Cash, Cash Equivalents, and Investments - Components of Cash, Cash Equivalents, and Investments (Detail) - USD ($) $ in Thousands	Oct. 02, 2016	Dec. 31, 2015	Oct. 04, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Cash	$ 54,791	$ 45,951
Money market instruments	6,354	6,024
Cash and cash equivalents	61,145	51,975	$ 79,563	$ 55,694
Short-term investments	328,378	296,468
Limited partnership interest (accounted for using cost method)	0	942
Long-term investments	315,927	273,088
Total	705,450	621,531
Treasury Bills
Schedule of Available-for-sale Securities [Line Items]
Short-term investments	36,728	109,360
Long-term investments	70,579	44,437
Euro Liquidity Fund
Schedule of Available-for-sale Securities [Line Items]
Short-term investments	49,586	47,730
Asset-Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Short-term investments	64,740	61,994
Long-term investments	38,782	24,582
Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Short-term investments	134,245	54,376
Long-term investments	163,534	176,575
Agency Bonds
Schedule of Available-for-sale Securities [Line Items]
Short-term investments	4,904	978
Long-term investments	18,648	8,180
Sovereign Bonds
Schedule of Available-for-sale Securities [Line Items]
Short-term investments	28,720	21,440
Long-term investments	24,384	13,503
Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Short-term investments	9,455	590
Long-term investments	$ 0	$ 4,869