Supplemental Disclosure of Cash Flow Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 04, 2014	Mar. 29, 2013
Cash paid during period:
Income taxes	$ 428	$ 623
Non-cash investing and financing activities:
Unrealized gain (loss) on short-term investments	14	(12)
Vested stock unit awards issued to settle accrued bonuses	6,008	5,807
Stock repurchases payable to broker	$ 800	$ 694