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Accounts Receivable - Schedule of Accounts Receivable, Net (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Receivables [Abstract]    
Gross accounts receivable $ 1,823,271 $ 1,719,642
Allowance for contractual adjustments and uncollectibles (1,303,259) (1,224,366)
Accounts receivable, net $ 520,012 $ 495,276