Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 61,910	$ 10,479
Other comprehensive income:
Foreign currency translation loss		(4,260)
Gain on derivative instruments, net of tax of $0.1 million		19
U.K. Sale		375,606
Other comprehensive income		371,365
Comprehensive income	61,910	381,844
Comprehensive income attributable to noncontrolling interests	(1,073)	(762)
Comprehensive income attributable to Acadia Healthcare Company, Inc.	$ 60,837	$ 381,082