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Debt - 3.75% Convertible Senior Notes - Additional Information (Detail) - USD ($)
shares in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Oct. 01, 2014
Jun. 30, 2014
Apr. 30, 2014
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Debt Instrument [Line Items]              
Loss on extinguishment on debt           $ 2,148,000  
Total consideration for repurchase of warrants         $ 154,681,000 177,423,000  
Gain (loss) on change in the fair value of the derivative liability       $ (20,200,000)      
Additional Warrant [Member]              
Debt Instrument [Line Items]              
Total consideration for repurchase of warrants       154,700,000      
Gain (loss) on change in the fair value of the derivative liability       $ (20,200,000)      
3.75% Convertible Senior Notes [Member]              
Debt Instrument [Line Items]              
Convertible notes, outstanding amount             $ 360,000,000
Cancellation of convertible notes     $ 56,300,000        
Aggregate consideration for cancellation of convertible notes     $ 120,200,000        
Value of convertible notes converted by a holder   $ 15,300,000          
Loss on extinguishment on debt           2,100,000  
Reduction in stockholder's equity due to repurchase and conversion transactions           $ 52,000,000  
Common stock principal amount of convertible notes $ 1,000            
Conversion settlement amount of convertible notes $ 1,000            
Warrants repurchased           7.2  
Total consideration for repurchase of warrants           $ 173,400,000  
Gain (loss) on change in the fair value of the derivative liability           (11,600,000)  
3.75% Convertible Senior Notes [Member] | Additional Paid-in Capital [Member]              
Debt Instrument [Line Items]              
Reduction in stockholder's equity due to repurchase and conversion transactions           159,000,000  
3.75% Convertible Senior Notes [Member] | Additional Warrant [Member]              
Debt Instrument [Line Items]              
Reduction in stockholder's equity due to repurchase and conversion transactions           145,400,000  
Warrants repurchased       4.7      
Gain (loss) on change in the fair value of the derivative liability           $ 7,100,000