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Goodwill and Other Intangible Assets - Estimated Amortization Expense of Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]    
2019 $ 13,203  
2020 13,168  
2021 12,462  
2022 11,036  
2023 10,592  
Thereafter 411,094  
Net Balance $ 471,555 $ 472,472