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Business combinations, Goodwill and Intangible assets - Composition of Goodwill and Intangible Assets (Detail) (USD $)
Jun. 30, 2013
Mar. 22, 2013
Dec. 31, 2012
Dec. 31, 2011
Indefinite-lived Intangible Assets [Line Items]        
Goodwill $ 59,558,023 $ 2,668,661 $ 60,366,063 $ 62,093,948
Total intangible assets 11,520,494   12,060,004  
Accumulated amortization (4,802,728)   (4,780,139)  
Total intangible assets, net 6,717,766   7,279,865  
Licenses and Others [Member]
        
Indefinite-lived Intangible Assets [Line Items]        
Finite-Lived Intangible Assets, Gross 3,563,361   3,829,668  
Non-Compete Agreement [Member]
        
Indefinite-lived Intangible Assets [Line Items]        
Finite-Lived Intangible Assets, Gross 1,105,573   1,195,509  
Customer List [Member]
        
Indefinite-lived Intangible Assets [Line Items]        
Finite-Lived Intangible Assets, Gross 1,600,514   1,708,770  
Trademarks [Member]
        
Indefinite-lived Intangible Assets [Line Items]        
Trademarks $ 5,251,046   $ 5,326,057