Supplemental Disclosure of Cash Flow Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2015	Jul. 04, 2014	Jul. 03, 2015	Jul. 04, 2014
Cash paid during period:
Income taxes			$ 10,235	$ 9,346
Non-cash investing and financing activities:
Unrealized (loss) gain on short-term investments	$ (10)	$ 8	(17)	22
Vested stock unit awards issued to settle accrued bonuses			6,169	6,008
Accrual for capital expenditures			$ 226	$ 767