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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		6 Months Ended
	Jul. 02, 2016	Jun. 27, 2015	Jul. 02, 2016	Jun. 27, 2015
Schedule Of Computation Of Basic And Diluted Earnings Per Common Share [Line Items]
Net income	$ 4,814	$ 7,252	$ 8,746	$ 12,006
Weighted-average shares outstanding	27,360	29,785	28,198	29,719
Dilutive effect of employee stock options and restricted shares	476	483	519	564
Diluted weighted-average shares outstanding	27,836	30,268	28,717	30,283
Basic income per share	$ 0.18	$ 0.24	$ 0.31	$ 0.40
Diluted income per share	$ 0.17	$ 0.24	$ 0.30	$ 0.40
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	600	600	600	500

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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