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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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator:
Net income (Loss) attributable to Acadia Healthcare Company, Inc. stockholders	$ (11,254)	$ 42,566	$ 48,140	$ 29,471	$ (331,637)	$ 46,232	$ 58,836	$ 50,819	$ 108,923	$ (175,750)	$ 199,835
Denominator:
Weighted average shares outstanding for basic earnings per share									87,612	87,288	86,948
Effects of dilutive instruments									204		112
Shares used in computing diluted earnings per common share									87,816	87,288	87,060
Earnings per share attributable to Acadia Healthcare Company, Inc. stockholders:
Basic	$ (0.13)	$ 0.49	$ 0.55	$ 0.34	$ (3.80)	$ 0.53	$ 0.67	$ 0.58	$ 1.24	$ (2.01)	$ 2.30
Diluted	$ (0.13)	$ 0.48	$ 0.55	$ 0.34	$ (3.80)	$ 0.53	$ 0.67	$ 0.58	$ 1.24	$ (2.01)	$ 2.30

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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