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Net Income per Share (Details 1) (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Net income attributable to MercadoLibre, Inc per common share    
Basic net income attributable to MercadoLibre, Inc. per common share $ 0.45 $ 0.32
Diluted net income attributable to MercadoLibre, Inc. per common share $ 0.45 $ 0.32
Numerator:    
Net income attributable to MercadoLibre, Inc., Basic $ 19,950,908 $ 14,057,634
Net income attributable to MercadoLibre, Inc., Diluted $ 19,950,908 $ 14,057,634
Denominator:    
Weighted average of common stock outstanding for Basic earnings per share 44,142,076 44,131,383
Adjustment for stock options 5,720 11,474
Adjustment for shares granted under LTRP   4,810
Adjusted weighted average of common stock outstanding for Diluted earnings per share 44,147,796 44,147,667