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Schedule of Share-based Compensation Expense (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total share-based compensation expense $ 3,806 $ 5,421 $ 19,203 $ 22,620
Direct Cost Of Revenues
       
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total share-based compensation expense 2,654 2,532 12,024 13,231
Selling, General And Administrative Expense
       
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total share-based compensation expense 2,146 2,680 8,173 9,180
Special Charges
       
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Share-based compensation expense net of forfeitures $ (994) [1] $ 209 [1] $ (994) [1] $ 209 [1]
[1] Special charges of $0.2 million equity award expense acceleration are net of forfeitures of $1.2 million for the three and nine months ended September 30, 2014.