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Net Income per Share - Net Income Per Share of Common Stock (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Net income attributable to MercadoLibre, Inc. per common share        
Net income attributable to MercadoLibre, Inc. per common share, Basic $ 0.67 $ 0.57 $ 1.07 $ 1.02
Net income attributable to MercadoLibre, Inc. per common share, Diluted $ 0.67 $ 0.57 $ 1.07 $ 1.02
Numerator:        
Net income attributable to MercadoLibre, Inc., Basic $ 29,628,730 $ 25,200,094 $ 47,324,943 $ 45,151,002
Net income attributable to MercadoLibre, Inc., Diluted $ 29,628,730 $ 25,200,094 $ 47,324,943 $ 45,151,002
Denominator:        
Weighted average of common stock outstanding for Basic earnings per share 44,152,933 44,147,999 44,152,132 44,145,038
Weighted average of common stock outstanding for Diluted earnings per share 44,152,933 44,147,999 44,152,132 44,145,038
Adjustment for stock options   4,134   4,140
Adjusted weighted average of common stock outstanding for Diluted earnings per share 44,152,933 44,152,133 44,152,132 44,149,178