Revenue - Schedule of Revenue Attributed to Each Category (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Revenue	$ 815,634	$ 750,334	$ 2,379,725	$ 2,185,938
U.S. Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	815,634	750,334	2,379,725	2,185,938
U.S. Facilities [Member] | Acute Inpatient Psychiatric Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	439,788	382,406	1,269,593	1,113,632
U.S. Facilities [Member] | Specialty Treatment Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	155,787	158,705	450,668	462,916
U.S. Facilities [Member] | Comprehensive Treatment Centers [Member]
Disaggregation of Revenue [Line Items]
Revenue	134,174	129,645	400,984	368,618
U.S. Facilities [Member] | Residential Treatment Centers [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 85,885	$ 79,578	$ 258,480	$ 240,772