Annual report pursuant to Section 13 and 15(d)

Acquisitions, Goodwill and Other Intangible Assets - Schedule of Estimated Amortization Expense for Intangible Assets (Detail)

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Acquisitions, Goodwill and Other Intangible Assets - Schedule of Estimated Amortization Expense for Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]      
2019 $ 836    
2020 817    
2021 729    
2022 633    
2023 589    
Thereafter 322    
Total $ 3,926 $ 0 $ 0