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Intangible Assets - Estimated Amortization Expenses of Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Finite Lived Intangible Assets Future Amortization Expense [Abstract]    
2016 $ 1,094  
2017 1,019  
2018 908  
2019 897  
2020 797  
Thereafter 3,946  
Total finite–lived assets $ 8,661 $ 9,972