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Goodwill and Identifiable Intangible Assets - Estimated Future Amortization Expense (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2018 $ 10,096
2019 8,599
2020 8,413
2021 8,311
2022 7,761
Thereafter 32,556
Net Carrying Amount $ 75,736