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Allowance for Doubtful Accounts - Schedule of Allowance for Doubtful Accounts (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Receivables [Abstract]    
Balance at Beginning of Period $ 5,137 $ 6,472
Charged to Expense 7,963 7,412
Deductions (7,525) (7,953)
Balance at End of Period $ 5,575 $ 5,931