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Business Combinations, Goodwill and Intangible Assets - Composition of Goodwill and Intangible Assets (Detail) (USD $) | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 22, 2013
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Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Goodwill | $ 68,828,504 us-gaap_Goodwill | $ 55,101,218 us-gaap_Goodwill | $ 60,366,063 us-gaap_Goodwill |
Total intangible assets, net | 23,171,349 us-gaap_IntangibleAssetsNetExcludingGoodwill | 6,591,585 us-gaap_IntangibleAssetsNetExcludingGoodwill |  |
Software Development Company in Argentina [Member] |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Goodwill | 68,828,504 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = meli_SoftwareDevelopmentCompanyInArgentinaMember | 55,101,218 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = meli_SoftwareDevelopmentCompanyInArgentinaMember |  | 2,668,661 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = meli_SoftwareDevelopmentCompanyInArgentinaMember
Total intangible assets | 28,510,258 meli_IntangibleAssetsAndGoodwillGross / us-gaap_BusinessAcquisitionAxis = meli_SoftwareDevelopmentCompanyInArgentinaMember | 11,261,888 meli_IntangibleAssetsAndGoodwillGross / us-gaap_BusinessAcquisitionAxis = meli_SoftwareDevelopmentCompanyInArgentinaMember |  |
Accumulated amortization | (5,338,909)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BusinessAcquisitionAxis = meli_SoftwareDevelopmentCompanyInArgentinaMember | (4,670,303)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BusinessAcquisitionAxis = meli_SoftwareDevelopmentCompanyInArgentinaMember |  |
Total intangible assets, net | 23,171,349 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_BusinessAcquisitionAxis = meli_SoftwareDevelopmentCompanyInArgentinaMember | 6,591,585 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_BusinessAcquisitionAxis = meli_SoftwareDevelopmentCompanyInArgentinaMember |  |
Software Development Company in Argentina [Member] | Licenses and Others [Member] |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Gross | 5,110,836 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = meli_SoftwareDevelopmentCompanyInArgentinaMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember | 3,430,003 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = meli_SoftwareDevelopmentCompanyInArgentinaMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember |  |
Software Development Company in Argentina [Member] | Non-Compete Agreement [Member] |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Gross | 1,829,208 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = meli_SoftwareDevelopmentCompanyInArgentinaMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember | 1,025,605 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = meli_SoftwareDevelopmentCompanyInArgentinaMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |  |
Software Development Company in Argentina [Member] | Customer Lists [Member] |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Gross | 11,293,828 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = meli_SoftwareDevelopmentCompanyInArgentinaMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember | 1,568,190 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = meli_SoftwareDevelopmentCompanyInArgentinaMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember |  |
Software Development Company in Argentina [Member] | Trademarks [Member] |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Trademarks | $ 10,276,386 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_BusinessAcquisitionAxis = meli_SoftwareDevelopmentCompanyInArgentinaMember / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember | $ 5,238,090 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_BusinessAcquisitionAxis = meli_SoftwareDevelopmentCompanyInArgentinaMember / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |  |

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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