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Share-Based Compensation Expense (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total share-based compensation expense $ 5,421 $ 6,654 $ 22,620 $ 24,035
Direct Cost Of Revenues
        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total share-based compensation expense 2,532 3,475 13,231 12,883
Selling, General And Administrative Expense
        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total share-based compensation expense 2,680 3,179 9,180 10,338
Special Charges
        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total share-based compensation expense $ 209   $ 209 $ 814