Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Revenue before provision for doubtful accounts	$ 767,054	$ 461,798	$ 1,394,237	$ 835,956
Provision for doubtful accounts	(10,506)	(8,138)	(20,876)	(16,513)
Revenue	756,548	453,660	1,373,361	819,443
Salaries, wages and benefits (including equity-based compensation expense of $6,888, $5,355, $13,844 and $9,249, respectively)	408,287	243,302	749,315	449,173
Professional fees	50,292	30,029	90,283	52,456
Supplies	31,209	20,542	57,894	36,796
Rents and leases	20,467	8,211	35,273	14,097
Other operating expenses	80,955	51,128	151,202	91,655
Depreciation and amortization	36,752	14,926	64,727	28,030
Interest expense, net	48,758	28,049	86,472	50,195
(Gain) loss on foreign currency derivatives	(98)	961	(508)	908
Transaction-related expenses	6,074	7,157	32,372	25,573
Total expenses	682,696	404,305	1,267,030	748,883
Income from continuing operations before income taxes	73,852	49,355	106,331	70,560
Provision for income taxes	18,261	15,512	25,371	22,125
Income (loss) from continuing operations	55,591	33,843	80,960	48,435
Income from discontinued operations, net of income taxes		1		3
Net income	55,591	33,844	80,960	48,438
Net loss attributable to noncontrolling interests	854		1,173
Net income attributable to Acadia Healthcare Company, Inc.	$ 56,445	$ 33,844	$ 82,133	$ 48,438
Basic earnings attributable to Acadia Healthcare Company, Inc. stockholders:
Income from continuing operations	$ 0.65	$ 0.50	$ 0.97	$ 0.74
Income from discontinued operations	0	0	0	0
Net income	0.65	0.50	0.97	0.74
Diluted earnings attributable to Acadia Healthcare Company, Inc. stockholders:
Income from continuing operations	0.65	0.49	0.97	0.74
Income from discontinued operations	0	0	0	0
Net income	$ 0.65	$ 0.49	$ 0.97	$ 0.74
Weighted-average shares outstanding:
Basic	86,553	68,296	84,748	65,429
Diluted	86,876	68,735	85,052	65,782