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Segments (Details 2) (USD $)
Mar. 31, 2012
Dec. 31, 2011
Allocation of the goodwill and intangible assets based on geography    
US intangible assets $ 28,882  
Other countries goodwill and intangible assets 70,533,392 68,588,805
Total goodwill and intangible assets 70,562,274 68,588,805
Argentina [Member]
    
Allocation of the goodwill and intangible assets based on geography    
Other countries goodwill and intangible assets 21,835,253 22,407,558
Brazil [Member]
    
Allocation of the goodwill and intangible assets based on geography    
Other countries goodwill and intangible assets 12,035,958 11,686,315
Mexico [Member]
    
Allocation of the goodwill and intangible assets based on geography    
Other countries goodwill and intangible assets 14,908,278 13,709,353
Venezuela [Member]
    
Allocation of the goodwill and intangible assets based on geography    
Other countries goodwill and intangible assets 6,595,222 6,599,584
Other Countries [Member]
    
Allocation of the goodwill and intangible assets based on geography    
Other countries goodwill and intangible assets $ 15,158,681 $ 14,185,995