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Allowance for Doubtful Accounts - Schedule of Allowance for Doubtful Accounts (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Receivables [Abstract]    
Balance at Beginning of Period $ 5,918 $ 5,137
Charged to Expense 13,351 12,812
Deductions (12,978) (11,766)
Balance at End of Period $ 6,291 $ 6,183