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Convertible Debentures and Credit Arrangements Schedule of Convertible Senior Debentures (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Convertible senior debentures $ 49,948 $ 48,991
Less: current portion (470) 0
Convertible senior debentures—non-current 49,478 48,991
Convertible Senior Debentures due 2018 [Member]
   
Debt Instrument [Line Items]    
Convertible senior debentures 49,478 48,483
Convertible Senior Debentures due 2024 [Member]
   
Debt Instrument [Line Items]    
Convertible senior debentures 441 441
Convertible Senior Debentures due 2014 [Member]
   
Debt Instrument [Line Items]    
Convertible senior debentures $ 29 $ 67