Accounts Receivable, Net (Detail) (USD $) In Thousands, unless otherwise specified	Jan. 03, 2014	Dec. 28, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for contract losses and doubtful accounts	$ (2,771)	$ (2,666)
Total accounts receivable, net	76,980	85,361
Billed accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	52,674	54,653
Unbilled accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 27,077	$ 33,374