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Debt - Additional Information (Detail) - USD ($)
$ in Thousands, shares in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2015
Jun. 30, 2015
Debt Instrument [Line Items]    
Total consideration for repurchase of warrants   $ 154,681
3.75% Convertible Senior Notes [Member]    
Debt Instrument [Line Items]    
Warrants repurchased 4.7  
Total consideration for repurchase of warrants $ 154,700  
Gain (loss) on change in the fair value of the derivative liability   $ 20,200