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Segments - Financial Performance of Company's Reporting Segments (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
Segment Reporting Information [Line Items]
Net revenues	$ 161,369,649us-gaap_SalesRevenueServicesNet	$ 147,934,895us-gaap_SalesRevenueServicesNet	$ 131,849,139us-gaap_SalesRevenueServicesNet	$ 115,382,319us-gaap_SalesRevenueServicesNet	$ 134,630,171us-gaap_SalesRevenueServicesNet	$ 123,055,431us-gaap_SalesRevenueServicesNet	$ 112,183,360us-gaap_SalesRevenueServicesNet	$ 102,725,747us-gaap_SalesRevenueServicesNet	$ 103,754,645us-gaap_SalesRevenueServicesNet	$ 97,266,784us-gaap_SalesRevenueServicesNet	$ 88,844,059us-gaap_SalesRevenueServicesNet	$ 83,736,006us-gaap_SalesRevenueServicesNet	$ 556,536,002us-gaap_SalesRevenueServicesNet	$ 472,594,709us-gaap_SalesRevenueServicesNet	$ 373,601,494us-gaap_SalesRevenueServicesNet
Direct costs													(300,500,733)us-gaap_DirectOperatingCosts	(246,391,578)us-gaap_DirectOperatingCosts	(190,483,230)us-gaap_DirectOperatingCosts
Impairment of Long-Lived Assets			(49,495,686)us-gaap_AssetImpairmentCharges										(49,495,686)us-gaap_AssetImpairmentCharges
Direct contribution													206,539,583meli_DirectContribution	226,203,131meli_DirectContribution	183,118,264meli_DirectContribution
Operating expenses and indirect costs of net revenues													(86,068,720)meli_OperatingExpensesAndIndirectCostsOfNetRevenues	(72,664,076)meli_OperatingExpensesAndIndirectCostsOfNetRevenues	(53,460,393)meli_OperatingExpensesAndIndirectCostsOfNetRevenues
Income from operations													120,470,863us-gaap_OperatingIncomeLoss	153,539,055us-gaap_OperatingIncomeLoss	129,657,871us-gaap_OperatingIncomeLoss
Other income (expenses):
Interest income and other financial gains													15,335,853us-gaap_InvestmentIncomeInterest	10,668,593us-gaap_InvestmentIncomeInterest	11,877,375us-gaap_InvestmentIncomeInterest
Interest expense and other financial losses													(11,659,356)meli_InterestExpenseAndOtherFinancialCharges	(2,355,929)meli_InterestExpenseAndOtherFinancialCharges	(1,138,379)meli_InterestExpenseAndOtherFinancialCharges
Foreign currency gains (loss)													(2,351,539)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax	1,258,476us-gaap_ForeignCurrencyTransactionGainLossBeforeTax	11,597us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Other losses, net														(751)us-gaap_OtherNonoperatingIncomeExpense	(190,938)us-gaap_OtherNonoperatingIncomeExpense
Net income before income / asset tax expense													121,795,821us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	163,109,444us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	140,217,526us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Brazil [Member]
Segment Reporting Information [Line Items]
Net revenues													273,638,197us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_BR	206,394,480us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_BR	179,639,592us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_BR
Direct costs													(158,412,078)us-gaap_DirectOperatingCosts / us-gaap_StatementGeographicalAxis = country_BR	(119,422,924)us-gaap_DirectOperatingCosts / us-gaap_StatementGeographicalAxis = country_BR	(104,501,652)us-gaap_DirectOperatingCosts / us-gaap_StatementGeographicalAxis = country_BR
Direct contribution													115,226,119meli_DirectContribution / us-gaap_StatementGeographicalAxis = country_BR	86,971,556meli_DirectContribution / us-gaap_StatementGeographicalAxis = country_BR	75,137,940meli_DirectContribution / us-gaap_StatementGeographicalAxis = country_BR
Argentina [Member]
Segment Reporting Information [Line Items]
Net revenues													150,667,541us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_AR	122,123,347us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_AR	88,513,640us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_AR
Direct costs													(81,273,193)us-gaap_DirectOperatingCosts / us-gaap_StatementGeographicalAxis = country_AR	(66,492,770)us-gaap_DirectOperatingCosts / us-gaap_StatementGeographicalAxis = country_AR	(41,841,587)us-gaap_DirectOperatingCosts / us-gaap_StatementGeographicalAxis = country_AR
Direct contribution													69,394,348meli_DirectContribution / us-gaap_StatementGeographicalAxis = country_AR	55,630,577meli_DirectContribution / us-gaap_StatementGeographicalAxis = country_AR	46,672,053meli_DirectContribution / us-gaap_StatementGeographicalAxis = country_AR
Mexico [Member]
Segment Reporting Information [Line Items]
Net revenues													37,668,802us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_MX	32,843,482us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_MX	26,987,130us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_MX
Direct costs													(24,067,532)us-gaap_DirectOperatingCosts / us-gaap_StatementGeographicalAxis = country_MX	(18,558,010)us-gaap_DirectOperatingCosts / us-gaap_StatementGeographicalAxis = country_MX	(14,912,375)us-gaap_DirectOperatingCosts / us-gaap_StatementGeographicalAxis = country_MX
Direct contribution													13,601,270meli_DirectContribution / us-gaap_StatementGeographicalAxis = country_MX	14,285,472meli_DirectContribution / us-gaap_StatementGeographicalAxis = country_MX	12,074,755meli_DirectContribution / us-gaap_StatementGeographicalAxis = country_MX
Venezuela [Member]
Segment Reporting Information [Line Items]
Net revenues													58,025,886us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_VE	84,572,485us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_VE	54,676,170us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_VE
Direct costs													(16,584,667)us-gaap_DirectOperatingCosts / us-gaap_StatementGeographicalAxis = country_VE	(29,578,762)us-gaap_DirectOperatingCosts / us-gaap_StatementGeographicalAxis = country_VE	(17,768,989)us-gaap_DirectOperatingCosts / us-gaap_StatementGeographicalAxis = country_VE
Impairment of Long-Lived Assets													(49,495,686)us-gaap_AssetImpairmentCharges / us-gaap_StatementGeographicalAxis = country_VE
Direct contribution													(8,054,467)meli_DirectContribution / us-gaap_StatementGeographicalAxis = country_VE	54,993,723meli_DirectContribution / us-gaap_StatementGeographicalAxis = country_VE	36,907,181meli_DirectContribution / us-gaap_StatementGeographicalAxis = country_VE
Other Countries [Member]
Segment Reporting Information [Line Items]
Net revenues													36,535,576us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = meli_OtherCountriesMember	26,660,915us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = meli_OtherCountriesMember	23,784,962us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = meli_OtherCountriesMember
Direct costs													(20,163,263)us-gaap_DirectOperatingCosts / us-gaap_StatementGeographicalAxis = meli_OtherCountriesMember	(12,339,112)us-gaap_DirectOperatingCosts / us-gaap_StatementGeographicalAxis = meli_OtherCountriesMember	(11,458,627)us-gaap_DirectOperatingCosts / us-gaap_StatementGeographicalAxis = meli_OtherCountriesMember
Direct contribution													$ 16,372,313meli_DirectContribution / us-gaap_StatementGeographicalAxis = meli_OtherCountriesMember	$ 14,321,803meli_DirectContribution / us-gaap_StatementGeographicalAxis = meli_OtherCountriesMember	$ 12,326,335meli_DirectContribution / us-gaap_StatementGeographicalAxis = meli_OtherCountriesMember

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