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Net Income (Loss) Per Share (Net (Loss) Income Per Share of Common Stock) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Net income attributable to MercadoLibre, Inc. per common share            
Net (loss) income per common share, Basic $ 0.31   $ (0.25)   $ 0.45 $ (0.55)
Net (loss) income per common share, Diluted $ 0.31   $ (0.25)   $ 0.45 $ (0.55)
Numerator:            
Net income (loss) $ 16,217 $ 11,864 $ (11,252) $ (12,919) $ 28,081 $ (24,171)
Amortization of redeemable convertible preferred stock         (5,841)  
Dividends on preferred stock (1,000)       (1,000)  
Net income (loss) corresponding to common stock, Basic 15,217   (11,252)   21,240 (24,171)
Net income (loss) corresponding to common stock, Diluted $ 15,217   $ (11,252)   $ 21,240 $ (24,171)
Denominator:            
Weighted average of common stock outstanding for Basic earnings per share 49,318,522   44,157,364   47,658,610 44,157,364
Adjusted weighted average of common stock outstanding for Diluted earnings per share 49,318,522   44,157,364   47,658,610 44,157,364