Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019
Income Statement [Abstract]
Revenue	$ 782,810				$ 760,617
Salaries, wages and benefits (including equity-based compensation expense of $4,979 and $6,101, respectively)	440,316				429,579
Professional fees	63,300				57,007
Supplies	31,971				29,957
Rents and leases	20,824				20,307
Other operating expenses	98,529				93,865
Depreciation and amortization	41,680				40,580
Interest expense, net	42,785				48,130
Transaction-related expenses	3,549				4,321
Total expenses	742,954				723,746
Income before income taxes	39,856				36,871
Provision for income taxes	5,789				7,360
Net income	34,067				29,511
Net income attributable to noncontrolling interests	(604)				(40)
Net income attributable to Acadia Healthcare Company, Inc.	$ 33,463	$ (11,254)	$ 42,566	$ 48,140	$ 29,471
Earnings per share attributable to Acadia Healthcare Company, Inc. stockholders:
Basic	$ 0.38				$ 0.34
Diluted	$ 0.38				$ 0.34
Weighted-average shares outstanding:
Basic	87,765				87,505
Diluted	87,971				87,694