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Goodwill and Intangible Assets - Estimated Future Intangible Asset Amortization Expense (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Sep. 30, 2018
Estimated future intangible asset amortization expense    
2019 (excluding the quarter ended December 31, 2018) $ 4,427  
2020 3,618  
2021 2,396  
2022 2,252  
2023 217  
Total $ 12,910 $ 14,536