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Goodwill and Intangible Assets - Estimated Future Intangible Asset Amortization Expense (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Sep. 30, 2016
Estimated future intangible asset amortization expense    
2017 (excluding the quarter ended December 31, 2016) $ 9,146  
2018 6,174  
2019 5,662  
2020 3,527  
2021 2,372  
Thereafter 2,447  
Total $ 29,328 $ 33,619