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Details about Accumulated Other Comprehensive Income (Loss) Components (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Cost of revenues $ 1,131 $ 1,046 $ 3,799 $ 2,927
Financial income, net 617 731 2,053 2,653
Research and development 5,619 4,637 16,279 15,548
Sales and marketing 2,376 2,235 7,271 6,628
General and administrative 2,006 1,940 5,588 5,658
Total, before income taxes (510) 2,879 4,050 12,602
Provision for income taxes (187) 285 493 1,672
Total, net of income taxes (323) 2,594 3,557 10,930
Reclassification out of Accumulated Other Comprehensive Income (Loss)
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total, net of income taxes 189   619  
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Unrealized gains (losses) on cash flow hedges
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Cost of revenues 4   13  
Research and development 138   374  
Sales and marketing 8   27  
General and administrative 14   38  
Total, before income taxes 164   452  
Provision for income taxes (17)   (46)  
Total, net of income taxes 147   406  
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Unrealized gains (losses) on available-for-sale marketable securities
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Financial income, net 62   301  
Provision for income taxes (20)   (88)  
Total, net of income taxes $ 42   $ 213