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Net Income Per Share (Allocation of Net Income Available to Common Shareholders using Two-Class Method) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Net Income Per Share [Abstract]        
Net income (loss) $ 19,463 $ (25,589) $ 21,184 $ 4,740
Net (income) loss attributable to noncontrolling interests   (6)   (70)
Change in redeemable amount of noncontrolling interest   (121)   4
Net income attributable to MercadoLibre, Inc. Shareholders corresponding to common stock, Basic 19,463 (25,716) 21,184 4,674
Net income attributable to MercadoLibre, Inc. Shareholders corresponding to common stock, Diluted $ 19,463 $ (25,716) $ 21,184 $ 4,674