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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