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Share-Based Compensation Expense (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total share-based compensation expense $ 7,266 $ 7,078 $ 17,199 $ 17,381
Direct Cost Of Revenues
        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total share-based compensation expense 3,742 3,025 10,699 9,408
Selling, General And Administrative Expense
        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total share-based compensation expense 3,524 3,239 6,500 7,159
Special Charges
        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total share-based compensation expense   $ 814   $ 814