Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Statement [Abstract]
Revenue	$ 815,634	$ 750,334	$ 2,379,725	$ 2,185,938
Salaries, wages and benefits (including equity-based compensation expense of $9,467, $8,163, $27,014 and $23,140, respectively)	428,147	394,150	1,265,427	1,171,960
Professional fees	48,498	45,540	142,236	130,468
Supplies	29,623	27,147	84,153	79,312
Rents and leases	12,389	11,731	36,141	34,880
Other operating expenses	112,137	104,048	322,900	290,798
Income from provider relief fund		(4,442)		(4,442)
Depreciation and amortization	37,641	33,388	110,054	96,969
Interest expense, net	29,924	20,742	86,297	61,651
Legal settlements expense		394,181		394,181
Loss on impairment	10,459		11,459	8,694
Transaction, legal and other costs	8,249	11,247	17,187	26,792
Total expenses	717,067	1,037,732	2,075,854	2,291,263
Income (loss) before income taxes	98,567	(287,398)	303,871	(105,325)
Provision for (benefit from) income taxes	27,199	(71,873)	72,916	(29,907)
Net income (loss)	71,368	(215,525)	230,955	(75,418)
Net income attributable to noncontrolling interests	(3,236)	(2,185)	(7,958)	(3,978)
Net income (loss) attributable to Acadia Healthcare Company, Inc.	$ 68,132	$ (217,710)	$ 222,997	$ (79,396)
Earnings (loss) per share attributable to Acadia Healthcare Company, Inc. stockholders:
Basic	$ 0.74	$ (2.39)	$ 2.44	$ (0.87)
Diluted	$ 0.74	$ (2.39)	$ 2.42	$ (0.87)
Weighted-average shares outstanding:
Basic	91,720	91,168	91,571	90,852
Diluted	92,188	91,168	92,119	90,852