Software and Other Intangible Assets - Estimated Amortization Expense for Future Fiscal Years Based on Capitalized Intangible Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Net Balance	$ 188,688	$ 191,281
Software [Member]
Finite-Lived Intangible Assets [Line Items]
Remainder of 2018	38,406
2019	42,955
2020	33,127
2021	20,461
2022	8,780
2023	4,640
Thereafter	2,284
Net Balance	150,653
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Remainder of 2018	14,410
2019	18,777
2020	17,866
2021	17,342
2022	17,184
2023	16,854
Thereafter	86,255
Net Balance	$ 188,688