Reconciliation of Number of Common Shares Used in Calculation of Basic and Diluted Earnings Per Share (EPS) (Detail) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014
Earnings Per Share [Line Items]
Weighted average shares - Basic	17,395,824	17,258,029	17,372,562	17,233,879
Effect of dilutive securities, shares		152,362	123,628	162,909
Diluted EPS, shares	17,395,824	17,410,391	17,496,190	17,396,788
Basic EPS	$ (0.05)	$ 0.65	$ 0.23	$ 1.31
Effect of dilutive securities		(0.01)	(0.01)	(0.02)
Diluted EPS	$ (0.05)	$ 0.64	$ 0.22	$ 1.29