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Commitments and Contingencies - Additional Information (Detail)
 0 Months Ended 12 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Apr. 11, 2006
USD ($)
Dec. 31, 2014
USD ($)
LegalMatter
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Mar. 31, 2007
USD ($)
Dec. 31, 2014
Chilean Acquisition [Member]
USD ($)
Dec. 31, 2014
Long Term Retention Plan 2009 [Member]
USD ($)
Dec. 31, 2014
Long Term Retention Plan 2010 [Member]
USD ($)
Dec. 31, 2014
Long Term Retention Plan 2011 [Member]
USD ($)
Dec. 31, 2014
Long Term Retention Plan 2012 [Member]
USD ($)
Dec. 31, 2014
Long Term Retention Plan 2013 [Member]
USD ($)
Dec. 31, 2014
Long Term Retention Plan 2014 [Member]
USD ($)
Dec. 31, 2014
Argentinean Subsidiaries [Member]
LegalMatter
Lawsuits
Dec. 31, 2013
Argentinean Subsidiaries [Member]
Buenos Aires [Member]
CreditFacility
Dec. 31, 2014
Argentinean Subsidiaries [Member]
Buenos Aires [Member]
USD ($)
Dec. 31, 2014
Argentinean Subsidiaries [Member]
Buenos Aires [Member]
ARS
Dec. 31, 2014
Mexican Subsidiaries [Member]
LegalMatter
Dec. 31, 2014
Mexican Ordinary Courts [Member]
LegalMatter
Aug. 25, 2010
State of Sao Paulo Fraud Claim [Member]
USD ($)
Jun. 26, 2009
State of Sao Paulo Fraud Claim [Member]
USD ($)
Sep. 23, 2010
Litigation and Other Legal Matters [Member]
USD ($)
Aug. 15, 2011
City of Sao Paulo Tax Claim [Member]
USD ($)
Dec. 31, 2014
City of Sao Paulo Tax Claim [Member]
USD ($)
Dec. 31, 2014
City of Sao Paulo Tax Claim [Member]
BRL
Dec. 31, 2007
City of Sao Paulo Tax Claim [Member]
USD ($)
Sep. 29, 2014
State of Rio Grande Do Sul Service Claim [Member]
Mercadolibre [Member]
USD ($)
Sep. 29, 2014
State of Rio Grande Do Sul Service Claim [Member]
Mercadolibre [Member]
ARS
Dec. 31, 2014
Brazilian Federal Tax Claims [Member]
USD ($)
Dec. 31, 2014
Brazilian Federal Tax Claims [Member]
BRL
Loss Contingencies [Line Items]                                                          
Reserves for proceeding-related contingencies   $ 3,008,537us-gaap_LossContingencyAccrualAtCarryingValue                                                      
Aggregate amount for legal actions for which no loss amount has been accrued   4,451,708meli_AggregateAmountForLegalActionsForWhichNoLossAmountHasBeenAccrued                                                      
Number of lawsuits pending                         34meli_LawsuitsPending
/ dei_LegalEntityAxis
= meli_ArgentineanSubsidiariesMember		                                
Number of legal actions pending   651us-gaap_LossContingencyPendingClaimsNumber                     715us-gaap_LossContingencyPendingClaimsNumber
/ dei_LegalEntityAxis
= meli_ArgentineanSubsidiariesMember		       60us-gaap_LossContingencyPendingClaimsNumber
/ dei_LegalEntityAxis
= meli_MexicanSubsidiariesMember		 1us-gaap_LossContingencyPendingClaimsNumber
/ dei_LegalEntityAxis
= meli_MexicanOrdinaryCourtsMember		                      
Loss contingency pending cases related to consumer courts   2,535meli_LossContingencyPendingCasesRelatedToConsumerCourts                                                      
Daily non-compliance penalty 5,300us-gaap_LossContingencyDamagesSoughtValue                                   6,000us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= meli_StateOfSaoPauloFraudClaimMember		 2,500us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= meli_StateOfSaoPauloFraudClaimMember		           430,000us-gaap_LossContingencyDamagesSoughtValue
/ dei_LegalEntityAxis
= meli_MercadolibreMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= meli_StateOfRioGrandeDoSulServiceClaimMember		 3,200,000us-gaap_LossContingencyDamagesSoughtValue
/ dei_LegalEntityAxis
= meli_MercadolibreMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= meli_StateOfRioGrandeDoSulServiceClaimMember		    
Fine against company's subsidiaries         3,500,000meli_FineAgainstCompanysSubsidiaries                                                
Penalty and damages                                         6,000us-gaap_LossContingencyDamagesAwardedValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= meli_LitigationAndOtherLegalMattersMember		                
Approximate additional amount related to asserted taxes and fines                                             15,400,000us-gaap_IncomeTaxExaminationEstimateOfPossibleLoss
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= meli_CityOfSaoPauloTaxClaimMember		 41,000,000us-gaap_IncomeTaxExaminationEstimateOfPossibleLoss
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= meli_CityOfSaoPauloTaxClaimMember		 5,900,000us-gaap_IncomeTaxExaminationEstimateOfPossibleLoss
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= meli_CityOfSaoPauloTaxClaimMember		     2,000,000us-gaap_IncomeTaxExaminationEstimateOfPossibleLoss
