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Revenue - Schedule of U.K. Revenue and Percentage Generated by Each Payor Type (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Health Care Organization, Receivable and Revenue Disclosures [Line Items]        
Revenue $ 750,311 $ 789,362 $ 1,533,121 $ 1,549,979
U.K. Facilities [Member]        
Health Care Organization, Receivable and Revenue Disclosures [Line Items]        
Revenue $ 258,836 $ 279,549 $ 532,429 $ 552,206
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 $ 235,685 $ 252,332 $ 481,821 $ 497,745
Revenue, Percentage 91.10% 90.30% 90.50% 90.10%
U.K. Facilities [Member] | Self-Pay [Member]        
Health Care Organization, Receivable and Revenue Disclosures [Line Items]        
Revenue $ 22,556 $ 26,651 $ 49,471 $ 53,465
Revenue, Percentage 8.70% 9.50% 9.30% 9.70%
U.K. Facilities [Member] | Other [Member]        
Health Care Organization, Receivable and Revenue Disclosures [Line Items]        
Revenue $ 595 $ 566 $ 1,137 $ 996
Revenue, Percentage 0.20% 0.20% 0.20% 0.20%