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Effective Income Tax Reconciliation (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Income Tax Rate Reconciliation [Line Items]
Income before taxes as reported in the statements of income	$ 829,816us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments		$ 795,836us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments		$ 786,867us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Statutory tax rate in Israel	26.50%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate		25.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate		25.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Effect of "Preferred Enterprise" status	(5.00%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	[1]	(6.00%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	[1]	(7.00%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	[1]
Others, net	(1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments		(1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments		3.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective tax rate	20.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations		18.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations		21.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
[1] Basic earnings per share amounts of the benefit resulting from the "Preferred Enterprise" status $ 0.22 $ 0.24 $ 0.24 Diluted earnings per share amounts of the benefit resulting from the "Preferred Enterprise" status $ 0.22 $ 0.24 $ 0.23

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

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 12

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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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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 other adjustments.

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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