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Net Income Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Net income attributable to MercadoLibre, Inc. per common share    
Net income attributable to MercadoLibre, Inc. Shareholders per common share, Basic $ 0.68 $ 0.04
Net income attributable to MercadoLibre, Inc. Shareholders per common share, Diluted $ 0.68 $ 0.04
Numerator:    
Net income attributable to MercadoLibre, Inc. Shareholders, Basic $ 30,247 $ 1,721
Net income attributable to MercadoLibre, Inc. Shareholders, Diluted $ 30,247 $ 1,721
Denominator:    
Weighted average of common stock outstanding for Basic earnings per share 44,156,961 44,154,796
Adjusted weighted average of common stock outstanding for Diluted earnings per share 44,156,961 44,154,796