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Net Income Per Share - Net Income Per Share of Common Stock (Detail) (USD $)	3 Months Ended												12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income attributable to MercadoLibre, Inc. per common share
Net income attributable to MercadoLibre, Inc. per common share, Basic	$ 0.76us-gaap_EarningsPerShareBasic	$ 0.76us-gaap_EarningsPerShareBasic	$ (0.58)us-gaap_EarningsPerShareBasic	$ 0.69us-gaap_EarningsPerShareBasic	$ 0.93us-gaap_EarningsPerShareBasic	$ 0.66us-gaap_EarningsPerShareBasic	$ 0.67us-gaap_EarningsPerShareBasic	$ 0.40us-gaap_EarningsPerShareBasic	$ 0.69us-gaap_EarningsPerShareBasic	$ 0.59us-gaap_EarningsPerShareBasic	$ 0.57us-gaap_EarningsPerShareBasic	$ 0.45us-gaap_EarningsPerShareBasic	$ 1.63us-gaap_EarningsPerShareBasic	$ 2.66us-gaap_EarningsPerShareBasic	$ 2.30us-gaap_EarningsPerShareBasic
Net income attributable to MercadoLibre, Inc. per common share, Diluted	$ 0.76us-gaap_EarningsPerShareDiluted	$ 0.76us-gaap_EarningsPerShareDiluted	$ (0.58)us-gaap_EarningsPerShareDiluted	$ 0.69us-gaap_EarningsPerShareDiluted	$ 0.93us-gaap_EarningsPerShareDiluted	$ 0.66us-gaap_EarningsPerShareDiluted	$ 0.67us-gaap_EarningsPerShareDiluted	$ 0.40us-gaap_EarningsPerShareDiluted	$ 0.69us-gaap_EarningsPerShareDiluted	$ 0.59us-gaap_EarningsPerShareDiluted	$ 0.57us-gaap_EarningsPerShareDiluted	$ 0.45us-gaap_EarningsPerShareDiluted	$ 1.63us-gaap_EarningsPerShareDiluted	$ 2.66us-gaap_EarningsPerShareDiluted	$ 2.30us-gaap_EarningsPerShareDiluted
Numerator:
Net income attributable to MercadoLibre, Inc., Basic													$ 72,145,834meli_NetIncomeAttributableToCommonStockHoldersBasic	$ 117,517,082meli_NetIncomeAttributableToCommonStockHoldersBasic	$ 101,606,696meli_NetIncomeAttributableToCommonStockHoldersBasic
Net income attributable to MercadoLibre, Inc., Diluted													$ 72,145,834us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted	$ 117,517,082us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted	$ 101,606,696us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Denominator:
Weighted average of common stock outstanding for Basic earnings per share	44,154,412us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	44,153,892us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	44,153,892us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	44,153,818us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	44,153,185us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	44,152,933us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	44,152,933us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	44,151,323us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	44,150,920us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	44,150,387us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	44,147,999us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	44,142,076us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	44,153,884us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	44,152,600us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	44,147,861us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Adjustment for stock options															1,977us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Adjusted weighted average of common stock outstanding for Diluted earnings per share	44,154,412us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	44,153,892us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	44,182,668us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	44,153,818us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	44,153,185us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	44,152,933us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	44,152,933us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	44,151,357us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	44,152,895us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	44,157,321us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	44,152,133us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	44,147,796us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	44,153,884us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	44,152,600us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	44,149,838us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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