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Net Income Per Share - Net Income (Loss) Per Share of Common Stock (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Net (loss) income attributable to MercadoLibre, Inc. per common share        
Net (loss) income attributable to MercadoLibre, Inc. per common share, Basic $ (0.58) $ 0.67 $ 0.11 $ 1.07
Net (loss) income attributable to MercadoLibre, Inc. per common share, Diluted $ (0.58) $ 0.67 $ 0.11 $ 1.07
Numerator:        
Net (loss) income attributable to MercadoLibre, Inc., Basic $ (25,715,076) $ 29,628,730 $ 4,673,558 $ 47,324,943
Net (loss) income attributable to MercadoLibre, Inc., Diluted $ (25,715,076) $ 29,628,730 $ 4,673,558 $ 47,324,943
Denominator:        
Weighted average of common stock outstanding for Basic earnings per share 44,153,892 44,152,933 44,153,658 44,152,132
Adjustment for Convertible Notes 28,776   14,468  
Adjusted weighted average of common stock outstanding for Diluted earnings per share 44,182,668 44,152,933 44,168,126 44,152,132