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Goodwill and Intangible Assets - Schedule of Future Amortization Related to Company's Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract]    
2018 $ 4,296  
2019 3,735  
2020 3,178  
2021 2,617  
2022 2,059  
Thereafter 3,767  
Finite-Lived Intangible Assets, Net Carrying Amount $ 19,652 $ 17,721