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Summary of Notes and Accounts Receivable (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounts and Other Receivables [Line Items]        
Notes receivable   $ 16    
Trade accounts receivable $ 75,946 61,293    
Trade Accounts And Notes Receivable Gross Current 75,946 61,309    
Allowance for doubtful accounts (723) (775) $ (1,167) $ (1,275)
Allowance for sales returns and discounts (1,624) (1,555) $ (1,427) $ (1,059)
Notes and accounts receivable, net $ 73,599 $ 58,979