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Income Taxes - Reconciliation of Difference Between Actual Provision for Income Taxes and Provision Computed by Applying Income Tax Rate (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation Of Provision Of Income Taxes [Line Items]
Net income before income tax	$ 121,795,821us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	$ 163,109,444us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	$ 140,217,526us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Weighted average income tax rate	33.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	33.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Income tax expense at blended tax rate	40,783,129us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	55,241,195us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	46,593,938us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Permanent differences:
Federal and assets taxes	3,527meli_IncomeTaxReconciliationFederalAndAssetsTaxes
Transfer Pricing	616,101meli_IncomeTaxReconciliationTransferPricing
Non-deductible tax	258,153meli_IncomeTaxReconciliationNonDeductibleTax
Non-deductible expenses	2,310,535us-gaap_IncomeTaxReconciliationNondeductibleExpense	1,777,180us-gaap_IncomeTaxReconciliationNondeductibleExpense	1,657,662us-gaap_IncomeTaxReconciliationNondeductibleExpense
Dividend distributions	4,221,176us-gaap_IncomeTaxReconciliationDeductionsDividends	1,414,915us-gaap_IncomeTaxReconciliationDeductionsDividends	847,798us-gaap_IncomeTaxReconciliationDeductionsDividends
Non-taxable income	(9,564,540)us-gaap_IncomeTaxReconciliationTaxExemptIncome	(12,321,790)us-gaap_IncomeTaxReconciliationTaxExemptIncome	(9,852,468)us-gaap_IncomeTaxReconciliationTaxExemptIncome
Currency translation	(5,217,696)meli_IncomeTaxReconciliationCurrencyTranslation	(1,552,169)meli_IncomeTaxReconciliationCurrencyTranslation	(1,213,340)meli_IncomeTaxReconciliationCurrencyTranslation
Change in valuation allowance	1,094,214us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	736,910us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	572,790us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Business Combination	(40,469)meli_IncomeTaxReconciliationBusinessCombination	34,706meli_IncomeTaxReconciliationBusinessCombination
True up	(55,081)meli_IncomeTaxReconciliationTrueUp	43,312meli_IncomeTaxReconciliationTrueUp	177,302meli_IncomeTaxReconciliationTrueUp
Income tax expense	49,143,050meli_CurrentAndDeferredTaxExpenseBenefit	45,374,259meli_CurrentAndDeferredTaxExpenseBenefit	38,783,682meli_CurrentAndDeferredTaxExpenseBenefit
Venezuelan Operations [Member]
Permanent differences:
Impairment of long-lived assets	$ 14,734,001us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses / dei_LegalEntityAxis = meli_VenezuelanSubsidiaryMember

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