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Other Intangible Assets - Schedule Estimated Aggregate Future Amortization Expenses for Other Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 $ 5,157  
2019 5,157  
2020 4,547  
2021 4,500  
2022 4,500  
Thereafter 17,999  
Intangible Assets, net $ 41,860 $ 2,285