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= meli_BrazilianFederalTaxClaimsMember		 5,200,000us-gaap_IncomeTaxExaminationEstimateOfPossibleLoss
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= meli_BrazilianFederalTaxClaimsMember
Total amount of claim including surcharges and interest                                             5,800,000meli_LossContingencyEstimateOfPossibleLossIncludingSurchargesAndInterest
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= meli_CityOfSaoPauloTaxClaimMember		            
Deposit with court                                           9,500,000meli_LossContingencyDepositsWithCourtOfLaw
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= meli_CityOfSaoPauloTaxClaimMember		              
Accrued interests                                             3,900,000meli_LossContingencyInterestAccruedOnSettlement
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= meli_CityOfSaoPauloTaxClaimMember		 10,400,000meli_LossContingencyInterestAccruedOnSettlement
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= meli_CityOfSaoPauloTaxClaimMember		          
Payment of unpaid monthly obligations for employees                                                   10 years 10 years    
Total rental expense, for leases office space   3,111,137us-gaap_LeaseAndRentalExpense 3,043,604us-gaap_LeaseAndRentalExpense 2,441,866us-gaap_LeaseAndRentalExpense                                                  
Officers' Compensation   1,529,000meli_EstimatedOfficersCompensation                                                      
Performance based estimated bonus aggregate   1,641,000meli_EstimatedPerformanceBasedBonus                                                      
Period of consideration for involuntary termination of employee   12 months                                                      
Amount received by executive officers             1,546,000meli_PaymentToExecutiveOfficers
/ us-gaap_PlanNameAxis
= meli_LongTermRetentionPlanTwoZeroZeroNineMember		 3,298,000meli_PaymentToExecutiveOfficers
/ us-gaap_PlanNameAxis
= meli_LongTermRetentionPlanTwoZeroOneZeroMember		 4,106,000meli_PaymentToExecutiveOfficers
/ us-gaap_PlanNameAxis
= meli_LongTermRetentionPlanTwoZeroOneOneMember		 5,099,000meli_PaymentToExecutiveOfficers
/ us-gaap_PlanNameAxis
= meli_LongTermRetentionPlanTwoZeroOneTwoMember		 11,294,000meli_PaymentToExecutiveOfficers
/ us-gaap_PlanNameAxis
= meli_LongTermRetentionPlanTwoZeroOneThreeMember		 10,814,000meli_PaymentToExecutiveOfficers
/ us-gaap_PlanNameAxis
= meli_LongTermRetentionPlanTwoZeroOneFourMember		                                  
Period of shares             2 years 3 months 3 years 3 months 4 years 3 months 5 years 3 months 4 years 3 months 5 years 3 months                                  
Outstanding unsecured line of credit                             1,942,275us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= meli_ArgentineanSubsidiariesMember
/ us-gaap_StatementGeographicalAxis
= meli_BuenosAiresMember		 16,625,876us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= meli_ArgentineanSubsidiariesMember
/ us-gaap_StatementGeographicalAxis
= meli_BuenosAiresMember		                          
Percentage of outstanding unsecured line of credit                             15.25%meli_LineOfCreditFacilityFixedInterestRate
/ dei_LegalEntityAxis
= meli_ArgentineanSubsidiariesMember
/ us-gaap_StatementGeographicalAxis
= meli_BuenosAiresMember		 15.25%meli_LineOfCreditFacilityFixedInterestRate
/ dei_LegalEntityAxis
= meli_ArgentineanSubsidiariesMember
/ us-gaap_StatementGeographicalAxis
= meli_BuenosAiresMember		                          
Unsecured line of credit maturity period                             48 months 48 months                          
Number of Unsecured line of credit facility                           2meli_NumberOfUnsecuredLineOfCreditFacility
/ dei_LegalEntityAxis
= meli_ArgentineanSubsidiariesMember
/ us-gaap_StatementGeographicalAxis
= meli_BuenosAiresMember		                              
Liabilities   611,059,325us-gaap_Liabilities 244,879,165us-gaap_Liabilities     1,116,746us-gaap_Liabilities
/ us-gaap_BusinessAcquisitionAxis
= meli_ChileanAcquisitionMember		                                              
Current liabilities   292,622,153us-gaap_LiabilitiesCurrent 224,165,609us-gaap_LiabilitiesCurrent     648,148us-gaap_LiabilitiesCurrent
/ us-gaap_BusinessAcquisitionAxis
= meli_ChileanAcquisitionMember		                                              
Non-current liabilities   $ 318,437,172us-gaap_LiabilitiesNoncurrent $ 20,713,556us-gaap_LiabilitiesNoncurrent     $ 468,598us-gaap_LiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= meli_ChileanAcquisitionMember