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Revenue - Schedule of Revenue Attributed to Each Category (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disaggregation of Revenue [Line Items]    
Revenue $ 551,199 $ 509,217
U.S. Facilities [Member]    
Disaggregation of Revenue [Line Items]    
Revenue 551,199 509,217
U.S. Facilities [Member] | Acute Inpatient Psychiatric Facilities [Member]    
Disaggregation of Revenue [Line Items]    
Revenue 267,359 239,414
U.S. Facilities [Member] | Specialty Treatment Facilities [Member]    
Disaggregation of Revenue [Line Items]    
Revenue 211,757 193,611
U.S. Facilities [Member] | Residential Treatment Centers [Member]    
Disaggregation of Revenue [Line Items]    
Revenue 68,649 70,434
U.S. Facilities [Member] | Outpatient Community-Based Facilities [Member]    
Disaggregation of Revenue [Line Items]    
Revenue $ 3,434 $ 5,758