Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets, Fair Value Disclosure [Abstract]
Derivative instruments	$ 68,900	$ 22,739
Liabilities, Fair Value Disclosure [Abstract]
Derivative instruments	79,925	810
Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Cash	1,139,554	207,953
Derivative instruments	68,900	22,739
Total financial assets	2,315,197	1,163,490
Liabilities, Fair Value Disclosure [Abstract]
Derivative instruments	79,925	810
Fair Value, Measurements, Recurring [Member] \| Money market and deposit accounts [Member]
Assets, Fair Value Disclosure [Abstract]
Financial instruments	1,089,284	402,964
Fair Value, Measurements, Recurring [Member] \| Publicly traded equity securities [Member]
Assets, Fair Value Disclosure [Abstract]
Financial instruments	3,353
Fair Value, Measurements, Recurring [Member] \| U.S. government securities [Member]
Assets, Fair Value Disclosure [Abstract]
Financial instruments		336,440
Fair Value, Measurements, Recurring [Member] \| U.S. government agency securities [Member]
Assets, Fair Value Disclosure [Abstract]
Financial instruments		192,955
Fair Value, Measurements, Recurring [Member] \| Certificates of deposit [Member]
Assets, Fair Value Disclosure [Abstract]
Financial instruments	14,106	439
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash	1,139,554	207,953
Derivative instruments	0	0
Total financial assets	2,232,191	947,357
Liabilities, Fair Value Disclosure [Abstract]
Derivative instruments	0	0
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member] \| Money market and deposit accounts [Member]
Assets, Fair Value Disclosure [Abstract]
Financial instruments	1,089,284	402,964
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member] \| Publicly traded equity securities [Member]
Assets, Fair Value Disclosure [Abstract]
Financial instruments	3,353
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member] \| U.S. government securities [Member]
Assets, Fair Value Disclosure [Abstract]
Financial instruments		336,440
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member] \| U.S. government agency securities [Member]
Assets, Fair Value Disclosure [Abstract]
Financial instruments		0
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member] \| Certificates of deposit [Member]
Assets, Fair Value Disclosure [Abstract]
Financial instruments	0	0
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash	0	0
Derivative instruments	68,900	22,739
Total financial assets	83,006	216,133
Liabilities, Fair Value Disclosure [Abstract]
Derivative instruments	79,925	810
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member] \| Money market and deposit accounts [Member]
Assets, Fair Value Disclosure [Abstract]
Financial instruments	0	0
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member] \| Publicly traded equity securities [Member]
Assets, Fair Value Disclosure [Abstract]
Financial instruments	0
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member] \| U.S. government securities [Member]
Assets, Fair Value Disclosure [Abstract]
Financial instruments		0
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member] \| U.S. government agency securities [Member]
Assets, Fair Value Disclosure [Abstract]
Financial instruments		192,955
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member] \| Certificates of deposit [Member]
Assets, Fair Value Disclosure [Abstract]
Financial instruments	$ 14,106	$ 439

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash
-URI http://asc.fasb.org/extlink&oid=6506951

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash Equivalents
-URI http://asc.fasb.org/extlink&oid=6507016

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=51814546&loc=SL51823488-111719

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=51814546&loc=SL51823488-111719

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313

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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Trading Securities
-URI http://asc.fasb.org/extlink&oid=6526789

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 35
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Available-for-Sale Securities
-URI http://asc.fasb.org/extlink&oid=6505594

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 1
-Subparagraph a, f, g
-Article 7

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