Summary of Significant Accounting Policies - Weighted Average Number of Shares Outstanding Used to Compute Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 31, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounting Policies [Abstract]
Net earnings (loss) (a)	$ (4,504)	$ 4,636	$ 5,504	$ 3,707	$ 3,435	$ 5,105	$ 5,507	$ 2,390	$ 9,343	$ 16,437	$ (47,583)
Weighted-average number of common shares outstanding
Basic weighted-average common shares outstanding (b)									10,695	10,580	10,536
Dilutive potential common shares									157	48	0
Diluted weighted-average common shares outstanding (c)									10,852	10,628	10,536
Earnings (Loss) Per Share
Basic (in dollars per share)	$ (0.42)	$ 0.43	$ 0.52	$ 0.35	$ 0.32	$ 0.48	$ 0.52	$ 0.23	$ 0.87	$ 1.55	$ (4.52)
Diluted (in dollars per share)	$ (0.42)	$ 0.42	$ 0.51	$ 0.35	$ 0.32	$ 0.48	$ 0.52	$ 0.23	$ 0.86	$ 1.55	$ (4.52)