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Fair Value Measurements - Additional Information (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Stock Price Change, Percent 28.00%  
Debt discount $ 52.4 $ 52.4
Change in the fair value of the call option feature 0.2  
3.75% Convertible Notes | Investor
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Principal Amount Of Modified Debt Held $ 59.5 $ 59.5