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
	Mar. 29, 2014	Mar. 30, 2013
Accounting Policies [Abstract]
Net earnings	$ 4,629	$ 3,707
Weighted-average number of common shares outstanding
Basic weighted-average common shares outstanding	10,844	10,600
Dilutive potential common shares	263	70
Diluted weighted-average common shares outstanding	11,107	10,670
Earnings Per Share
Basic (in dollars per share)	$ 0.43	$ 0.35
Diluted (in dollars per share)	$ 0.42	$ 0.35