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Intangible Assets and Goodwill - Estimated Amortization of Intangible Assets (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
2019 $ 3,056
2020 2,975
2021 2,246
2022 1,935
2023 $ 1,811