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. 02, 2016	Apr. 04, 2015
Accounting Policies [Abstract]
Net earnings (loss)	$ 13,550	$ (1,973)
Weighted-average number of common shares outstanding
Basic weighted-average common shares outstanding	11,100	10,964
Dilutive potential common shares	140	0
Diluted weighted-average common shares outstanding	11,240	10,964
Earnings (loss) per share
Basic (in dollars per share)	$ 1.22	$ (0.18)
Diluted (in dollars per share)	$ 1.21	$ (0.18)