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Net Income Per Share (Net Income (Loss) Per Share of Common Stock) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Net income attributable to MercadoLibre, Inc. per common share        
Net income attributable to MercadoLibre, Inc. per common share, Basic $ 0.44 $ (0.58) $ 0.48 $ 0.11
Net income attributable to MercadoLibre, Inc. per common share, Diluted $ 0.44 $ (0.58) $ 0.48 $ 0.11
Numerator:        
Net income attributable to MercadoLibre, Inc., Basic $ 19,463 $ (25,716) $ 21,184 $ 4,674
Net income attributable to MercadoLibre, Inc., Diluted $ 19,463 $ (25,716) $ 21,184 $ 4,674
Denominator:        
Weighted average of common stock outstanding for Basic earnings per share 44,155,271 44,153,892 44,155,035 44,153,658
Adjustment for Convertible Notes   28,776   14,468
Adjusted weighted average of common stock outstanding for Diluted earnings per share 44,155,271 44,182,668 44,155,035 44,168,126