Revenue - Schedule of Revenue Attributed to Each Category (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 651,719	$ 582,156	$ 1,268,372	$ 1,133,355
U.S. Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	651,719	582,156	1,268,372	1,133,355
U.S. Facilities [Member] | Acute Inpatient Psychiatric Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	332,547	281,190	643,295	548,549
U.S. Facilities [Member] | Specialty Treatment Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	243,726	227,042	477,366	438,799
U.S. Facilities [Member] | Residential Treatment Centers [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 75,446	71,722	$ 147,711	140,371
U.S. Facilities [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue		$ 2,202		$ 5,636