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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						6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator:
Net income attributable to Acadia Healthcare Company, Inc.	$ 41,079	$ 33,463	$ (11,254)	$ 42,566	$ 48,140	$ 29,471	$ 74,542	$ 77,611
Denominator:
Weighted average shares outstanding for basic earnings per share	87,872				87,618		87,818	87,562
Effect of dilutive instruments	736				219		410	208
Shares used in computing diluted earnings per common share	88,608				87,837		88,228	87,770
Earnings per share attributable to Acadia Healthcare Company, Inc. stockholders:
Basic	$ 0.47				$ 0.55		$ 0.85	$ 0.89
Diluted	$ 0.46				$ 0.55		$ 0.84	$ 0.88

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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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