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Equity and Liability Components of Notes (Detail) - Long-term Debt, Type [Domain] - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Principal amount of the Notes outstanding $ 343,762 $ 344,490
Unamortized discount of liability component (14,232) (19,217)
Less: current portion 5,513 496
Long-term debt 324,017 324,777
Convertible Senior Notes    
Debt Instrument [Line Items]    
Principal amount of the Notes outstanding 150,000 150,000
Unamortized discount of liability component (13,308) (15,399)
Net carrying amount of liability component 136,692 134,601
Less: current portion 0 0
Long-term debt 136,692 134,601
Carrying value of equity component, net of issuance costs $ 20,993 $ 20,993
Remaining amortization period of discount on the liability component 2 years 9 months 18 days 3 years 3 months 18 days