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Revenue - Schedule of Revenue Attributed to Each Category (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Disaggregation of Revenue [Line Items]        
Revenue $ 750,334 $ 666,732 $ 2,185,938 $ 1,935,104
U.S. Facilities [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 750,334 666,732 2,185,938 1,935,104
U.S. Facilities [Member] | Acute Inpatient Psychiatric Facilities [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 382,406 340,929 1,113,632 984,224
U.S. Facilities [Member] | Specialty Treatment Facilities [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 158,705 145,799 462,916 419,764
U.S. Facilities [Member] | Comprehensive Treatment Centers [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 129,645 106,679 368,618 310,080
U.S. Facilities [Member] | Residential Treatment Centers [Member]        
Disaggregation of Revenue [Line Items]        
Revenue $ 79,578 $ 73,325 $ 240,772 $ 221,036