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Accounts Receivable - Schedule of Accounts Receivable, Net (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Receivables [Abstract]    
Gross accounts receivable $ 1,659,304 $ 1,574,038
Allowance for contractual adjustments and uncollectibles (1,172,347) (1,129,301)
Accounts receivable, net $ 486,957 $ 444,737