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Liability And Equity Components Of Convertible Notes (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Long-Term Debt And Capital Lease Obligations [Line Items]    
Liability component, Principal $ 149,940  
Liability component, Unamortized discount (3,073)  
Equity component (recorded in "Additional paid-in capital") 18,019 18,000
3 3/4% Senior Subordinated Convertible Notes Due 2012
   
Long-Term Debt And Capital Lease Obligations [Line Items]    
Balance of 3 3/4% convertible notes due 2012 $ 146,867