Cash, Cash Equivalents, and Investments - Components of Cash, Cash Equivalents, and Investments (Detail) - USD ($) $ in Thousands	Apr. 03, 2016	Dec. 31, 2015	Apr. 05, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Cash	$ 48,603	$ 45,951
Money market instruments	31,311	6,024
Cash and cash equivalents	79,914	51,975	$ 36,047	$ 55,694
Short-term investments	319,789	296,468
Limited partnership interest (accounted for using cost method)	942	942
Long-term investments	249,760	273,088
Total	649,463	621,531
Treasury Bills
Schedule of Available-for-sale Securities [Line Items]
Short-term investments	106,602	109,360
Long-term investments	42,938	44,437
Euro Liquidity Fund
Schedule of Available-for-sale Securities [Line Items]
Short-term investments	50,094	47,730
Asset-Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Short-term investments	64,478	61,994
Long-term investments	27,115	24,582
Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Short-term investments	74,627	54,376
Long-term investments	159,221	176,575
Agency Bonds
Schedule of Available-for-sale Securities [Line Items]
Short-term investments	980	978
Long-term investments	8,195	8,180
Sovereign Bonds
Schedule of Available-for-sale Securities [Line Items]
Short-term investments	22,684	21,440
Long-term investments	6,805	13,503
Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Short-term investments	324	590
Long-term investments	$ 4,544	$ 4,869