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Goodwill and Intangible Assets - Estimated Future Amortization Expense for Intangible Assets (Detail) (USD $)
Sep. 30, 2013
Sep. 30, 2012
Goodwill and Intangible Assets Disclosure [Abstract]    
2013 $ 10,100,000  
2014 9,400,000  
2015 8,700,000  
2016 8,000,000  
2017 6,100,000  
Thereafter 17,800,000  
Net Book Value $ 60,088,000 $ 39,400,000