Accounts Receivable, Net (Detail) - USD ($) $ in Thousands	Dec. 30, 2016	Jan. 01, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for contract losses and doubtful accounts	$ (3,417)	$ (2,792)
Total accounts receivable, net	87,409	88,577
Billed accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable	60,510	62,360
Unbilled accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable	$ 30,316	$ 29,009