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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
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Numerator:
Net income attributable to Acadia Healthcare Company, Inc.	$ 29,471	$ (331,637)	$ 46,232	$ 58,836	$ 50,819
Denominator:
Weighted average shares outstanding for basic earnings per share	87,505				87,121
Effect of dilutive instruments	189				173
Shares used in computing diluted earnings per common share	87,694				87,294
Earnings per share attributable to Acadia Healthcare Company, Inc. stockholders:
Basic	$ 0.34				$ 0.58
Diluted	$ 0.34				$ 0.58

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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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