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Software and Other Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]          
Software, net $ 211,016   $ 211,016   $ 209,507
Software, accumulated amortization 139,500   139,500   121,600
Other intangible assets amortization expense 5,700 $ 5,800 11,500 $ 12,300  
Software Marketed for External Sale [Member]          
Finite-Lived Intangible Assets [Line Items]          
Software, net 78,700   78,700   85,900
Software, amortization expense 3,600 3,600 $ 7,500 7,100  
Software Marketed for External Sale [Member] | Minimum [Member]          
Finite-Lived Intangible Assets [Line Items]          
Estimated useful life     3 years    
Software Marketed for External Sale [Member] | Maximum [Member]          
Finite-Lived Intangible Assets [Line Items]          
Estimated useful life     10 years    
Software Acquired or Developed for Internal Use [Member]          
Finite-Lived Intangible Assets [Line Items]          
Software, net 132,300   $ 132,300   $ 123,600
Software, amortization expense $ 9,100 $ 6,000 $ 17,600 $ 11,200  
Software Acquired or Developed for Internal Use [Member] | Minimum [Member]          
Finite-Lived Intangible Assets [Line Items]          
Estimated useful life     3 years    
Software Acquired or Developed for Internal Use [Member] | Maximum [Member]          
Finite-Lived Intangible Assets [Line Items]          
Estimated useful life     10 years