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Financial Income, Net (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Amortization of marketable securities premium and accretion of discount, net $ 33,784 $ 28,092 $ 14,428
Financial income, net 40,332 39,023 30,164
Financial Income
      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Interest income 73,711 68,351 53,567
Realized gain (loss) on sale of marketable securities 1,436 672 974
Foreign currency re-measurement gain and others 873 14  
Total financial income 76,020 69,037 54,541
Financial Expense
      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Amortization of marketable securities premium and accretion of discount, net 33,784 28,092 14,428
Foreign currency re-measurement loss     2,808
Others 1,904 1,922 7,141
Total financial expense $ 35,688 $ 30,014 $ 24,377