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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

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