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Marketable Securities - Schedule of Available-for-Sale Securities Reconciliation (Detail) - USD ($) $ in Thousands	Sep. 29, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 1,521,165	$ 2,949,502
Unrealized Gain	424	1,049
Unrealized Loss	(4,060)	(4,793)
Fair Value	1,517,529	2,945,758
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	272,812	593,599
Unrealized Gain		82
Unrealized Loss	(894)	(1,693)
Fair Value	271,918	591,988
Foreign Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,994	6,982
Unrealized Loss	(36)	(30)
Fair Value	2,958	6,952
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,066,088	1,977,329
Unrealized Gain	424	897
Unrealized Loss	(3,130)	(3,066)
Fair Value	1,063,382	1,975,160
Time Deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	179,271	371,515
Unrealized Loss		(4)
Fair Value	179,271	371,511
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		77
Unrealized Gain		70
Fair Value		147
Cash Equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	122,645	194,377
Unrealized Loss	(3)	(1)
Fair Value	122,642	194,376
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,398,520	2,755,125
Unrealized Gain	424	1,049
Unrealized Loss	(4,057)	(4,792)
Fair Value	$ 1,394,887	$ 2,751,382

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+ References

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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

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