.55 $ 0.34 $ (7.59) $ 1.24 $ (2.01)