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Business Combinations, Goodwill and Intangible Assets - Definitive Purchase Price Allocation for Acquisition (Detail)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2014
Software Development Company in Argentina [Member]
USD ($)
Dec. 31, 2013
Software Development Company in Argentina [Member]
USD ($)
Mar. 22, 2013
Software Development Company in Argentina [Member]
USD ($)
Mar. 22, 2013
Software Development Company in Argentina [Member]
ARS
Dec. 15, 2014
Business Vision S.A. [Member]
USD ($)
Dec. 15, 2014
Business Vision S.A. [Member]
Customer Lists [Member]
USD ($)
Dec. 15, 2014
Business Vision S.A. [Member]
Non Solicitation Agreement [Member]
USD ($)
Business Acquisition [Line Items]                    
Cash and cash equivalents               $ 81,219us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= meli_BusinessVisionSaMember
   
Other net tangible assets               856,781meli_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherTangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= meli_BusinessVisionSaMember
   
Net assets acquired           237,891us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= meli_SoftwareDevelopmentCompanyInArgentinaMember
  938,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= meli_BusinessVisionSaMember
   
Intangible assets                 563,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_BusinessVisionSaMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
427,976us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_BusinessVisionSaMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= meli_NonSolicitationAgreementsMember
Deferred tax assets and liabilities               (299,770)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= meli_BusinessVisionSaMember
   
Goodwill 68,828,504us-gaap_Goodwill 55,101,218us-gaap_Goodwill 60,366,063us-gaap_Goodwill 68,828,504us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_SoftwareDevelopmentCompanyInArgentinaMember
55,101,218us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_SoftwareDevelopmentCompanyInArgentinaMember
2,668,661us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_SoftwareDevelopmentCompanyInArgentinaMember
  3,139,343us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_BusinessVisionSaMember
   
Purchase Price           2,906,552meli_BusinessAcquisitionPurchasePriceAllocationNetAssetIncludingGoodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_SoftwareDevelopmentCompanyInArgentinaMember
  4,768,549meli_BusinessAcquisitionPurchasePriceAllocationNetAssetIncludingGoodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_BusinessVisionSaMember
   
Escrow for employment relationship           547,945us-gaap_EscrowDeposit
/ us-gaap_BusinessAcquisitionAxis
= meli_SoftwareDevelopmentCompanyInArgentinaMember
       
Aggregate price paid           $ 3,454,497us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= meli_SoftwareDevelopmentCompanyInArgentinaMember
17,652,480us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= meli_SoftwareDevelopmentCompanyInArgentinaMember
$ 4,768,549us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= meli_BusinessVisionSaMember