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Intangible Assets - Future Amortization Expenses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]    
2017 $ 5,187  
2018 4,735  
2019 2,178  
2020 2,178  
2021 2,178  
Thereafter 4,251  
Intangible assets, net $ 20,707 $ 26,983