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Goodwill and Intangible Assets - Summary of Estimated Amortization Expense for Future Years (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]  
For the three months ending December 31, 2013 $ 8,119
For the year ended December 31, 2014 32,477
For the year ended December 31, 2015 31,780
For the year ended December 31, 2016 31,082
For the year ended December 31, 2017 $ 31,082