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Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Goodwill And Intangible Assets Disclosure [Abstract]        
Amortization of intangibles $ 901,998 $ 880,605 $ 1,805,090 $ 1,762,701
Indefinite-lived intangible assets other than goodwill     $ 0