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Intangible Assets and Goodwill - Estimated Amortization of Intangible Assets (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
2018 $ 2,208
2019 2,208
2020 2,096
2021 1,265
2022 $ 950