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Revenue - Schedule of Revenue and Percentage Generated by Each Payor Type (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Health Care Organization, Receivable and Revenue Disclosures [Line Items]        
Revenue $ 582,156 $ 491,475 $ 1,133,355 $ 1,000,692
U.S. Facilities [Member]        
Health Care Organization, Receivable and Revenue Disclosures [Line Items]        
Revenue $ 582,156 $ 491,475 $ 1,133,355 $ 1,000,692
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 $ 178,846 $ 140,028 $ 341,548 $ 283,170
Revenue, Percentage 30.70% 28.50% 30.10% 28.30%
U.S. Facilities [Member] | Medicare [Member]        
Health Care Organization, Receivable and Revenue Disclosures [Line Items]        
Revenue $ 90,494 $ 75,914 $ 176,679 $ 148,185
Revenue, Percentage 15.50% 15.40% 15.60% 14.80%
U.S. Facilities [Member] | Medicaid [Member]        
Health Care Organization, Receivable and Revenue Disclosures [Line Items]        
Revenue $ 282,416 $ 245,690 $ 557,036 $ 505,734
Revenue, Percentage 48.50% 50.00% 49.10% 50.50%
U.S. Facilities [Member] | Self-Pay [Member]        
Health Care Organization, Receivable and Revenue Disclosures [Line Items]        
Revenue $ 23,434 $ 22,476 $ 45,877 $ 49,510
Revenue, Percentage 4.00% 4.60% 4.00% 5.00%
U.S. Facilities [Member] | Other [Member]        
Health Care Organization, Receivable and Revenue Disclosures [Line Items]        
Revenue $ 6,966 $ 7,367 $ 12,215 $ 14,093
Revenue, Percentage 1.30% 1.50% 1.20% 1.40%