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Allowance for Doubtful Accounts - Schedule of Allowance for Doubtful Accounts (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Receivables [Abstract]    
Balance at Beginning of Period $ 5,918 $ 5,137
Charged to Expense 4,383 4,520
Deductions (3,382) (3,090)
Balance at End of Period $ 6,919 $ 6,567