Software and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Software, net	$ 202,242		$ 202,242		$ 209,507
Software, accumulated amortization	149,700		149,700		121,600
Other intangible assets amortization expense	5,600	$ 6,100	17,100	$ 18,400
Software Marketed for External Sale [Member]
Finite-Lived Intangible Assets [Line Items]
Software, net	74,300		74,300		85,900
Software, amortization expense	3,400	3,800	$ 10,900	10,900
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	127,900		$ 127,900		$ 123,600
Software, amortization expense	$ 9,400	$ 7,700	$ 27,000	$ 18,900
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