Cash, Cash Equivalents, and Investments - Components of Cash, Cash Equivalents, and Investments (Detail) - USD ($) $ in Thousands	Jul. 03, 2016	Dec. 31, 2015	Jul. 05, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Cash	$ 47,751	$ 45,951
Money market instruments	7,178	6,024
Cash and cash equivalents	54,929	51,975	$ 61,691	$ 55,694
Short-term investments	294,593	296,468
Limited partnership interest (accounted for using cost method)	942	942
Long-term investments	307,703	273,088
Total	657,225	621,531
Treasury Bills
Schedule of Available-for-sale Securities [Line Items]
Short-term investments	42,013	109,360
Long-term investments	68,966	44,437
Euro Liquidity Fund
Schedule of Available-for-sale Securities [Line Items]
Short-term investments	48,941	47,730
Asset-Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Short-term investments	68,879	61,994
Long-term investments	36,306	24,582
Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Short-term investments	90,700	54,376
Long-term investments	158,222	176,575
Agency Bonds
Schedule of Available-for-sale Securities [Line Items]
Short-term investments	13,177	978
Long-term investments	18,604	8,180
Sovereign Bonds
Schedule of Available-for-sale Securities [Line Items]
Short-term investments	24,022	21,440
Long-term investments	24,159	13,503
Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Short-term investments	6,861	590
Long-term investments	$ 504	$ 4,869