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Intangible Asset Estimated Amortization Expense (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract]    
2018 $ 646  
2019 646  
2020 646  
2021 646  
2022 646  
Thereafter 4,896  
Intangible asset, net $ 8,126 $ 8,772