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Components of Convertible Senior Notes (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Debt Instrument  
Debt principal $ 189,998us-gaap_DebtInstrumentFaceAmount
Unamortized discount 4,290us-gaap_DebtInstrumentUnamortizedDiscount
Net carrying amount of the convertible debt $ 185,708us-gaap_ConvertibleDebt