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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 25, 2016
Sep. 27, 2015
Sep. 25, 2016
Sep. 27, 2015
Income Tax Disclosure [Abstract]        
Income tax expense $ 960 $ 866 $ 3,732 $ 2,780
Income before income taxes $ 2,809 $ 2,323 $ 10,141 $ 7,231
Effective tax rate 34.20% 37.30% 36.80% 38.40%