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Revenue - Schedule of U.K. Revenue and Percentage Generated by Each Payor Type (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Health Care Organization, Receivable and Revenue Disclosures [Line Items]        
Revenue $ 833,304 $ 777,251 $ 2,366,425 $ 2,327,230
U.K. Facilities [Member]        
Health Care Organization, Receivable and Revenue Disclosures [Line Items]        
Revenue $ 285,343 $ 267,868 $ 817,772 $ 820,074
Revenue, Percentage 100.00% 100.00% 100.00% 100.00%
U.K. Facilities [Member] | U.K. Public Funded Sources [Member]        
Health Care Organization, Receivable and Revenue Disclosures [Line Items]        
Revenue $ 258,508 $ 242,747 $ 740,329 $ 740,492
Revenue, Percentage 90.60% 90.60% 90.50% 90.30%
U.K. Facilities [Member] | Self-Pay [Member]        
Health Care Organization, Receivable and Revenue Disclosures [Line Items]        
Revenue $ 26,147 $ 24,430 $ 75,618 $ 77,895
Revenue, Percentage 9.20% 9.10% 9.30% 9.50%
U.K. Facilities [Member] | Other [Member]        
Health Care Organization, Receivable and Revenue Disclosures [Line Items]        
Revenue $ 688 $ 691 $ 1,825 $ 1,687
Revenue, Percentage 0.20% 0.30% 0.20% 0.20%