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Income Taxes - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 29, 2013
Sep. 23, 2012
Sep. 29, 2013
Sep. 23, 2012
Income Tax Disclosure [Abstract]        
Income tax expense $ 905 $ 84 $ 2,792 $ 765
Pre-tax income $ 3,079 $ 2,637 $ 7,757 $ 6,301
Effective tax rate     36.00% 12.10%