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Estimated Future Amortization Expense of Other Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]    
2019 $ 7,104  
2020 6,888  
2021 6,888  
2022 5,738  
2023 4,122  
Thereafter 10,227  
Other intangible assets, net $ 40,967 $ 18,395