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Intangible assets - Estimated Amortization Expense of Intangible Assets (Detail) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Goodwill And Intangible Assets Disclosure [Abstract]    
2013 (remaining six months) $ 77,524  
2014 154,131  
2015 145,380  
2016 138,309  
2017 134,736  
2018 125,139  
Thereafter 685,170  
Net Carrying Amount $ 1,460,389 $ 1,463,059