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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