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Goodwill and Intangible Assets - Estimated Future Intangible Asset Amortization Expense (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Sep. 30, 2017
Estimated future intangible asset amortization expense    
2018 (excluding the nine months ended June 30, 2018) $ 1,546  
2018 5,979  
2019 3,648  
2020 2,417  
2021 2,272  
Thereafter 217  
Total $ 16,079 $ 21,185