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2.25% Convertible Senior Notes Due 2019 - Carrying Amounts of Liability and Equity Components (Detail) (USD $)	Jun. 30, 2014
Debt Instrument [Line Items]
Unamortized debt discount	$ 0
2.25% Convertible Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Amount of the equity component	45,807,685
2.25% convertible senior notes due 2019	330,000,000
Unamortized debt discount	(46,984,875)
Transaction costs related to the debt component	(7,090,850)
Net carrying amount	$ 275,924,275

X

- Definition

Debt Instrument Convertible Carrying Amount Of Liability Component

+ References

No definition available.

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- Definition

The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 20

-Section 50

-Paragraph 4

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



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- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 1A

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399



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Amortized cost of investments in debt securities classified as trading.

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