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Equity-Based Compensation Expense Included in Interim Condensed Consolidated Statements of Income (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total equity-based compensation expense $ 4,015 $ 5,011 $ 5,920
Cost of revenues      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total equity-based compensation expense 155 193 312
Research and development, net      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total equity-based compensation expense 1,838 2,027 2,014
Sales and marketing      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total equity-based compensation expense 568 909 1,311
General and administrative      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total equity-based compensation expense $ 1,454 $ 1,882 $ 2,283