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Summary of Significant Accounting Policies (Additional Information) (Details)
 1 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 3 Months Ended
Jan. 31, 2014
ARS
Mar. 31, 2015
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Mar. 31, 2015
ARS
Mar. 31, 2015
VEF
Feb. 10, 2015
VEF
Dec. 31, 2014
USD ($)
Dec. 31, 2013
ARS
Jun. 30, 2014
SICAD 2 [Member]
USD ($)
Mar. 31, 2015
Venezuelan Operations [Member]
USD ($)
Jun. 30, 2014
Venezuelan Operations [Member]
item
Mar. 31, 2015
Capped Call Transactions [Member]
USD ($)
Jun. 30, 2014
2.25% Convertible Senior Notes Due 2019 [Member]
USD ($)
Mar. 31, 2015
2.25% Convertible Senior Notes Due 2019 [Member]
USD ($)
Dec. 31, 2014
2.25% Convertible Senior Notes Due 2019 [Member]
USD ($)
Jun. 30, 2014
2.25% Convertible Senior Notes Due 2019 [Member]
USD ($)
Mar. 31, 2015
2.25% Convertible Senior Notes Due 2019 [Member]
Capped Call Transactions [Member]
USD ($)
Significant Accounting Policies [Line Items]                                    
Percentage of revenues and operating costs generated in foreign operations   99.70%meli_RevenuesAndOperatingCostsGeneratedInForeignOperations   99.40%meli_RevenuesAndOperatingCostsGeneratedInForeignOperations                            
Long-lived assets and goodwill located in the foreign operations   $ 152,736,000meli_OtherCountriesLongLivedTangibleAndIntangibleAssets           $ 170,147,000meli_OtherCountriesLongLivedTangibleAndIntangibleAssets                    
Exchange rate used to re-measure transactions 8.0meli_ForeignCurrencyExchangeRateRemeasuringTransactions       8.82meli_ForeignCurrencyExchangeRateRemeasuringTransactions 192.95meli_ForeignCurrencyExchangeRateRemeasuringTransactions 12meli_ForeignCurrencyExchangeRateRemeasuringTransactions   6.52meli_ForeignCurrencyExchangeRateRemeasuringTransactions                  
Foreign exchange loss   20,400,000meli_ForeignCurrencyExchangeGainLoss 16,500,000meli_ForeignCurrencyExchangeGainLoss                              
Number of office spaces owned                       2meli_NumberOfOfficePropertiesOwned
/ us-gaap_StatementBusinessSegmentsAxis
= meli_VenezuelanSubsidiaryMember		            
Fair value of real estate properties                     9,200,000us-gaap_AssetsHeldForSaleLongLivedFairValueDisclosure
/ us-gaap_StatementBusinessSegmentsAxis
= meli_VenezuelanSubsidiaryMember		              
Impairment of Long lived assets   16,226,000us-gaap_AssetImpairmentCharges               49,500,000us-gaap_AssetImpairmentCharges
/ us-gaap_StatementScenarioAxis
= meli_SicadTwoMember		 16,200,000us-gaap_AssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= meli_VenezuelanSubsidiaryMember		              
Percentage of consolidated net assets                     0.90%meli_NetAssetsOfAsPercentageOfConsolidatedNetAssets
/ us-gaap_StatementBusinessSegmentsAxis
= meli_VenezuelanSubsidiaryMember		              
Percentage of consolidated cash and investments                     1.30%meli_NetCashAndInvestmentsOfSubsidiariesAsPercentageOfCashAndInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= meli_VenezuelanSubsidiaryMember		              
Percentage of increase in exchange ratio 23.00%meli_PercentageOfIncreaseInExchangeRatio                                  
Net assets decreased       14,625meli_ChangeInEquityMethodInvestmentForeignCurrencyTranslation                            
Recognize foreign currency gain       4,597us-gaap_ForeignCurrencyTransactionGainBeforeTax                            
Percentage on relief of total income tax   60.00%meli_PercentageOnReliefOfIncomeTax                                
Effective tax rate   22.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations                                
Aggregate tax benefit, total       2,102,000us-gaap_IncomeTaxHolidayAggregateDollarAmount                            
Aggregate per share effect of the Argentine tax holiday       $ 0.05us-gaap_IncomeTaxHolidayIncomeTaxBenefitsPerShare                            
Convertible senior notes, issued                             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		  
Convertible senior notes, interest rate                                 2.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember		  
Convertible senior notes, maturity date                           Jul. 01, 2019        
Convertible senior notes, conversion rate                           7.9353%us-gaap_DebtConversionConvertedInstrumentRate
/ us-gaap_LongtermDebtTypeAxis
= meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember		        
Convertible senior notes, conversion price                                 $ 126.02us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_LongtermDebtTypeAxis
= meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember		  
Convertible senior notes, principal amount per share                           1,000us-gaap_DebtConversionConvertedInstrumentAmount1
/ us-gaap_LongtermDebtTypeAxis
= meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember		        
Minimum percentage of principal amount outstanding   25.00%meli_MinimumPercentageOfPrincipalAmountOutstanding                                
Percent of principal holder of 25% of note can declare, including interest due and payable   100.00%meli_PercentOfPrincipalHolderOfMinimumPercentageOfNoteCanDeclareIncludingInterestDueAndPayable                                
Carrying value of the permanent equity component reported in additional paid-in-capital                             46,985,000us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt
/ us-gaap_LongtermDebtTypeAxis
= meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember		      
Net carrying amount                             283,015,000us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_LongtermDebtTypeAxis
= meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember		      
Cash flows, discount rate                             5.55%us-gaap_FairValueInputsDiscountRate
/ us-gaap_LongtermDebtTypeAxis
= meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember		      
Effective interest rate                             6.10%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember		      
Payment for capped call transactions   19,668,000us-gaap_PaymentsForHedgeFinancingActivities                               19,668,000us-gaap_PaymentsForHedgeFinancingActivities
/ us-gaap_DebtInstrumentAxis
= meli_CappedCallMember
/ us-gaap_LongtermDebtTypeAxis
= meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember
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		          
Net of deferred income tax effect amounts   $ 6,118,000us-gaap_DeferredIncomeTaxExpenseBenefit   $ (4,675,000)us-gaap_DeferredIncomeTaxExpenseBenefit                           $ 12,784,000us-gaap_DeferredIncomeTaxExpenseBenefit
/ us-gaap_DebtInstrumentAxis
= meli_CappedCallMember
/ us-gaap_LongtermDebtTypeAxis
= meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember