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Balance sheet components - Reclassifications Out of Accumulated Other Comprehensive Income (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
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gains on investments													$ 15,335,853us-gaap_InvestmentIncomeInterest	$ 10,668,593us-gaap_InvestmentIncomeInterest	$ 11,877,375us-gaap_InvestmentIncomeInterest
Estimated tax loss on unrealized gains on investments													(49,143,050)us-gaap_IncomeTaxExpenseBenefit	(45,583,181)us-gaap_IncomeTaxExpenseBenefit	(38,871,379)us-gaap_IncomeTaxExpenseBenefit
Net income attributable to MercadoLibre, Inc. shareholders	34,161,329us-gaap_NetIncomeLoss	33,751,967us-gaap_NetIncomeLoss	(25,588,478)us-gaap_NetIncomeLoss	30,327,953us-gaap_NetIncomeLoss	40,836,407us-gaap_NetIncomeLoss	29,146,247us-gaap_NetIncomeLoss	30,021,018us-gaap_NetIncomeLoss	17,522,591us-gaap_NetIncomeLoss	30,246,388us-gaap_NetIncomeLoss	26,067,897us-gaap_NetIncomeLoss	25,394,824us-gaap_NetIncomeLoss	19,637,038us-gaap_NetIncomeLoss	72,580,551us-gaap_NetIncomeLoss	117,507,438us-gaap_NetIncomeLoss	101,247,298us-gaap_NetIncomeLoss
Unrealized Gains (Losses) on Investments [Member] \| Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gains on investments													36,626
Estimated tax loss on unrealized gains on investments													(11,159)
Net income attributable to MercadoLibre, Inc. shareholders													$ 25,467

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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