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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

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