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Effective Income Tax Reconciliation (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income before taxes as reported in the statements of income		$ 970,946	$ 896,672	$ 873,790
Statutory tax rate in Israel		24.00%	25.00%	26.50%
Effect of "Preferred Enterprise" status	[1]	(11.00%)	(5.00%)	(7.00%)
Decrease in US deferred tax due to US tax rate change		4.00%
Others, net			(1.00%)	2.00%
Effective tax rate		17.00%	19.00%	21.50%
[1] Basic earnings per share amounts of the benefit resulting from the "Technological preferred or Preferred Enterprise" status $ 0.68 $ 0.26 $ 0.31 Diluted earnings per share amounts of the benefit resulting from the "Technological preferred or Preferred Enterprise" status $ 0.66 $ 0.26 $ 0.30

X

- Definition

Percentage of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to increase (decrease) in income tax rate pursuant to Tax Cuts and Jobs Act of 2017.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the income tax rates.

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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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