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								12 Months Ended
	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 31, 2015	Oct. 03, 2015	Jul. 04, 2015	Apr. 04, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Net Income (Loss)	$ 2,836	$ 5,014	$ 3,861	$ 13,550	$ (65,173)	$ (9,515)	$ 1,782	$ (1,973)	$ 25,261	$ (74,879)	$ 19,867
Weighted-average number of common shares outstanding
Basic weighted-average common shares outstanding (in shares)									11,151	11,047	10,897
Dilutive potential common shares (in shares)									148	0	229
Diluted weighted-average common shares outstanding (in shares)									11,299	11,047	11,126
Earnings (Loss) Per Share
Basic (in dollars per share)	$ 0.25	$ 0.45	$ 0.35	$ 1.22	$ (5.88)	$ (0.86)	$ 0.16	$ (0.18)	$ 2.27	$ (6.78)	$ 1.82
Diluted (in dollars per share)	$ 0.25	$ 0.44	$ 0.34	$ 1.21	$ (5.88)	$ (0.86)	$ 0.16	$ (0.18)	$ 2.24	$ (6.78)	$ 1.79