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Intangible Assets and Goodwill - Estimated Amortization of Intangible Assets (Detail)
$ in Thousands
Dec. 31, 2016
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
2017 $ 2,213
2018 2,213
2019 2,213
2020 2,101
2021 $ 1,270