Supplemental Disclosure of Cash Flow Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 03, 2014	Sep. 27, 2013	Oct. 03, 2014	Sep. 27, 2013
Cash paid during period:
Income taxes			$ 17,458	$ 17,027
Non-cash investing and financing activities:
Unrealized gain (loss) on available for sale investment securities, net of tax	(13)	(3)	9	(25)
Vested stock unit awards issued to settle accrued bonuses			6,008	5,807
Accrual for capital expenditures			$ 164	$ 0