Reconciliation of Number of Common Shares Used in Calculation of Basic and Diluted Earnings Per Share (EPS) (Detail) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Earnings Per Share [Line Items]
Weighted average shares - Basic	17,384,382	17,233,012	17,360,749	17,220,146
Effect of dilutive securities, shares	117,837	105,376	139,870	144,290
Diluted EPS, shares	17,502,219	17,338,388	17,500,619	17,364,436
Basic EPS	$ 0.24	$ 0.37	$ 0.28	$ 0.66
Effect of dilutive securities		(0.01)	(0.01)	(0.01)
Diluted EPS	$ 0.24	$ 0.36	$ 0.27	$ 0.65