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Effective Income Tax Reconciliation (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income before taxes as reported in the statements of income		$ 896,672	$ 873,790	$ 829,816
Statutory tax rate in Israel		25.00%	26.50%	26.50%
Effect of "Preferred Enterprise" status	[1]	(5.00%)	(7.00%)	(5.00%)
Others, net		(1.00%)	2.00%	(1.00%)
Effective tax rate		19.00%	21.50%	20.50%
[1] Basic earnings per share amounts of the benefit resulting from the "Preferred Enterprise" status $ 0.26 $ 0.31 $ 0.22 Diluted earnings per share amounts of the benefit resulting from the "Preferred Enterprise" status $ 0.26 $ 0.30 $ 0.22

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(2))
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
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-Subparagraph (SAB TOPIC 6.I)
-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
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-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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