Earnings Per Share (Detail) - Basic and Diluted Earnings per share (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 23, 2013	Mar. 24, 2012
Net earnings (in Dollars)	$ 2,060	$ 5,454
Net earnings per share-basic:
Weighted-average shares outstanding	12,998	12,951
Shares contingently issuable	52	184
Weighted-average shares and potential dilutive shares outstanding	13,050	13,135
Net earnings per share-diluted (in Dollars per share)	$ 0.16	$ 0.42
Net earnings per share-basic (in Dollars per share)	$ 0.16	$ 0.42