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Accounts Receivable and Net Revenue - Schedule of Accounts Receivable, Net (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Receivables [Abstract]    
Gross accounts receivable $ 1,903,175 $ 1,790,034
Allowance for contractual adjustments and uncollectibles (1,380,349) (1,286,035)
Accounts receivable, net $ 522,826 $ 503,999