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Equity and Liability Components of Notes (Detail) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Principal amount of the Notes outstanding $ 286,550 $ 323,548
Unamortized discount and fees of liability component (6,061) (11,052)
Less: current portion (2,462) (37,611)
Long-term debt 278,027 274,885
Convertible Senior Notes    
Debt Instrument [Line Items]    
Principal amount of the Notes outstanding 95,835 131,000
Unamortized discount and fees of liability component (5,034) (9,888)
Net carrying amount of liability component 90,801 121,112
Less: current portion 0 (35,165)
Long-term debt 90,801 85,947
Carrying value of equity component, net of issuance costs $ 6,835 $ 15,810
Remaining amortization period of discount on the liability component 1 year 7 months 6 days 2 years 3 months 18 days