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Schedule of Carrying Amounts and Fair Values of Financial Instrument (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Mar. 31, 2009
Fair Value, Balance Sheet Grouping, Financial Statement Captions          
Cash and cash equivalents, Carrying Value $ 338,920 $ 573,736 $ 397,737 $ 416,737  
Convertible debt, Carrying Value 169,896 156,098      
Japan loan, Carrying Value         10,000
Carrying Value
         
Fair Value, Balance Sheet Grouping, Financial Statement Captions          
Cash and cash equivalents, Carrying Value 338,920 573,736      
Marketable securities, Carrying Value 667,388 180,909      
Convertible debt, Carrying Value 169,896 [1] 156,098 [1]      
Japan loan, Carrying Value 3,491 6,431      
Fair Value
         
Fair Value, Balance Sheet Grouping, Financial Statement Captions          
Cash and cash equivalents, Fair Value 338,920 573,736      
Marketable securities, Fair Value 667,388 180,909      
Convertible debt, Fair Value 589,000 [1] 485,925 [1]      
Japan loan, Fair Value $ 3,491 $ 6,431      
[1] The carrying value represents the bifurcated debt component only, while the fair value is based on quoted market prices for the convertible note which includes the equity conversion feature.