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Net Income Per Share (Net Income (Loss) Per Share of Common Stock) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Net income attributable to MercadoLibre, Inc. per common share    
Net income attributable to MercadoLibre, Inc. per common share, Basic $ 0.04us-gaap_EarningsPerShareBasic $ 0.69us-gaap_EarningsPerShareBasic
Net income attributable to MercadoLibre, Inc. per common share, Diluted $ 0.04us-gaap_EarningsPerShareDiluted $ 0.69us-gaap_EarningsPerShareDiluted
Numerator:    
Net income attributable to MercadoLibre, Inc., Basic $ 1,721us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 30,325us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net income attributable to MercadoLibre, Inc., Diluted $ 1,721us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 30,325us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Denominator:    
Weighted average of common stock outstanding for Basic earnings per share 44,154,796us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 44,153,818us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Adjustment for Convertible Notes      
Adjusted weighted average of common stock outstanding for Diluted earnings per share 44,154,796us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 44,153,818us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding