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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
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Reconciliation Of Provision Of Income Taxes [Line Items] |  |  |
Net income before income tax | $ 121,795,821 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ 163,109,444 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ 140,217,526 us-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 | 40,783,129 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 55,241,195 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 46,593,938 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Permanent differences: |  |  |
Federal and assets taxes | 3,527 meli_IncomeTaxReconciliationFederalAndAssetsTaxes |  |
Transfer Pricing | 616,101 meli_IncomeTaxReconciliationTransferPricing |  |
Non-deductible tax | 258,153 meli_IncomeTaxReconciliationNonDeductibleTax |  |
Non-deductible expenses | 2,310,535 us-gaap_IncomeTaxReconciliationNondeductibleExpense | 1,777,180 us-gaap_IncomeTaxReconciliationNondeductibleExpense | 1,657,662 us-gaap_IncomeTaxReconciliationNondeductibleExpense
Dividend distributions | 4,221,176 us-gaap_IncomeTaxReconciliationDeductionsDividends | 1,414,915 us-gaap_IncomeTaxReconciliationDeductionsDividends | 847,798 us-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 | 1,094,214 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 736,910 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 572,790 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Business Combination | (40,469)meli_IncomeTaxReconciliationBusinessCombination | 34,706 meli_IncomeTaxReconciliationBusinessCombination |
True up | (55,081)meli_IncomeTaxReconciliationTrueUp | 43,312 meli_IncomeTaxReconciliationTrueUp | 177,302 meli_IncomeTaxReconciliationTrueUp
Income tax expense | 49,143,050 meli_CurrentAndDeferredTaxExpenseBenefit | 45,374,259 meli_CurrentAndDeferredTaxExpenseBenefit | 38,783,682 meli_CurrentAndDeferredTaxExpenseBenefit
Venezuelan Operations [Member] |  |  |
Permanent differences: |  |  |
Impairment of long-lived assets | $ 14,734,001 us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses / dei_LegalEntityAxis = meli_VenezuelanSubsidiaryMember |  |

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