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Accounts Receivable, Net (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Allowance for contract losses and doubtful accounts $ (3,333) $ (3,417)
Total accounts receivable, net 107,444 87,409
Billed accounts receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts Receivable 72,915 60,510
Unbilled accounts receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts Receivable $ 37,862 $ 30,316