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Commitments And Contingent Liabilities - Additional Information (Detail) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2012 Israeli Tax Authority Two Thousand Two Through Two Thousand Seven USD ($)	Dec. 31, 2012 Israeli Tax Authority Two Thousand Two Through Two Thousand Seven ILS	Dec. 31, 2012 Israeli Tax Authority Two Thousand Eight USD ($)	Dec. 31, 2012 Israeli Tax Authority Two Thousand Eight ILS
Restructuring Cost and Reserve [Line Items]
Rent expenses	$ 5,408	$ 5,950	$ 6,193
Additional taxes demanded by tax authority				$ 755,000	2,819,000	$ 68,000	254,000

X

- Definition

The estimated range of reasonably possible losses resulting from an adverse position taken by a taxing authority.

+ References

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

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 14

-Paragraph 3

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (d)(3)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

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- Definition

Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses.

+ References

No definition available.

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