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Goodwill and Intangible Assets - Estimated Future Intangible Asset Amortization Expense (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Sep. 30, 2017
Estimated future intangible asset amortization expense    
2018 (excluding the quarter ended December 31, 2017) $ 4,803  
2018 6,085  
2019 3,689  
2020 2,433  
2021 2,287  
Thereafter 217  
Total $ 19,514 $ 21,185