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Goodwill and Intangible Assets - Estimated Future Intangible Asset Amortization Expense (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Sep. 30, 2016
Estimated future intangible asset amortization expense    
2017 (excluding the six months ended March 31, 2017) $ 5,923  
2018 6,254  
2019 5,741  
2020 3,555  
2021 2,382  
Thereafter 2,456  
Total $ 26,311 $ 33,619