Quarterly report pursuant to Section 13 or 15(d)

Amortizable Intangible Assets - Amortizable Intangible Assets, Estimate Amortization Expense (Detail)

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Amortizable Intangible Assets - Amortizable Intangible Assets, Estimate Amortization Expense (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 (Oct - Dec) $ 1,635  
2019 4,699  
2020 3,275  
2021 1,654  
2022 969  
Thereafter 667  
Net $ 12,899 $ 13,104