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Marketable Securities - Schedule of Available-for-Sale Securities Reconciliation (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 1,002,521	$ 2,949,502
Unrealized Gain	58	1,049
Unrealized Loss	(3,104)	(4,793)
Fair Value	999,475	2,945,758
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	164,619	593,599
Unrealized Gain	16	82
Unrealized Loss	(320)	(1,693)
Fair Value	164,315	591,988
Foreign Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,486	6,982
Unrealized Gain	1
Unrealized Loss	(24)	(30)
Fair Value	3,463	6,952
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	725,778	1,977,329
Unrealized Gain	41	897
Unrealized Loss	(2,760)	(3,066)
Fair Value	723,059	1,975,160
Time Deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	108,638	371,515
Unrealized Loss		(4)
Fair Value	108,638	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	60,532	194,377
Unrealized Gain	0
Unrealized Loss	(1)	(1)
Fair Value	60,531	194,376
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	941,989	2,755,125
Unrealized Gain	58	1,049
Unrealized Loss	(3,103)	(4,792)
Fair Value	$ 938,944	$ 2,751,382

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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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