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Financial Income, Net (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Amortization of marketable securities premium and accretion of discount, net | $ 20,012 | $ 23,388 | $ 29,611
Realized gain (loss) loss on sale of marketable securities, net | (176) | 2,993 | 16
Financial income, net | 47,029 | 44,402 | 34,073
Financial Income |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Interest income | 74,900 | 69,425 | 67,581
Realized gain (loss) loss on sale of marketable securities, net |  | 2,993 | 16
Total financial income | 74,900 | 72,418 | 67,597
Financial Expense |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Amortization of marketable securities premium and accretion of discount, net | 20,012 | 23,388 | 29,622
Realized gain (loss) loss on sale of marketable securities, net | (176) |  |
Foreign currency re-measurement loss | 5,555 | 2,658 | 485
Others | 2,128 | 1,970 | 3,417
Total financial expense | $ 27,871 | $ 28,016 | $ 33,524

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