Summary of Significant Accounting Policies - Weighted Average Number of Shares Outstanding Used to Compute Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 01, 2017	Apr. 02, 2016
Accounting Policies [Abstract]
Net income	$ 2,115	$ 13,550
Weighted-average number of common shares outstanding
Basic weighted-average common shares outstanding (in shares)	11,208	11,100
Dilutive potential common shares (in shares)	287	140
Diluted weighted-average common shares outstanding (in shares)	11,495	11,240
Earnings per share
Basic (in dollars per share)	$ 0.19	$ 1.22
Diluted (in dollars per share)	$ 0.18	$ 1.21