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Software and Other Intangible Assets - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]          
Software, net $ 207,683,000   $ 207,683,000   $ 191,468,000
Software, accumulated amortization 119,900,000   119,900,000   95,300,000
Other intangible assets amortization expense 6,100,000 4,700,000 18,400,000 13,300,000  
Software Marketed for External Sale
          
Finite-Lived Intangible Assets [Line Items]          
Software, net 88,800,000   88,800,000   94,000,000
Software, amortization expense 3,800,000 3,400,000 10,900,000 10,100,000  
Software Marketed for External Sale | Minimum
          
Finite-Lived Intangible Assets [Line Items]          
Estimated useful life     3 years    
Software Marketed for External Sale | Maximum
          
Finite-Lived Intangible Assets [Line Items]          
Estimated useful life     10 years    
Software Acquired or Developed for Internal Use
          
Finite-Lived Intangible Assets [Line Items]          
Software, net 118,900,000   118,900,000   97,500,000
Software, amortization expense $ 7,700,000 $ 5,000,000 $ 18,900,000 $ 12,800,000  
Software Acquired or Developed for Internal Use | Minimum
          
Finite-Lived Intangible Assets [Line Items]          
Estimated useful life     3 years    
Software Acquired or Developed for Internal Use | Maximum
          
Finite-Lived Intangible Assets [Line Items]          
Estimated useful life     10 years