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Goodwill and Other Intangible Assets - Schedule of Indefinite-Lived Intangible Assets (Detail) - USD ($)
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Indefinite lived intangible asset:    
Goodwill Useful Life Description Indefinite  
Goodwill $ 58,337,290 $ 58,337,290