Annual report pursuant to Section 13 and 15(d)

Accounts Receivable - Summary of Accounts Receivable (Detail)

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Accounts Receivable - Summary of Accounts Receivable (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Receivables [Abstract]    
Trade Accounts Receivable $ 93,823 $ 87,282
Unbilled Recoverable Costs and Accrued Profits 16,194 8,307
Total Receivables 110,017 95,589
Less Allowance for Doubtful Accounts (602) (312)
Accounts Receivable $ 109,415 $ 95,277