Software and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Software, net	$ 155,386	$ 185,496
Software, accumulated amortization	230,700	195,000
Other intangible assets amortization expense	$ 19,400	21,200	$ 23,000
Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	3 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	20 years
Software Marketed for External Sale [Member]
Finite-Lived Intangible Assets [Line Items]
Software, net	$ 40,900	52,300
Software, amortization expense	$ 12,800	13,900	14,500
Software Marketed for External Sale [Member] | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	3 years
Software Marketed for External Sale [Member] | Maximum
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	$ 114,500	133,200
Software, amortization expense	$ 45,200	$ 45,700	$ 38,300
Software Acquired or Developed for Internal Use [Member] | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	3 years
Software Acquired or Developed for Internal Use [Member] | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	10 years