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Intangible Assets - Schedule of Estimated Future Amortization for Intangible Assets (Detail)
$ in Thousands
Sep. 30, 2016
USD ($)
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
2017 $ 3,545
2018 7,233
2019 6,385
2020 6,142
2021 5,919
2022 $ 5,484