Reconciliation of Basic and Diluted Net Income Per Share Computations and Number of Dilutive Equity Awards Included in Dilutive Net Income Per Share Computation (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 04, 2017	Mar. 29, 2016
Earnings Per Share [Abstract]
Net income	$ 9,266	$ 11,644
Weighted-average shares outstanding - basic	21,932	24,278
Dilutive effect of equity awards	381	413
Weighted-average shares outstanding - diluted	22,313	24,691