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
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Numerator:
Net income	$ 23,143	$ 23,244	$ 44,482	$ 46,795
Denominator:
Weighted average basic shares outstanding	35,548	36,315	35,545	36,344
Effect of stock-based compensation awards	66	156	84	170
Weighted average diluted shares outstanding	35,614	36,471	35,629	36,514
Earnings Per Share:
Basic	$ 0.65	$ 0.64	$ 1.25	$ 1.29
Diluted	$ 0.65	$ 0.64	$ 1.25	$ 1.28