Net Income Per Common Share - Calculation of EPS and Reconciliation of Weighted Average Common Shares Used in Calculation of Basic and Diluted EPS (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2016	Jul. 04, 2015	Jul. 02, 2016	Jul. 04, 2015
Earnings Per Share [Abstract]
Net income	$ 7,350	$ 6,780	$ 8,829	$ 13,432
Weighted-average common shares - Basic	48,710	48,077	48,702	47,899
Add: Dilutive effect of stock compensation plans	1,763	2,206	1,763	2,256
Weighted-average common shares - Diluted	50,473	50,283	50,465	50,155
Net income per common share:
Basic	$ 0.15	$ 0.14	$ 0.18	$ 0.28
Diluted	$ 0.15	$ 0.13	$ 0.17	$ 0.27