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Intangible Assets Estimated Amortization Expense (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]    
2016 $ 646  
2017 646  
2018 646  
2019 646  
2020 646  
Thereafter 6,187  
Net $ 9,417 $ 10,063