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Marketable Securities - Schedule of Available-for-Sale Securities Reconciliation (Detail) - USD ($) $ in Thousands | Mar. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 522,882 | $ 1,002,521
Unrealized Gain | 134 | 58
Unrealized Loss | (836) | (3,104)
Fair Value | 522,180 | 999,475
US Treasury Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 98,723 | 164,619
Unrealized Gain | 12 | 16
Unrealized Loss | (159) | (320)
Fair Value | 98,576 | 164,315
Foreign Government Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 3,489 | 3,486
Unrealized Gain | 1 | 1
Unrealized Loss | (14) | (24)
Fair Value | 3,476 | 3,463
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 368,163 | 725,778
Unrealized Gain | 121 | 41
Unrealized Loss | (663) | (2,760)
Fair Value | 367,621 | 723,059
Time Deposits [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 52,507 | 108,638
Fair Value | 52,507 | 108,638
Cash Equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 39,886 | 60,532
Unrealized Gain | 1 |
Unrealized Loss | 0 | (1)
Fair Value | 39,887 | 60,531
Short-term Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 482,996 | 941,989
Unrealized Gain | 133 | 58
Unrealized Loss | (836) | (3,103)
Fair Value | $ 482,293 | $ 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=82897076&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References No definition available. + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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