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Accounts Receivable and Net Revenue - Schedule of Accounts Receivable, Net (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Receivables [Abstract]    
Gross accounts receivable $ 1,923,585 $ 1,993,395
Allowance for contractual adjustments and uncollectibles (1,428,886) (1,486,672)
Accounts receivable, net $ 494,699 $ 506,723