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Revenue - Schedule of Revenue and Percentage Generated by Each Payor Type (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Health Care Organization, Receivable and Revenue Disclosures [Line Items]        
Revenue $ 587,559 $ 547,961 $ 1,720,914 $ 1,548,653
U.S. Facilities [Member]        
Health Care Organization, Receivable and Revenue Disclosures [Line Items]        
Revenue $ 587,559 $ 547,961 $ 1,720,914 $ 1,548,653
Revenue, Percentage 100.00% 100.00% 100.00% 100.00%
U.S. Facilities [Member] | Commercial [Member]        
Health Care Organization, Receivable and Revenue Disclosures [Line Items]        
Revenue $ 170,427 $ 156,741 $ 511,975 $ 439,911
Revenue, Percentage 29.00% 28.60% 29.80% 28.40%
U.S. Facilities [Member] | Medicare [Member]        
Health Care Organization, Receivable and Revenue Disclosures [Line Items]        
Revenue $ 97,529 $ 96,536 $ 274,208 $ 244,721
Revenue, Percentage 16.60% 17.60% 15.90% 15.90%
U.S. Facilities [Member] | Medicaid [Member]        
Health Care Organization, Receivable and Revenue Disclosures [Line Items]        
Revenue $ 288,092 $ 261,341 $ 845,128 $ 767,075
Revenue, Percentage 49.00% 47.70% 49.10% 49.40%
U.S. Facilities [Member] | Self-Pay [Member]        
Health Care Organization, Receivable and Revenue Disclosures [Line Items]        
Revenue $ 25,998 $ 26,060 $ 71,875 $ 75,570
Revenue, Percentage 4.40% 4.80% 4.20% 4.90%
U.S. Facilities [Member] | Other [Member]        
Health Care Organization, Receivable and Revenue Disclosures [Line Items]        
Revenue $ 5,513 $ 7,283 $ 17,728 $ 21,376
Revenue, Percentage 1.00% 1.30% 1.00% 1.40%