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Commitments And Contingent Liabilities - Additional Information (Detail) In Thousands, unless otherwise specified | 12 Months Ended |
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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

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