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Marketable Securities - Schedule of Available-for-Sale Securities Reconciliation (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 2,033,001	$ 2,949,502
Unrealized Gain	399	1,049
Unrealized Loss	(7,119)	(4,793)
Fair Value	2,026,281	2,945,758
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	426,999	593,599
Unrealized Gain	1	82
Unrealized Loss	(1,968)	(1,693)
Fair Value	425,032	591,988
Foreign Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,987	6,982
Unrealized Loss	(40)	(30)
Fair Value	6,947	6,952
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,297,659	1,977,329
Unrealized Gain	328	897
Unrealized Loss	(5,109)	(3,066)
Fair Value	1,292,878	1,975,160
Time Deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	301,279	371,515
Unrealized Loss	(2)	(4)
Fair Value	301,277	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	190,931	194,377
Unrealized Gain	1
Unrealized Loss	(2)	(1)
Fair Value	190,930	194,376
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,842,070	2,755,125
Unrealized Gain	398	1,049
Unrealized Loss	(7,117)	(4,792)
Fair Value	$ 1,835,351	$ 2,751,382

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
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