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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
Indefinite-lived Intangible Assets [Line Items]
Goodwill	$ 68,828,504us-gaap_Goodwill	$ 55,101,218us-gaap_Goodwill	$ 60,366,063us-gaap_Goodwill
Total intangible assets, net	23,171,349us-gaap_IntangibleAssetsNetExcludingGoodwill	6,591,585us-gaap_IntangibleAssetsNetExcludingGoodwill
Software Development Company in Argentina [Member]
Indefinite-lived Intangible Assets [Line Items]
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
Total intangible assets	28,510,258meli_IntangibleAssetsAndGoodwillGross / us-gaap_BusinessAcquisitionAxis = meli_SoftwareDevelopmentCompanyInArgentinaMember	11,261,888meli_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	23,171,349us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_BusinessAcquisitionAxis = meli_SoftwareDevelopmentCompanyInArgentinaMember	6,591,585us-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	5,110,836us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = meli_SoftwareDevelopmentCompanyInArgentinaMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember	3,430,003us-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	1,829,208us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = meli_SoftwareDevelopmentCompanyInArgentinaMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember	1,025,605us-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	11,293,828us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = meli_SoftwareDevelopmentCompanyInArgentinaMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember	1,568,190us-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	$ 10,276,386us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_BusinessAcquisitionAxis = meli_SoftwareDevelopmentCompanyInArgentinaMember / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember	$ 5,238,090us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_BusinessAcquisitionAxis = meli_SoftwareDevelopmentCompanyInArgentinaMember / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember

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- Definition

Intangible assets and goodwill gross.

+ References

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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

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-Section 50

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- Definition

Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

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