Revenue - Schedule of Revenue Attributed to Each Category (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Revenue	$ 731,337	$ 651,719	$ 1,435,604	$ 1,268,372
U.S. Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	731,337	651,719	1,435,604	1,268,372
U.S. Facilities [Member] | Acute Inpatient Psychiatric Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	369,415	332,547	731,226	643,295
U.S. Facilities [Member] | Specialty Treatment Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	156,908	140,363	304,211	273,965
U.S. Facilities [Member] | Comprehensive Treatment Centers [Member]
Disaggregation of Revenue [Line Items]
Revenue	123,472	103,363	238,973	203,401
U.S. Facilities [Member] | Residential Treatment Centers [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 81,542	$ 75,446	$ 161,194	$ 147,711