Effect of Recording Equity-Based Compensation (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Equity Based Compensation Related to Employee Stock Purchase Programs [Line Items]
Total equity-based compensation	$ 666,000	$ 519,000	$ 1,363,000	$ 1,082,000
Tax benefit recognized	3,000	5,000	6,000	10,000
Stock Options
Equity Based Compensation Related to Employee Stock Purchase Programs [Line Items]
Total equity-based compensation	153,000	104,000	394,000	277,000
Restricted Stock Units (RSUs)
Equity Based Compensation Related to Employee Stock Purchase Programs [Line Items]
Total equity-based compensation	376,000	108,000	668,000	184,000
Employee Stock Purchase Plan
Equity Based Compensation Related to Employee Stock Purchase Programs [Line Items]
Total equity-based compensation	$ 137,000	$ 307,000	$ 301,000	$ 621,000