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Goodwill and Other Intangible Assets - Estimated Amortization Expense (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2018 $ 25,531
2019 18,657
2020 10,301
2021 3,718
2022 1,004
2023 and thereafter $ 215