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Components of Long Term Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Principal amount of convertible notes outstanding $ 386,232 $ 387,042
Less: unamortized discount (23,712) (24,907)
Less: current portion (3,250) (3,245)
Long-term debt 359,270 358,890
Term loan credit agreement
   
Debt Instrument [Line Items]    
Principal amount of convertible notes outstanding 234,230 234,923
Industrial revenue bond
   
Debt Instrument [Line Items]    
Principal amount of convertible notes outstanding 2,002 2,119
Convertible Senior Notes
   
Debt Instrument [Line Items]    
Principal amount of convertible notes outstanding 150,000 150,000
Less: unamortized discount (18,404) (19,372)
Less: current portion 0 0
Long-term debt $ 131,596 $ 130,628