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Business Combinations, Goodwill and Intangible Assets (Summary of Preliminary Purchase Price Allocation for Acquisition) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Apr. 08, 2014
Dec. 15, 2014
Business Acquisition [Line Items]          
Goodwill $ 65,577us-gaap_Goodwill $ 68,829us-gaap_Goodwill $ 55,101us-gaap_Goodwill    
Chile [Member]          
Business Acquisition [Line Items]          
Goodwill 18,522us-gaap_Goodwill
/ us-gaap_StatementGeographicalAxis
= country_CL
19,101us-gaap_Goodwill
/ us-gaap_StatementGeographicalAxis
= country_CL
6,520us-gaap_Goodwill
/ us-gaap_StatementGeographicalAxis
= country_CL
   
Mexico [Member]          
Business Acquisition [Line Items]          
Goodwill 15,167us-gaap_Goodwill
/ us-gaap_StatementGeographicalAxis
= country_MX
15,719us-gaap_Goodwill
/ us-gaap_StatementGeographicalAxis
= country_MX
11,376us-gaap_Goodwill
/ us-gaap_StatementGeographicalAxis
= country_MX
   
Online Classifieds Advertisement Companies in Chile and Mexico [Member]          
Business Acquisition [Line Items]          
Cash and cash equivalents       1,021us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
 
Other net tangible assets / (liabilities)       (421)meli_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherTangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
 
Deferred tax assets and liabilities       (2,430)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
 
Goodwill       20,783us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
 
Purchase Price       37,990meli_BusinessAcquisitionPurchasePriceAllocationNetAssetIncludingGoodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
 
Online Classifieds Advertisement Companies in Chile and Mexico [Member] | Chile [Member]          
Business Acquisition [Line Items]          
Cash and cash equivalents       547us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
/ us-gaap_StatementGeographicalAxis
= country_CL
 
Other net tangible assets / (liabilities)       2,306meli_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherTangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
/ us-gaap_StatementGeographicalAxis
= country_CL
 
Deferred tax assets and liabilities       (2,644)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
/ us-gaap_StatementGeographicalAxis
= country_CL
 
Goodwill       14,709us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
/ us-gaap_StatementGeographicalAxis
= country_CL
 
Purchase Price       31,478meli_BusinessAcquisitionPurchasePriceAllocationNetAssetIncludingGoodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
/ us-gaap_StatementGeographicalAxis
= country_CL
 
Online Classifieds Advertisement Companies in Chile and Mexico [Member] | Mexico [Member]          
Business Acquisition [Line Items]          
Cash and cash equivalents       474us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
/ us-gaap_StatementGeographicalAxis
= country_MX
 
Other net tangible assets / (liabilities)       (2,727)meli_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherTangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
/ us-gaap_StatementGeographicalAxis
= country_MX
 
Deferred tax assets and liabilities       214us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
/ us-gaap_StatementGeographicalAxis
= country_MX
 
Goodwill       6,074us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
/ us-gaap_StatementGeographicalAxis
= country_MX
 
Purchase Price       6,512meli_BusinessAcquisitionPurchasePriceAllocationNetAssetIncludingGoodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
/ us-gaap_StatementGeographicalAxis
= country_MX
 
Online Classifieds Advertisement Companies in Chile and Mexico [Member] | Customer Lists [Member]          
Business Acquisition [Line Items]          
Intangible assets       10,426us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
 
Online Classifieds Advertisement Companies in Chile and Mexico [Member] | Customer Lists [Member] | Chile [Member]          
Business Acquisition [Line Items]          
Intangible assets       10,104us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
/ us-gaap_StatementGeographicalAxis
= country_CL
 
Online Classifieds Advertisement Companies in Chile and Mexico [Member] | Customer Lists [Member] | Mexico [Member]          
Business Acquisition [Line Items]          
Intangible assets       322us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
/ us-gaap_StatementGeographicalAxis
= country_MX
 
Online Classifieds Advertisement Companies in Chile and Mexico [Member] | Software [Member]          
Business Acquisition [Line Items]          
Intangible assets       447us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
 
Online Classifieds Advertisement Companies in Chile and Mexico [Member] | Software [Member] | Chile [Member]          
Business Acquisition [Line Items]          
Intangible assets       447us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
/ us-gaap_StatementGeographicalAxis
= country_CL
 
Online Classifieds Advertisement Companies in Chile and Mexico [Member] | Non Solicitation Agreement [Member]          
Business Acquisition [Line Items]          
Intangible assets       587us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= meli_NonSolicitationAgreementsMember
 
Online Classifieds Advertisement Companies in Chile and Mexico [Member] | Non Solicitation Agreement [Member] | Chile [Member]          
Business Acquisition [Line Items]          
Intangible assets       587us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= meli_NonSolicitationAgreementsMember
/ us-gaap_StatementGeographicalAxis
= country_CL
 
Business Vision S.A. [Member]          
Business Acquisition [Line Items]          
Cash and cash equivalents         81us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= meli_BusinessVisionS.a.Member
Other net tangible assets / (liabilities)         857meli_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherTangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= meli_BusinessVisionS.a.Member
Total net tangible assets acquired         938meli_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTotalNetTangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= meli_BusinessVisionS.a.Member
Deferred tax assets and liabilities         (300)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= meli_BusinessVisionS.a.Member
Goodwill         3,139us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_BusinessVisionS.a.Member
Purchase Price         4,768meli_BusinessAcquisitionPurchasePriceAllocationNetAssetIncludingGoodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_BusinessVisionS.a.Member
Business Vision S.A. [Member] | Customer Lists [Member]          
Business Acquisition [Line Items]          
Intangible assets         563us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_BusinessVisionS.a.Member
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
Business Vision S.A. [Member] | Non Solicitation Agreement [Member]          
Business Acquisition [Line Items]          
Intangible assets         428us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_BusinessVisionS.a.Member
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= meli_NonSolicitationAgreementsMember
Trademarks [Member] | Online Classifieds Advertisement Companies in Chile and Mexico [Member]          
Business Acquisition [Line Items]          
Intangible assets       7,577us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
 
Trademarks [Member] | Online Classifieds Advertisement Companies in Chile and Mexico [Member] | Chile [Member]          
Business Acquisition [Line Items]          
Intangible assets       5,422us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
/ us-gaap_StatementGeographicalAxis
= country_CL
 
Trademarks [Member] | Online Classifieds Advertisement Companies in Chile and Mexico [Member] | Mexico [Member]          
Business Acquisition [Line Items]          
Intangible assets       $ 2,155us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
/ us-gaap_StatementGeographicalAxis
= country_MX