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Goodwill and Other Intangible Assets - Schedule of Estimated Amortization Expense for Future Years (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]      
2017 remaining $ 2,573    
2018 8,687    
2019 6,737    
2020 4,883    
2021 3,111    
Thereafter 3,244    
Net Carrying Amount $ 29,235 $ 37,677 $ 40,918