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2.25% Convertible Senior Notes Due 2019 (Additional Information) (Details) (USD $)	3 Months Ended		0 Months Ended
	Mar. 31, 2015 item	Mar. 31, 2014	Jun. 30, 2014	Dec. 31, 2014
Debt Instrument [Line Items]
Debt Instrument, convertible maturity start date	Jan. 01, 2019
Debt instrument, convertible trading days	20us-gaap_DebtInstrumentConvertibleThresholdTradingDays
Debt instrument, convertible consecutive trading days	30 days
Payment for capped call transactions	$ 19,668,000us-gaap_PaymentsForHedgeFinancingActivities
Net of deferred income tax effect amounts	6,118,000us-gaap_DeferredIncomeTaxExpenseBenefit	(4,675,000)us-gaap_DeferredIncomeTaxExpenseBenefit
Minimum [Member]
Debt Instrument [Line Items]
Percentage of debt conversion price	130.00%us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger / us-gaap_RangeAxis = us-gaap_MinimumMember
Capped Call Transactions [Member]
Debt Instrument [Line Items]
Strike price, per share	$ 126.02meli_StrikePricePerShare / us-gaap_DebtInstrumentAxis = meli_CappedCallMember
Approximate cap price, per share	$ 155.78meli_CapPricePerShare / us-gaap_DebtInstrumentAxis = meli_CappedCallMember
2.25% Convertible Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Debt instrument, aggregate principal amount	330,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember		330,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember	330,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember
Debt instrument, interest rate			2.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember
Debt instrument, maturity end date			Jul. 01, 2019
Initial conversion rate			7.9353%us-gaap_DebtConversionConvertedInstrumentRate / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember
Debt conversion price per share of common stock			$ 126.02us-gaap_DebtInstrumentConvertibleConversionPrice1 / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember
Proceeds from issuance of convertible debt, net of transaction cost			322,000,000meli_ProceedsFromConvertibleDebtNetOfTransactionCost / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember
Debt Conversion, Converted Instrument, Amount			1,000us-gaap_DebtConversionConvertedInstrumentAmount1 / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember
Net carrying amount	283,015,000us-gaap_DebtLongtermAndShorttermCombinedAmount / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember
Carrying value of the permanent equity component reported in additional paid-in-capital	46,985,000us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember
Effective interest rate after allocation of transaction costs	6.10%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember
Cash flows, discount rate	5.55%us-gaap_FairValueInputsDiscountRate / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember
Deferred tax liabilities, convertible notes	16,445,000us-gaap_DeferredTaxLiabilitiesFinancingArrangements / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember
2.25% Convertible Senior Notes Due 2019 [Member] | Capped Call Transactions [Member]
Debt Instrument [Line Items]
Net proceeds from issuance of convertible debt	321,732,000us-gaap_ProceedsFromConvertibleDebt / us-gaap_DebtInstrumentAxis = meli_CappedCallMember / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember
Transaction costs	8,268,000us-gaap_DebtIssuanceCosts / us-gaap_DebtInstrumentAxis = meli_CappedCallMember / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember
Payment for capped call transactions	19,668,000us-gaap_PaymentsForHedgeFinancingActivities / us-gaap_DebtInstrumentAxis = meli_CappedCallMember / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember
Net of deferred income tax effect amounts	$ 12,784,000us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_DebtInstrumentAxis = meli_CappedCallMember / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember
Measurement Period [Member] | Maximum [Member]
Debt Instrument [Line Items]
Percentage of debt conversion price	98.00%us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger / us-gaap_DebtInstrumentRedemptionPeriodAxis = meli_MeasurementPeriodOneMember / us-gaap_RangeAxis = us-gaap_MaximumMember

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