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Goodwill and Intangible Assets - Finite-lived Intangible Assets Amortization Expense (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 $ 2,658  
2019 2,658  
2020 2,658  
2021 2,658  
2022 2,658  
Thereafter 13,314  
Amortized intangible assets, Net $ 26,604 $ 29,912