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Effective Income Tax Reconciliation (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Income before taxes as reported in the statements of income $ 873,790 $ 829,816 $ 795,836
Statutory tax rate in Israel 26.50% 26.50% 25.00%
Effect of "Preferred Enterprise" status [1] (7.00%) (5.00%) (6.00%)
Others, net 2.00% (1.00%) (1.00%)
Effective tax rate 21.50% 20.50% 18.00%
[1] Basic earnings per share amounts of the benefit resulting from the "Preferred Enterprise" status $ 0.31 $ 0.22 $ 0.24 Diluted earnings per share amounts of the benefit resulting from the "Preferred Enterprise" status $ 0.30 $ 0.22 $ 0.24