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Net Income Per Share - Net Income Per Share of Common Stock (Detail) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Net income attributable to MercadoLibre, Inc. per common share    
Net income attributable to MercadoLibre, Inc. per common share, Basic $ 0.69 $ 0.40
Net income attributable to MercadoLibre, Inc. per common share, Diluted $ 0.69 $ 0.40
Numerator:    
Net income attributable to MercadoLibre, Inc., Basic $ 30,324,652 $ 17,696,213
Net income attributable to MercadoLibre, Inc., Diluted $ 30,324,652 $ 17,696,213
Denominator:    
Weighted average of common stock outstanding for Basic earnings per share 44,153,818 44,151,323
Weighted average of common stock outstanding for Diluted earnings per share 44,153,818 44,151,323
Adjustment for stock options   34
Adjusted weighted average of common stock outstanding for Diluted earnings per share 44,153,818 44,151,357