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Revenue - Schedule of U.S. Revenue Attributed to Each Category (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]                      
Revenue $ 541,276 $ 547,961 $ 491,475 $ 509,217 $ 501,225 $ 509,383 $ 509,813 $ 487,960 $ 2,089,929 $ 2,008,381 $ 1,904,695
U.S. Facilities [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 2,089,929 2,008,381 1,904,695
U.S. Facilities [Member] | Acute Inpatient Psychiatric Facilities [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 984,609 912,097 814,124
U.S. Facilities [Member] | Specialty Treatment Facilities [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 802,022 788,232 761,017
U.S. Facilities [Member] | Residential Treatment Centers [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 281,158 286,959 293,053
U.S. Facilities [Member] | Outpatient Community-Based Facilities [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue                 $ 22,140 $ 21,093 $ 36,501