Reconciliation of Shares Used to Calculate Basic and Diluted Net Income Per Share (Detail) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 03, 2014	Sep. 27, 2013	Oct. 03, 2014	Sep. 27, 2013
Schedule Of Earnings Per Share Basic and Diluted [Line Items]
Shares used in basic per share computation	13,469	13,598	13,509	13,638
Shares used in diluted per share computation	13,824	13,993	13,889	14,047
Employee Stock Option
Schedule Of Earnings Per Share Basic and Diluted [Line Items]
Effect of dilutive stock outstanding	59	83	69	78
Restricted Stock Units (RSUs)
Schedule Of Earnings Per Share Basic and Diluted [Line Items]
Effect of dilutive stock outstanding	296	312	311	331