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Cost of Revenue (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
Component of Operating Other Cost and Expense [Abstract]        
Cost of revenue $ 329,289 $ 297,253 $ 973,729 $ 847,940
Personnel expenses
       
Component of Operating Other Cost and Expense [Abstract]        
Cost of revenue 223,976 203,011 671,518 583,649
Operational expenses
       
Component of Operating Other Cost and Expense [Abstract]        
Cost of revenue 93,235 82,227 265,894 228,256
Depreciation and amortization
       
Component of Operating Other Cost and Expense [Abstract]        
Cost of revenue $ 12,078 $ 12,015 $ 36,317 $ 36,035