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Segment Reporting (Allocation of Goodwill and Intangible Assets Based on Geography) (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Other countries goodwill and intangible assets	$ 88,225meli_EntityWideDisclosureOnGeographicAreasGoodwillAndIntangibleAssetsInForeignCountries		$ 91,828meli_EntityWideDisclosureOnGeographicAreasGoodwillAndIntangibleAssetsInForeignCountries
Total goodwill and intangible assets	88,378us-gaap_IntangibleAssetsNetIncludingGoodwill		92,000us-gaap_IntangibleAssetsNetIncludingGoodwill
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
US intangible assets	153meli_EntityWideDisclosureOnGeographicAreasIntangibleAssetsInEntitysCountryOfDomicile / us-gaap_StatementGeographicalAxis = country_US		172meli_EntityWideDisclosureOnGeographicAreasIntangibleAssetsInEntitysCountryOfDomicile / us-gaap_StatementGeographicalAxis = country_US
Argentina [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Other countries goodwill and intangible assets	12,975meli_EntityWideDisclosureOnGeographicAreasGoodwillAndIntangibleAssetsInForeignCountries / us-gaap_StatementGeographicalAxis = country_AR		12,580meli_EntityWideDisclosureOnGeographicAreasGoodwillAndIntangibleAssetsInForeignCountries / us-gaap_StatementGeographicalAxis = country_AR
Brazil [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Other countries goodwill and intangible assets	9,645meli_EntityWideDisclosureOnGeographicAreasGoodwillAndIntangibleAssetsInForeignCountries / us-gaap_StatementGeographicalAxis = country_BR		11,212meli_EntityWideDisclosureOnGeographicAreasGoodwillAndIntangibleAssetsInForeignCountries / us-gaap_StatementGeographicalAxis = country_BR
Mexico [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Other countries goodwill and intangible assets	20,929meli_EntityWideDisclosureOnGeographicAreasGoodwillAndIntangibleAssetsInForeignCountries / us-gaap_StatementGeographicalAxis = country_MX		21,734meli_EntityWideDisclosureOnGeographicAreasGoodwillAndIntangibleAssetsInForeignCountries / us-gaap_StatementGeographicalAxis = country_MX
Venezuela [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Other countries goodwill and intangible assets	7,480meli_EntityWideDisclosureOnGeographicAreasGoodwillAndIntangibleAssetsInForeignCountries / us-gaap_StatementGeographicalAxis = country_VE		7,515meli_EntityWideDisclosureOnGeographicAreasGoodwillAndIntangibleAssetsInForeignCountries / us-gaap_StatementGeographicalAxis = country_VE
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Other countries goodwill and intangible assets	$ 37,196meli_EntityWideDisclosureOnGeographicAreasGoodwillAndIntangibleAssetsInForeignCountries / us-gaap_StatementGeographicalAxis = meli_OtherCountriesMember	[1]	$ 38,787meli_EntityWideDisclosureOnGeographicAreasGoodwillAndIntangibleAssetsInForeignCountries / us-gaap_StatementGeographicalAxis = meli_OtherCountriesMember	[1]
[1] Includes the acquisition of online classified advertisement company in Chile. See Note 6.

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- Definition

Other countries goodwill and intangible assets.

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No definition available.

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- Definition

Carrying amount of finite-lived intangible assets, indefinite-lived intangible assets and goodwill. Goodwill is an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Intangible assets are assets, not including financial assets, lacking physical substance.

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No definition available.

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