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Computation of Basic and Diluted Net Income Per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 27, 2013
Sep. 28, 2012
Sep. 27, 2013
Sep. 28, 2012
Computation Of Earnings Per Share Line Items        
Net income $ 4,160 $ 3,816 $ 12,154 $ 10,907
Net income per share:        
Basic $ 0.20 $ 0.18 $ 0.58 $ 0.53
Diluted $ 0.20 $ 0.18 $ 0.58 $ 0.52
Weighted average common shares outstanding:        
Basic 20,928,148 20,662,956 20,819,209 20,571,848
Diluted 21,145,159 20,980,019 21,052,560 20,911,337