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Intangible Assets and Goodwill - Schedule of Expected Future Amortization Expense for Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 $ 3,872  
2019 3,498  
2019 3,122  
2021 2,746  
2022 2,370  
Thereafter 6,315  
Net Carrying Value $ 21,923 $ 26,211