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Marketable Securities - Schedule of Available-for-Sale Securities Reconciliation (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 1,682,990	$ 2,949,502
Unrealized Gain	457	1,049
Unrealized Loss	(5,724)	(4,793)
Fair Value	1,677,723	2,945,758
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	239,150	593,599
Unrealized Gain	3	82
Unrealized Loss	(1,394)	(1,693)
Fair Value	237,759	591,988
Foreign Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,992	6,982
Unrealized Loss	(38)	(30)
Fair Value	2,954	6,952
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,202,456	1,977,329
Unrealized Gain	384	897
Unrealized Loss	(4,291)	(3,066)
Fair Value	1,198,549	1,975,160
Time Deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	238,315	371,515
Unrealized Loss	(1)	(4)
Fair Value	238,314	371,511
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	77	77
Unrealized Gain	70	70
Fair Value	147	147
Cash Equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	171,433	194,377
Unrealized Gain	1
Unrealized Loss		(1)
Fair Value	171,434	194,376
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,511,557	2,755,125
Unrealized Gain	456	1,049
Unrealized Loss	(5,724)	(4,792)
Fair Value	$ 1,506,289	$ 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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