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Cash, Cash Equivalents, and Investments - Components of Cash, Cash Equivalents, and Investments (Detail) - USD ($) $ in Thousands | Oct. 01, 2017 | Dec. 31, 2016 | Oct. 02, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash | $ 104,649 | $ 77,307 |  |
Money market instruments | 6,700 | 2,334 |  |
Cash and cash equivalents | 111,349 | 79,641 | $ 61,145 | $ 51,975
Short-term investments | 273,261 | 341,194 |  |
Long-term investments | 386,501 | 324,335 |  |
Total | 771,111 | 745,170 |  |
Treasury Bills |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Short-term investments | 70,184 | 67,175 |  |
Long-term investments | 63,602 | 92,280 |  |
Corporate Bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Short-term investments | 65,569 | 141,188 |  |
Long-term investments | 245,940 | 169,952 |  |
Euro Liquidity Fund |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Short-term investments | 52,312 | 46,499 |  |
Asset-Backed Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Short-term investments | 47,840 | 69,614 |  |
Long-term investments | 59,069 | 26,946 |  |
Sovereign Bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Short-term investments | 20,945 | 7,298 |  |
Long-term investments | 8,026 | 23,585 |  |
Agency Bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Short-term investments | 7,606 | 2,903 |  |
Long-term investments | 5,639 | 10,339 |  |
Municipal Bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Short-term investments | 8,805 | 6,517 |  |
Long-term investments | $ 4,225 | $ 1,233 |  |

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- Definition Amount of investments in debt securities classified as available-for-sale, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26626-111562 + Details
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