Condensed Consolidated Statements of Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]
Balance at Dec. 31, 2021	$ 2,517,489	$ 890	$ 2,636,350	$ (119,751)
Balance, shares at Dec. 31, 2021		89,028,000
Common stock issued under stock incentive plans	3,749	$ 7	3,742
Common stock issued under stock incentive plans, shares		633,000
Repurchase of shares for payroll tax withholding, net of proceeds from stock option exercises	(15,490)		(15,490)
Equity-based compensation expense	7,925		7,925
Net income attributable to Acadia Healthcare Company, Inc.	60,837			60,837
Balance at Mar. 31, 2022	2,574,510	$ 897	2,632,527	(58,914)
Balance, shares at Mar. 31, 2022		89,661,000
Balance at Dec. 31, 2021	$ 2,517,489	$ 890	2,636,350	(119,751)
Balance, shares at Dec. 31, 2021		89,028,000
Common stock issued under stock incentive plans, shares	285,577
Balance at Dec. 31, 2022	$ 2,812,727	$ 899	2,658,440	153,388
Balance, shares at Dec. 31, 2022	89,913,659	89,914,000
Balance at Mar. 31, 2022	$ 2,574,510	$ 897	2,632,527	(58,914)
Balance, shares at Mar. 31, 2022		89,661,000
Common stock issued under stock incentive plans	3,148	$ 1	3,147
Common stock issued under stock incentive plans, shares		113,000
Repurchase of shares for payroll tax withholding, net of proceeds from stock option exercises	(1,275)		(1,275)
Equity-based compensation expense	6,580		6,580
Net income attributable to Acadia Healthcare Company, Inc.	80,079			80,079
Balance at Jun. 30, 2022	2,663,042	$ 898	2,640,979	21,165
Balance, shares at Jun. 30, 2022		89,774,000
Common stock issued under stock incentive plans	3,067	$ 1	3,066
Common stock issued under stock incentive plans, shares		101,000
Repurchase of shares for payroll tax withholding, net of proceeds from stock option exercises	(740)		(740)
Equity-based compensation expense	7,240		7,240
Net income attributable to Acadia Healthcare Company, Inc.	71,099			71,099
Balance at Sep. 30, 2022	2,743,708	$ 899	2,650,545	92,264
Balance, shares at Sep. 30, 2022		89,875,000
Common stock issued under stock incentive plans	1,649		1,649
Common stock issued under stock incentive plans, shares		39,000
Repurchase of shares for payroll tax withholding, net of proceeds from stock option exercises	(287)		(287)
Equity-based compensation expense	7,890		7,890
Other	(1,357)		(1,357)
Net income attributable to Acadia Healthcare Company, Inc.	61,124			61,124
Balance at Dec. 31, 2022	$ 2,812,727	$ 899	2,658,440	153,388
Balance, shares at Dec. 31, 2022	89,913,659	89,914,000
Common stock issued under stock incentive plans	$ 1,203	$ 11	1,192
Common stock issued under stock incentive plans, shares	32,491	1,039,000
Repurchase of shares for payroll tax withholding, net of proceeds from stock option exercises	$ (48,874)		(48,874)
Equity-based compensation expense	7,629		7,629
Other	902		902
Net income attributable to Acadia Healthcare Company, Inc.	66,015			66,015
Balance at Mar. 31, 2023	$ 2,839,602	$ 910	$ 2,619,289	$ 219,403
Balance, shares at Mar. 31, 2023	90,953,107	90,953,000