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Marketable Securities - Schedule of Available-for-Sale Securities Reconciliation (Detail) - USD ($) $ in Thousands	Jun. 29, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 218,516	$ 1,002,521
Unrealized Gain	41	58
Unrealized Loss	(33)	(3,104)
Fair Value	218,524	999,475
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	66,221	164,619
Unrealized Gain	4	16
Unrealized Loss		(320)
Fair Value	66,225	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	94,331	725,778
Unrealized Gain	37	41
Unrealized Loss	(33)	(2,760)
Fair Value	94,335	723,059
Time Deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	57,964	108,638
Unrealized Loss	0
Fair Value	57,964	108,638
Cash Equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	130,744	60,532
Unrealized Gain	5
Unrealized Loss		(1)
Fair Value	130,749	60,531
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	87,772	941,989
Unrealized Gain	36	58
Unrealized Loss	(33)	(3,103)
Fair Value	$ 87,775	$ 938,944

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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

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