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Goodwill and Intangible Assets - Estimated Future Amortization Expense Related to Intangible Assets (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]    
Remainder of 2018 $ 2,833  
2019 3,559  
2020 2,676  
2021 2,380  
2022 2,366  
Thereafter 12,517  
Net Value $ 26,331 $ 4,661