Debt - Additional Information (Detail) (USD $) Share data in Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015
Debt Instrument [Line Items]
Total consideration for repurchase of warrants	$ 154,681,000us-gaap_PaymentsForRepurchaseOfWarrants
3.75% Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Warrants repurchased	4.7
Total consideration for repurchase of warrants	154,681,000
Gain (loss) on change in the fair value of the derivative liability	$ 20,200,000

Number of warrants associated with the convertible notes that were repurchased during the period.

No definition available.

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- Details

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- Definition

Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959

+ Details

Name:	us-gaap_GainLossOnDerivativeInstrumentsNetPretax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The aggregate amount paid by the entity to reacquire the right to purchase equity shares at a predetermined price, usually issued together with corporate debt.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

+ Details

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Balance Type:	credit
Period Type:	duration

- Details

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