Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Income Statement [Abstract]
Revenue	$ 869,232	$ 796,040	$ 1,639,737	$ 1,564,091
Salaries, wages and benefits (including equity-based compensation expense of $10,549, $8,869, $19,226 and $17,547, respectively)	452,417	419,757	897,688	837,280
Professional fees	49,961	48,050	95,668	93,738
Supplies	28,532	27,878	56,874	54,530
Rents and leases	12,610	11,889	24,266	23,752
Other operating expenses	134,414	109,690	248,416	210,763
Depreciation and amortization	48,995	36,066	96,027	72,413
Interest expense, net	35,138	29,159	64,320	56,373
Debt extinguishment costs			1,269
Legal settlements expense			3,504
Loss on impairment	1,452	1,000	1,452	1,000
Gain on sale of property	(8,715)		(8,715)
Transaction, legal and other costs	64,425	6,091	95,497	8,938
Total expenses	819,229	689,580	1,576,266	1,358,787
Income before income taxes	50,003	106,460	63,471	205,304
Provision for income taxes	12,067	25,643	16,471	45,717
Net income	37,936	80,817	47,000	159,587
Net income attributable to noncontrolling interests	(7,809)	(2,335)	(8,499)	(4,722)
Net income attributable to Acadia Healthcare Company, Inc.	$ 30,127	$ 78,482	$ 38,501	$ 154,865
Earnings per share attributable to Acadia Healthcare Company, Inc. stockholders:
Basic	$ 0.33	$ 0.86	$ 0.42	$ 1.69
Diluted	$ 0.33	$ 0.85	$ 0.42	$ 1.68
Weighted-average shares outstanding:
Basic	90,328	91,628	90,987	91,495
Diluted	90,435	92,043	91,400	92,051