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Business Combinations, Goodwill and Intangible Assets - Composition of Goodwill and Intangible Assets (Detail) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Mar. 22, 2013
Dec. 31, 2012
Indefinite-lived Intangible Assets [Line Items]        
Goodwill $ 51,959,430 $ 55,101,218 $ 2,668,661 $ 60,366,063
Total intangible assets 10,768,347 11,261,888    
Accumulated amortization (4,374,743) (4,670,303)    
Total intangible assets, net 6,393,604 6,591,585    
Licenses and Others [Member]
        
Indefinite-lived Intangible Assets [Line Items]        
Finite-Lived Intangible Assets, Gross 3,080,543 3,430,003    
Non-Compete Agreement [Member]
        
Indefinite-lived Intangible Assets [Line Items]        
Finite-Lived Intangible Assets, Gross 979,402 1,025,605    
Customer Lists [Member]
        
Indefinite-lived Intangible Assets [Line Items]        
Finite-Lived Intangible Assets, Gross 1,484,131 1,568,190    
Trademarks [Member]
        
Indefinite-lived Intangible Assets [Line Items]        
Trademarks $ 5,224,271 $ 5,238,090