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Financial Income, Net (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Amortization of marketable securities premium and accretion of discount, net $ 29,611 $ 33,021 $ 22,389
Financial income, net 34,073 28,762 34,931
Financial Income      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Interest income 67,581 65,497 71,107
Realized gain on sale of marketable securities 16 288 2,311
Foreign currency re-measurement gain and others     893
Total financial income 67,597 65,785 74,311
Financial Expense      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Amortization of marketable securities premium and accretion of discount, net 29,622 33,021 37,903
Foreign currency re-measurement loss 485 1,844  
Others 3,417 2,158 1,477
Total financial expense $ 33,524 $ 37,023 $ 39,380