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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, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Net income attributable to Acadia Healthcare Company, Inc.	$ 42,566	$ 48,140	$ 29,471	$ (331,637)	$ 46,232	$ 58,836	$ 50,819	$ 120,177	$ 155,887
Denominator:
Weighted average shares outstanding for basic earnings per share	87,649				87,344			87,591	87,233
Effect of dilutive instruments	210				193			214	153
Shares used in computing diluted earnings per common share	87,859				87,537			87,805	87,386
Earnings per share attributable to Acadia Healthcare Company, Inc. stockholders:
Basic	$ 0.49				$ 0.53			$ 1.37	$ 1.79
Diluted	$ 0.48				$ 0.53			$ 1.37	$ 1.78

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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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