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Software and Other Intangible Assets - Estimated Amortization Expense for Future Fiscal Years Based on Capitalized Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Net Balance $ 174,057 $ 191,281
Software [Member]    
Finite-Lived Intangible Assets [Line Items]    
Remainder of 2018 13,724  
2019 47,416  
2020 37,964  
2021 24,930  
2022 11,957  
2023 6,306  
Thereafter 5,019  
Net Balance 147,316  
Other Intangible Assets [Member]    
Finite-Lived Intangible Assets [Line Items]    
Remainder of 2018 4,670  
2019 18,325  
2020 17,438  
2021 16,939  
2022 16,789  
2023 16,478  
Thereafter 83,418  
Net Balance $ 174,057