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Accounts receivable, net (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 27, 2013
Dec. 28, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Allowance for doubtful accounts $ (2,772) $ (2,666)
Total accounts receivable, net 82,177 85,361
Billed accounts receivable
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable 52,733 54,653
Unbilled accounts receivable
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable $ 32,216 $ 33,374