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Intangible Assets - Estimated Amortization Expense (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract]    
2018 $ 5,685  
2019 5,680  
2020 5,671  
2021 5,671  
2022 5,671  
Thereafter 45,787  
Total $ 74,165 $ 77,064