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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, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator:
Net income attributable to Acadia Healthcare Company, Inc.	$ 36,998	$ 41,079	$ 33,463	$ (11,254)	$ 42,566	$ 48,140	$ 29,471	$ 111,540	$ 120,177
Denominator:
Weighted average shares outstanding for basic earnings per share	87,911				87,649			87,849	87,591
Effect of dilutive instruments	945				210			600	214
Shares used in computing diluted earnings per common share	88,856				87,859			88,449	87,805
Earnings per share attributable to Acadia Healthcare Company, Inc. stockholders:
Basic	$ 0.42				$ 0.49			$ 1.27	$ 1.37
Diluted	$ 0.42				$ 0.48			$ 1.26	$ 1.37

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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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