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Equity-Based Compensation Expense Included in Interim Condensed Consolidated Statements of Income (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total equity-based compensation expense $ 1,119 $ 1,122 $ 2,795 $ 3,983
Cost of revenues        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total equity-based compensation expense 34 45 111 159
Research and development, net        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total equity-based compensation expense 438 441 1,323 1,575
Sales and marketing        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total equity-based compensation expense 151 185 395 753
General and administrative        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total equity-based compensation expense $ 496 $ 451 $ 966 $ 1,496