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Share-Based Compensation - Schedule of Share-based Compensation Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Total share-based compensation expense $ 5,968 $ 6,681
Direct cost of revenues    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Total share-based compensation expense 3,779 5,838
Selling, general and administrative expenses    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Total share-based compensation expense $ 2,189 $ 843