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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
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Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 68,828,504 us-gaap_Goodwill | $ 55,101,218 us-gaap_Goodwill | $ 60,366,063 us-gaap_Goodwill |
Chile [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill | 19,101,451 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_CL | 6,520,194 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_CL | 7,115,211 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_CL |
Mexico [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill | 15,718,697 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_MX | 11,376,140 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_MX | 11,404,780 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_MX |
Online Classifieds Advertisement Companies in Chile and Mexico [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash and cash equivalents |  |  |  | 1,020,950 us-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 |  |  |  | 20,783,292 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember
Purchase Price |  |  |  | 37,989,865 meli_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 |  |  |  | 546,736 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember / us-gaap_StatementGeographicalAxis = country_CL
Other net tangible assets / (liabilities) |  |  |  | 2,306,226 meli_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 |  |  |  | 14,709,583 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember / us-gaap_StatementGeographicalAxis = country_CL
Purchase Price |  |  |  | 31,478,445 meli_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 |  |  |  | 474,214 us-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 |  |  |  | 213,973 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent / us-gaap_BusinessAcquisitionAxis = meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember / us-gaap_StatementGeographicalAxis = country_MX
Goodwill |  |  |  | 6,073,709 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember / us-gaap_StatementGeographicalAxis = country_MX
Purchase Price |  |  |  | 6,511,420 meli_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 |  |  |  | 10,425,868 us-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 |  |  |  | 10,104,059 us-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 |  |  |  | 321,809 us-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 |  |  |  | 446,625 us-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 |  |  |  | 446,625 us-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 |  |  |  | 587,000 us-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 |  |  |  | 587,000 us-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 |  |  |  | 7,577,000 us-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 |  |  |  | 5,422,000 us-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 |  |  |  | $ 2,155,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = meli_OnlineClassifiedsAdvertisementCompaniesInChileAndMexicoMember / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementGeographicalAxis = country_MX

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