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Revenue - Schedule of U.K. Revenue and Percentage Generated by Each Payor Type (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Health Care Organization, Receivable and Revenue Disclosures [Line Items]    
Revenue $ 760,617 $ 742,241
U.K. Facilities [Member]    
Health Care Organization, Receivable and Revenue Disclosures [Line Items]    
Revenue $ 272,657 $ 279,836
Revenue, Percentage 100.00% 100.00%
U.K. Facilities [Member] | U.K. Public Funded Sources [Member]    
Health Care Organization, Receivable and Revenue Disclosures [Line Items]    
Revenue $ 245,413 $ 253,294
Revenue, Percentage 90.00% 90.50%
U.K. Facilities [Member] | Self-Pay [Member]    
Health Care Organization, Receivable and Revenue Disclosures [Line Items]    
Revenue $ 26,814 $ 25,068
Revenue, Percentage 9.80% 9.00%
U.K. Facilities [Member] | Other [Member]    
Health Care Organization, Receivable and Revenue Disclosures [Line Items]    
Revenue $ 430 $ 1,474
Revenue, Percentage 0.20% 0.50%