Convertible Senior Notes ("Notes"), Note Hedges, and Warrants - Summary of Interest Expense Recognized Related to Notes (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Debt Disclosure [Abstract]
0.75% coupon	$ 654	$ 151	$ 1,948	$ 151
Amortization of debt issuance costs	354	79	1,042	79
Amortization of debt discount	2,961	658	8,698	658
Interest expense recognized related to notes	$ 3,969	$ 888	$ 11,688	$ 888

Amortization Of Debt Issuance Costs

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- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

+ References

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-Topic 835

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-Section S99

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- References

No definition available.

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- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

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Interest expense incurred during the reporting period on subordinated notes and debentures. Includes amortization of expenses incurred in the issuance of subordinated notes and debentures.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

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-Subparagraph (SX 210.9-04.8)

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