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		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Numerator
Net income	$ 34,017	$ 27,008	$ 99,003	$ 84,632
Denominator:
Weighted average basic shares outstanding	32,985	33,822	33,177	34,111
Effect of stock-based compensation awards	110	87	90	91
Weighted average diluted shares outstanding	33,095	33,909	33,267	34,202
Earnings Per Share:
Basic	$ 1.03	$ 0.80	$ 2.98	$ 2.48
Diluted	$ 1.03	$ 0.80	$ 2.98	$ 2.47