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Cash, Cash Equivalents and Investments - Gross Unrealized Losses and Fair Value for Available-for-Sale Investments (Detail) $ in Thousands	Dec. 31, 2015 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 months	$ 411,183
Unrealized Losses, Less than 12 months	(1,615)
Fair Value, Greater than 12 Months	26,729
Unrealized Losses, Greater than 12 Months	(203)
Fair Value	437,912
Unrealized Losses	(1,818)
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 months	162,714
Unrealized Losses, Less than 12 months	(1,092)
Fair Value, Greater than 12 Months	24,946
Unrealized Losses, Greater than 12 Months	(197)
Fair Value	187,660
Unrealized Losses	(1,289)
Treasury Bills [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 months	127,203
Unrealized Losses, Less than 12 months	(252)
Fair Value	127,203
Unrealized Losses	(252)
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 months	77,165
Unrealized Losses, Less than 12 months	(154)
Fair Value, Greater than 12 Months	1,783
Unrealized Losses, Greater than 12 Months	(6)
Fair Value	78,948
Unrealized Losses	(160)
Agency Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 months	9,158
Unrealized Losses, Less than 12 months	(20)
Unrealized Losses, Greater than 12 Months	0
Fair Value	9,158
Unrealized Losses	(20)
Sovereign Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 months	34,943
Unrealized Losses, Less than 12 months	(97)
Fair Value	34,943
Unrealized Losses	$ (97)

X

- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563

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+ References

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-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Section 50
-Paragraph 6
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-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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