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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total equity-based compensation expense $ 6,236 $ 4,015 $ 5,011
Cost of revenues      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total equity-based compensation expense 246 155 193
Research and development, net      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total equity-based compensation expense 2,860 1,838 2,027
Sales and marketing      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total equity-based compensation expense 922 568 909
General and administrative      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total equity-based compensation expense $ 2,208 $ 1,454 $ 1,882