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Net Income Per Share - Allocation of Net Income Available to Common Shareholders using Two-Class Method (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Earnings Per Share [Abstract]      
Net income $ 72,652,771us-gaap_ProfitLoss $ 117,526,263us-gaap_ProfitLoss $ 101,346,147us-gaap_ProfitLoss
Net loss attributable to noncontrolling interests (72,220)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest (18,825)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest (98,849)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Change in redeemable amount of noncontrolling interest (434,717)us-gaap_MinorityInterestPeriodIncreaseDecrease 9,644us-gaap_MinorityInterestPeriodIncreaseDecrease 359,398us-gaap_MinorityInterestPeriodIncreaseDecrease
Net income attributable to MercadoLibre, Inc. Shareholders corresponding to common stock, Basic 72,145,834meli_NetIncomeAttributableToCommonStockHoldersBasic 117,517,082meli_NetIncomeAttributableToCommonStockHoldersBasic 101,606,696meli_NetIncomeAttributableToCommonStockHoldersBasic
Net income 72,652,771us-gaap_ProfitLoss 117,526,263us-gaap_ProfitLoss 101,346,147us-gaap_ProfitLoss
Net loss attributable to noncontrolling interests (72,220)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest (18,825)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest (98,849)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Change in redeemable amount of noncontrolling interest (434,717)us-gaap_MinorityInterestPeriodIncreaseDecrease 9,644us-gaap_MinorityInterestPeriodIncreaseDecrease 359,398us-gaap_MinorityInterestPeriodIncreaseDecrease
Net income attributable to MercadoLibre, Inc. Shareholders corresponding to common stock, Diluted $ 72,145,834us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 117,517,082us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 101,606,696us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted