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Summary of Significant Accounting Policies - Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 02, 2016	Mar. 28, 2015
Schedule Of Computation Of Basic And Diluted Earnings Per Common Share [Line Items]
Net income	$ 3,932	$ 4,754
Weighted-average shares outstanding	29,004	29,653
Dilutive effect of employee stock options and restricted shares	470	577
Diluted weighted-average shares outstanding	29,474	30,230
Basic income per share	$ 0.14	$ 0.16
Diluted income per share	$ 0.13	$ 0.16
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	700	500

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