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Schedule of Share-based Compensation Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total share-based compensation expense $ 4,368 $ 6,321 $ 11,310 $ 15,397
Direct Cost Of Revenues        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total share-based compensation expense 2,234 3,548 6,133 9,370
Selling, General And Administrative Expenses        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total share-based compensation expense $ 2,134 $ 2,773 $ 5,177 $ 6,027