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2.25% Convertible Senior Notes Due 2019 - Carrying Amounts of Liability and Equity Components (Parenthetical) (Detail) (2.25% Convertible Senior Notes Due 2019 [Member], USD $)	6 Months Ended
	Jun. 30, 2014
2.25% Convertible Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Transaction costs related to the equity component	$ 1,177,190
Remaining period over which the unamortized debt discount will be amortized	5 years
Debt instrument, interest rate	2.25%
Debt instrument, maturity year	2019

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- Definition

Transaction Costs Allocated Between Liability And Equity Components

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- Definition

Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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