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Allowance for Doubtful Accounts - Schedule of Allowance for Doubtful Accounts (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Receivables [Abstract]    
Balance at Beginning of Period $ 5,907 $ 5,918
Charged to Expense 8,669 13,351
Deductions (8,483) (12,978)
Transfers (6,093)  
Balance at End of Period $ 0 $ 6,291