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Goodwill and Other Intangibles - Estimated Amortization Expense of Intangible Assets (Detail)
$ in Thousands
Sep. 30, 2018
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
October - December 2018 $ 3,398
2019 13,429
2020 13,393
2021 12,703
2022 11,232
Thereafter 424,734
Net Balance $ 478,889