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Schedule of Share-based Compensation Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Total share-based compensation expense $ 6,662 $ 6,942
Direct Cost Of Revenues    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Total share-based compensation expense 3,848 3,899
Selling, General And Administrative Expenses    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Total share-based compensation expense 2,709 $ 3,043
Special Charges    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Total share-based compensation expense $ 105