Annual report pursuant to Section 13 and 15(d)

Accounts Receivable - Summary of Accounts Receivable (Detail)

v3.8.0.1
Accounts Receivable - Summary of Accounts Receivable (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Receivables [Abstract]    
Trade Accounts Receivable $ 114,461 $ 93,823
Unbilled Recoverable Costs and Accrued Profits 19,132 16,194
Total Receivables 133,593 110,017
Less Allowance for Doubtful Accounts (960) (602)
Accounts Receivable $ 132,633 $ 109,415