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Revenue - Schedule of Revenue and Percentage Generated by Each Payor Type (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Health Care Organization, Receivable and Revenue Disclosures [Line Items]    
Revenue $ 551,199 $ 509,217
U.S. Facilities [Member]    
Health Care Organization, Receivable and Revenue Disclosures [Line Items]    
Revenue $ 551,199 $ 509,217
Revenue, Percentage 100.00% 100.00%
U.S. Facilities [Member] | Commercial [Member]    
Health Care Organization, Receivable and Revenue Disclosures [Line Items]    
Revenue $ 162,702 $ 143,142
Revenue, Percentage 29.50% 28.10%
U.S. Facilities [Member] | Medicare [Member]    
Health Care Organization, Receivable and Revenue Disclosures [Line Items]    
Revenue $ 86,185 $ 72,271
Revenue, Percentage 15.60% 14.20%
U.S. Facilities [Member] | Medicaid [Member]    
Health Care Organization, Receivable and Revenue Disclosures [Line Items]    
Revenue $ 274,620 $ 260,044
Revenue, Percentage 49.80% 51.10%
U.S. Facilities [Member] | Self-Pay [Member]    
Health Care Organization, Receivable and Revenue Disclosures [Line Items]    
Revenue $ 22,443 $ 27,034
Revenue, Percentage 4.10% 5.30%
U.S. Facilities [Member] | Other [Member]    
Health Care Organization, Receivable and Revenue Disclosures [Line Items]    
Revenue $ 5,249 $ 6,726
Revenue, Percentage 1.00% 1.30%