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. 01, 2016	Oct. 03, 2015	Oct. 01, 2016	Oct. 03, 2015
Accounting Policies [Abstract]
Net income (loss)	$ 5,014	$ (9,515)	$ 22,425	$ (9,706)
Weighted-average number of common shares outstanding
Basic weighted-average common shares outstanding (in shares)	11,169	11,083	11,141	11,035
Dilutive potential common shares (in shares)	141	0	120	0
Diluted weighted-average common shares outstanding (in shares)	11,310	11,083	11,261	11,035
Earnings (loss) per share
Basic (in dollars per share)	$ 0.45	$ (0.86)	$ 2.01	$ (0.88)
Diluted (in dollars per share)	$ 0.44	$ (0.86)	$ 1.99	$ (0.88)