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Marketable Securities - Schedule of Available-for-Sale Securities Reconciliation (Detail) - USD ($) $ in Thousands | Sep. 28, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 213 | $ 1,002,521
Unrealized Gain |  | 58
Unrealized Loss |  | (3,104)
Fair Value | 213 | 999,475
US Treasury Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 164,619
Unrealized Gain |  | 16
Unrealized Loss |  | (320)
Fair Value |  | 164,315
Foreign Government Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 3,486
Unrealized Gain |  | 1
Unrealized Loss |  | (24)
Fair Value |  | 3,463
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 725,778
Unrealized Gain |  | 41
Unrealized Loss |  | (2,760)
Fair Value |  | 723,059
Time Deposits [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 213 | 108,638
Fair Value | 213 | 108,638
Cash Equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 213 | 60,532
Unrealized Loss |  | (1)
Fair Value | $ 213 | 60,531
Short-term Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 941,989
Unrealized Gain |  | 58
Unrealized Loss |  | (3,103)
Fair Value |  | $ 938,944

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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