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Equity and Liability Components (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Equity and Liability Components of Notes
Debt Instrument [Line Items]      
Principal amount of convertible notes outstanding     $ 150,000
Unamortized discount of liability component (30,020) 0 (23,082)
Net carrying amount of liability component     126,918
Less: current portion     0
Long-term debt     126,918
Carrying value of equity component, net of issuance costs     $ 20,993
Remaining amortization period of discount on the liability component     5 years 3 months 18 days