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Goodwill and Other Intangible Assets - Estimated Future Amortization Expense (Detail)
$ in Thousands
Sep. 30, 2018
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
2018 (October 1 through December 31) $ 484
2019 1,724
2020 1,701
2021 150
2022 150
2023 38
Total amortization expense $ 4,247