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Revenue - Schedule of Revenue and Percentage Generated by Each Payor Type in U.S Facilities (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Health Care Organization, Receivable and Revenue Disclosures [Line Items]      
Revenue $ 2,314,394 $ 2,089,929 $ 2,008,381
U.S. Facilities [Member]      
Health Care Organization, Receivable and Revenue Disclosures [Line Items]      
Revenue $ 2,314,394 $ 2,089,929 $ 2,008,381
Revenue, Percentage 100.00% 100.00% 100.00%
U.S. Facilities [Member] | Commercial [Member]      
Health Care Organization, Receivable and Revenue Disclosures [Line Items]      
Revenue $ 684,292 $ 596,698 $ 565,350
Revenue, Percentage 29.60% 28.50% 28.20%
U.S. Facilities [Member] | Medicare [Member]      
Health Care Organization, Receivable and Revenue Disclosures [Line Items]      
Revenue $ 364,598 $ 330,070 $ 294,691
Revenue, Percentage 15.80% 15.80% 14.70%
U.S. Facilities [Member] | Medicaid [Member]      
Health Care Organization, Receivable and Revenue Disclosures [Line Items]      
Revenue $ 1,147,884 $ 1,037,852 $ 1,007,102
Revenue, Percentage 49.60% 49.70% 50.10%
U.S. Facilities [Member] | Self-Pay [Member]      
Health Care Organization, Receivable and Revenue Disclosures [Line Items]      
Revenue $ 93,425 $ 98,302 $ 118,716
Revenue, Percentage 4.00% 4.70% 5.90%
U.S. Facilities [Member] | Other [Member]      
Health Care Organization, Receivable and Revenue Disclosures [Line Items]      
Revenue $ 24,195 $ 27,007 $ 22,522
Revenue, Percentage 1.00% 1.30% 1.10%