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Allowance for Doubtful Accounts - Schedule of Allowance for Doubtful Accounts (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Receivables [Abstract]    
Balance at Beginning of Period $ 5,918 $ 5,137
Charged to Expense 7,830 7,963
Deductions (8,179) (7,525)
Balance at End of Period $ 5,569 $ 5,575