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Goodwill and Intangible Assets - Total Estimated Annual Future Amortization Expense for the Acquired Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 $ 6,379  
2019 6,265  
2020 3,869  
2021 3,389  
2022 2,116  
Thereafter 2,436  
Total $ 24,454 $ 20,954