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Business Combinations, Goodwill and Intangible Assets - Summary of Purchase Price Allocation for Acquisition (Detail) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Apr. 08, 2014
Business Acquisition [Line Items]        
Goodwill $ 68,828,504us-gaap_Goodwill $ 55,101,218us-gaap_Goodwill $ 60,366,063us-gaap_Goodwill  
Chile [Member]        
Business Acquisition [Line Items]        
Goodwill 19,101,451us-gaap_Goodwill
/ us-gaap_StatementGeographicalAxis
= country_CL
6,520,194us-gaap_Goodwill
/ us-gaap_StatementGeographicalAxis
= country_CL
7,115,211us-gaap_Goodwill
/ us-gaap_StatementGeographicalAxis
= country_CL
 
Mexico [Member]        
Business Acquisition [Line Items]        
Goodwill 15,718,697us-gaap_Goodwill
/ us-gaap_StatementGeographicalAxis
= country_MX
11,376,140us-gaap_Goodwill
/ us-gaap_StatementGeographicalAxis
= country_MX
11,404,780us-gaap_Goodwill
/ us-gaap_StatementGeographicalAxis
= country_MX
 
Online Classifieds Advertisement Companies in Chile and Mexico [Member]        
Business Acquisition [Line Items]        
Cash and cash equivalents       1,020,950us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
Other net tangible assets / (liabilities)       (421,059)meli_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherTangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
Deferred tax assets and liabilities       (2,429,811)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
Goodwill       20,783,292us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
Purchase Price       37,989,865meli_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       546,736us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
/ us-gaap_StatementGeographicalAxis
= country_CL
Other net tangible assets / (liabilities)       2,306,226meli_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherTangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
/ us-gaap_StatementGeographicalAxis
= country_CL
Deferred tax assets and liabilities       (2,643,784)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
/ us-gaap_StatementGeographicalAxis
= country_CL
Goodwill       14,709,583us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
/ us-gaap_StatementGeographicalAxis
= country_CL
Purchase Price       31,478,445meli_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       474,214us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
/ us-gaap_StatementGeographicalAxis
= country_MX
Other net tangible assets / (liabilities)       (2,727,285)meli_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherTangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
/ us-gaap_StatementGeographicalAxis
= country_MX
Deferred tax assets and liabilities       213,973us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
/ us-gaap_StatementGeographicalAxis
= country_MX
Goodwill       6,073,709us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
/ us-gaap_StatementGeographicalAxis
= country_MX
Purchase Price       6,511,420meli_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       10,425,868us-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       10,104,059us-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       321,809us-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       446,625us-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       446,625us-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       587,000us-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       587,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= meli_NonSolicitationAgreementsMember
/ us-gaap_StatementGeographicalAxis
= country_CL
Trademarks [Member] | Online Classifieds Advertisement Companies in Chile and Mexico [Member]        
Business Acquisition [Line Items]        
Intangible assets       7,577,000us-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       5,422,000us-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       $ 2,155,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
/ us-gaap_StatementGeographicalAxis
= country_MX