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Estimated Amortization Expense for Intangible Assets, by Year (Detail)
$ in Thousands
Dec. 31, 2016
USD ($)
Finite-Lived Intangible Assets [Line Items]  
2017 $ 1,029
2018 1,029
2019 1,029
2020 1,029
2021 1,015
2022 and thereafter 2,034
Finite lived intangibles, net $ 7,165