Earnings Per Share - Schedule of Computation of Basic Earnings per Share and Diluted Earnings per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jun. 25, 2016	Jul. 01, 2017	Jun. 25, 2016
Numerator
Net income	$ 28,437	$ 25,982	$ 57,624	$ 50,653
Denominator:
Weighted average basic shares outstanding	34,128	34,546	34,256	34,615
Effect of stock-based compensation awards	97	80	94	54
Weighted average diluted shares outstanding	34,225	34,626	34,350	34,669
Earnings Per Share:
Basic	$ 0.83	$ 0.75	$ 1.68	$ 1.46
Diluted	$ 0.83	$ 0.75	$ 1.68	$ 1.46