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Software and Other Intangible Assets - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]          
Software, net $ 176,263,000   $ 176,263,000   $ 129,314,000
Software, accumulated amortization 87,200,000   87,200,000    
Other intangible assets amortization expense 4,700,000 3,200,000 13,300,000 8,700,000  
Software Marketed for External Sale
          
Finite-Lived Intangible Assets [Line Items]          
Software, net 96,800,000   96,800,000    
Software, amortization expense 3,400,000 3,800,000 10,100,000 10,000,000  
Software Marketed for External Sale | Minimum
          
Finite-Lived Intangible Assets [Line Items]          
Software estimated useful life     3 years    
Software Marketed for External Sale | Maximum
          
Finite-Lived Intangible Assets [Line Items]          
Software estimated useful life     10 years    
Software Acquired or Developed for Internal Use
          
Finite-Lived Intangible Assets [Line Items]          
Software, net 79,500,000   79,500,000    
Software, amortization expense $ 5,000,000 $ 3,000,000 $ 12,800,000 $ 8,500,000  
Software Acquired or Developed for Internal Use | Minimum
          
Finite-Lived Intangible Assets [Line Items]          
Software estimated useful life     3 years    
Software Acquired or Developed for Internal Use | Maximum
          
Finite-Lived Intangible Assets [Line Items]          
Software estimated useful life     10 years