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Goodwill and Intangible Assets - Estimated Annual Amortization Expense (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2017 $ 2,804  
2018 2,240  
2019 1,712  
2020 1,057  
2021 and thereafter 565  
Total $ 8,378 $ 11,990