Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Derivative instruments	$ 18,453	$ 69,979
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Fair value of derivative liabilities, Gross amounts	35,859	10,959
Fair value, measurements, recurring [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and cash equivalents	1,130,270	345,119
Derivative instruments	18,453	69,979
Total financial assets	1,658,898	831,906
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Fair value of derivative liabilities, Gross amounts	35,859	10,959
Total financial liabilities	35,859	10,959
Fair value, measurements, recurring [Member] \| Money market and deposit accounts [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Financial assets	469,718	400,388
Fair value, measurements, recurring [Member] \| Publicly traded equity securities [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Financial assets	7,701	6,463
Fair value, measurements, recurring [Member] \| Certificates of deposit [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Financial assets	32,756	9,957
Fair value, measurements, recurring [Member] \| Level 1 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and cash equivalents	1,130,270	345,119
Derivative instruments	0	0
Total financial assets	1,607,689	751,970
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Fair value of derivative liabilities, Gross amounts	0	0
Total financial liabilities	0	0
Fair value, measurements, recurring [Member] \| Level 1 [Member] \| Money market and deposit accounts [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Financial assets	469,718	400,388
Fair value, measurements, recurring [Member] \| Level 1 [Member] \| Publicly traded equity securities [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Financial assets	7,701	6,463
Fair value, measurements, recurring [Member] \| Level 1 [Member] \| Certificates of deposit [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Financial assets	0	0
Fair value, measurements, recurring [Member] \| Level 2 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and cash equivalents	0	0
Derivative instruments	18,453	69,979
Total financial assets	51,209	79,936
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Fair value of derivative liabilities, Gross amounts	35,859	10,959
Total financial liabilities	35,859	10,959
Fair value, measurements, recurring [Member] \| Level 2 [Member] \| Money market and deposit accounts [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Financial assets	0	0
Fair value, measurements, recurring [Member] \| Level 2 [Member] \| Publicly traded equity securities [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Financial assets	0	0
Fair value, measurements, recurring [Member] \| Level 2 [Member] \| Certificates of deposit [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Financial assets	$ 32,756	$ 9,957

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=66048111&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

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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=84234895&loc=SL5624163-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82849420&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=82924980&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=82924980&loc=SL51823488-111719

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- Definition

Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

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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
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(12))
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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 35
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