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Equity and Liability Components of Notes (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Feb. 29, 2016
Debt Instrument [Line Items]      
Principal amount of convertible Notes outstanding $ 287,773 $ 323,548 $ 12,017,000
Unamortized fees and discount of liability component (7,632) (11,052)  
Less: current portion (2,451) (37,611)  
Long-term debt 277,690 274,885  
Convertible Senior Notes      
Debt Instrument [Line Items]      
Principal amount of convertible Notes outstanding 95,835 131,000  
Unamortized fees and discount of liability component (6,513) (9,888)  
Net carrying amount of liability component 89,322 121,112  
Less: current portion 0 (35,165)  
Long-term debt 89,322 85,947  
Carrying value of equity component, net of issuance costs $ 6,835 $ 15,810  
Remaining amortization period of discount on the liability component 2 years 1 month 6 days 2 years 3 months 18 days