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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