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Goodwill and Intangible Assets - Estimated Future Intangible Asset Amortization Expense (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Sep. 30, 2016
Estimated future intangible asset amortization expense    
2017 (excluding the nine months ended June 30, 2017) $ 2,686  
2018 6,448  
2019 5,932  
2020 3,628  
2021 2,408  
Thereafter 2,480  
Total $ 23,582 $ 33,619