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Equity and Liability Components of Notes (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Principal amount of the Notes outstanding $ 386,232 $ 387,042
Unamortized discount of liability component (23,712) (24,907)
Less: current portion 3,250 3,245
Long-term debt 359,270 358,890
Convertible Senior Notes
    
Debt Instrument [Line Items]    
Principal amount of the Notes outstanding 150,000 150,000
Unamortized discount of liability component (18,404) (19,372)
Net carrying amount of liability component 131,596 130,628
Less: current portion 0 0
Long-term debt 131,596 130,628
Carrying value of equity component, net of issuance costs $ 20,993 $ 20,993
Remaining amortization period of discount on the liability component 4 years 1 month 6 days 4 years 3 months 18 days