Quarterly report pursuant to Section 13 or 15(d)

Accounts Receivable, Net of Allowance for Doubtful Accounts (Detail)

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Accounts Receivable, Net of Allowance for Doubtful Accounts (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade receivables $ 51,200 $ 54,700
Allowance for doubtful accounts (500) (1,400)
Accounts receivable, net of allowance for doubtful accounts $ 50,664 $ 53,347