Supplemental Disclosure of Cash Flow Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2015	Oct. 03, 2014	Oct. 02, 2015	Oct. 03, 2014
Cash paid during period:
Income taxes			$ 17,087	$ 17,458
Non-cash investing and financing activities:
Unrealized (loss) gain on short-term investments	$ 13	$ (13)	(4)	9
Vested stock unit awards issued to settle accrued bonuses			6,169	6,008
Accrual for capital expenditures			805	164
Stock repurchases payable to broker			$ 0	$ 1,551