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Goodwill and Intangible Assets - Estimated Future Amortization Expense for Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]    
2017 $ 15,573  
2018 14,052  
2019 13,713  
2020 12,909  
2021 8,036  
Thereafter 17,560  
Net Book Value $ 81,843 $ 55,446