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Net Income per Share (Details 1) (USD $)
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Net income per share of common stock    
Basic net income attributable to MercadoLibre, Inc. per common share$ 0.60$ 0.43$ 1.25$ 0.91
Diluted net income attributable to MercadoLibre, Inc. per common share$ 0.60$ 0.43$ 1.25$ 0.91
Numerator:    
Net income attributable to MercadoLibre, Inc   $ 40,081,052
Net income attributable to MercadoLibre, Inc26,295,92518,790,96355,174,38740,085,526
Net income attributable to MercadoLibre, Inc., Diluted$ 26,295,925$ 18,790,963$ 55,174,387$ 40,081,052
Denominator:    
Weighted average of common stock outstanding for Basic earnings per share44,141,92544,129,76244,137,17644,121,539
Adjustment for stock options4,51312,9498,89414,821
Adjustment for shares granted under LTRP4,7808,6564,8028,318
Adjusted weighted average of common stock outstanding for Diluted earnings per share44,151,21844,151,36744,150,87244,144,678