Annual report pursuant to Section 13 and 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
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Trade receivables $ 54,700 $ 42,100 $ 23,900
Allowance for doubtful accounts (1,400) (1,000) (100)
Accounts receivable, net of allowance for doubtful accounts $ 53,347 $ 41,132 $ 23,779