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Allowance for Doubtful Accounts - Schedule of Allowance for Doubtful Accounts (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Receivables [Abstract]    
Balance at Beginning of Period $ 5,137 $ 6,472
Charged to Expense 4,520 3,968
Deductions (3,090) (3,492)
Balance at End of Period $ 6,567 $ 6,948