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Equity and Liability Components of Notes (Detail) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Principal amount of convertible notes outstanding $ 407,850 $ 450,250
Unamortized discount of liability component (26,573) (30,020)
Less: current portion 3,240 3,381
Long-term debt 378,037 416,849
Convertible Senior Notes
    
Debt Instrument [Line Items]    
Principal amount of convertible notes outstanding 150,000 150,000
Unamortized discount of liability component (20,323) (23,082)
Net carrying amount of liability component 129,677 126,918
Less: current portion 0 0
Long-term debt 129,677 126,918
Carrying value of equity component, net of issuance costs $ 20,993 $ 20,993
Remaining amortization period of discount on the liability component 4 years 7 months 6 days 5 years 3 months 18 days