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Goodwill and Identifiable Intangible Assets - Estimated Future Amortization Expense (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2019 $ 8,501
2020 8,434
2021 8,110
2022 7,554
2023 7,293
Thereafter 20,689
Net Carrying Amount $ 60,581