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		9 Months Ended
	Oct. 03, 2015	Sep. 27, 2014	Oct. 03, 2015	Sep. 27, 2014
Accounting Policies [Abstract]
Net (loss) earnings	$ (9,515)	$ 2,933	$ (9,706)	$ 14,711
Weighted-average number of common shares outstanding
Basic weighted-average common shares outstanding	11,083	10,921	11,035	10,902
Dilutive potential common shares	0	229	0	300
Diluted weighted-average common shares outstanding	11,083	11,150	11,035	11,202
(Loss) earnings per share
Basic (in dollars per share)	$ (0.86)	$ 0.27	$ (0.88)	$ 1.35
Diluted (in dollars per share)	$ (0.86)	$ 0.26	$ (0.88)	$ 1.31