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		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Earnings Per Share [Abstract]
Net income	$ 15,106	$ 13,571	$ 40,408	$ 43,459
Weighted-average common shares - Basic	58,433	51,682	58,320	50,619
Add: Dilutive effect of stock compensation plans	709	1,386	872	1,759
Weighted-average common shares - Diluted	59,142	53,068	59,192	52,378
Net income per common share:
Basic	$ 0.26	$ 0.26	$ 0.69	$ 0.86
Diluted	$ 0.26	$ 0.26	$ 0.68	$ 0.83