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. 25, 2016	Jun. 27, 2015	Jun. 25, 2016	Jun. 27, 2015
Numerator
Net income	$ 25,982	$ 23,143	$ 50,653	$ 44,482
Denominator:
Weighted average basic shares outstanding	34,546	35,548	34,615	35,545
Effect of stock-based compensation awards	80	66	54	84
Weighted average diluted shares outstanding	34,626	35,614	34,669	35,629
Earnings Per Share:
Basic	$ 0.75	$ 0.65	$ 1.46	$ 1.25
Diluted	$ 0.75	$ 0.65	$ 1.46	$ 1.25