Cash, Cash Equivalents, and Investments - Components of Cash, Cash Equivalents, and Investments (Detail) - USD ($) $ in Thousands	Jul. 02, 2017	Dec. 31, 2016	Jul. 03, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Cash	$ 64,712	$ 77,307
Money market instruments	3,554	2,334
Cash and cash equivalents	68,266	79,641	$ 54,929	$ 51,975
Short-term investments	342,402	341,194
Long-term investments	354,658	324,335
Total	765,326	745,170
Treasury Bills
Schedule of Available-for-sale Securities [Line Items]
Short-term investments	97,018	67,175
Long-term investments	55,545	92,280
Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Short-term investments	86,000	141,188
Long-term investments	239,159	169,952
Euro Liquidity Fund
Schedule of Available-for-sale Securities [Line Items]
Short-term investments	79,256	46,499
Asset-Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Short-term investments	42,449	69,614
Long-term investments	44,811	26,946
Sovereign Bonds
Schedule of Available-for-sale Securities [Line Items]
Short-term investments	24,454	7,298
Long-term investments	6,479	23,585
Agency Bonds
Schedule of Available-for-sale Securities [Line Items]
Short-term investments	7,610	2,903
Long-term investments	5,802	10,339
Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Short-term investments	5,615	6,517
Long-term investments	$ 2,862	$ 1,233