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Goodwill and Other Intangible Assets - Schedule of Amortization Expense of FInite-Lived Intangible Assets Expected to be Recognized (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2017 $ 7,281  
2018 7,274  
2019 7,044  
2020 5,759  
2021 3,301  
Thereafter 7,220  
Net Carrying Value $ 37,879 $ 39,747