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Segments - Allocation of Goodwill and Intangible Assets Based on Geography (Detail) (USD $)	Dec. 31, 2014		Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Other countries goodwill and intangible assets	$ 91,828,390meli_EntityWideDisclosureOnGeographicAreasGoodwillAndIntangibleAssetsInForeignCountries		$ 61,682,300meli_EntityWideDisclosureOnGeographicAreasGoodwillAndIntangibleAssetsInForeignCountries
Total goodwill and intangible assets	91,999,853us-gaap_IntangibleAssetsNetIncludingGoodwill		61,692,803us-gaap_IntangibleAssetsNetIncludingGoodwill
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
US intangible assets	171,463meli_EntityWideDisclosureOnGeographicAreasIntangibleAssetsInEntitysCountryOfDomicile / us-gaap_StatementGeographicalAxis = country_US		10,503meli_EntityWideDisclosureOnGeographicAreasIntangibleAssetsInEntitysCountryOfDomicile / us-gaap_StatementGeographicalAxis = country_US
Argentina [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Other countries goodwill and intangible assets	12,580,157meli_EntityWideDisclosureOnGeographicAreasGoodwillAndIntangibleAssetsInForeignCountries / us-gaap_StatementGeographicalAxis = country_AR		15,575,776meli_EntityWideDisclosureOnGeographicAreasGoodwillAndIntangibleAssetsInForeignCountries / us-gaap_StatementGeographicalAxis = country_AR
Brazil [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Other countries goodwill and intangible assets	11,212,437meli_EntityWideDisclosureOnGeographicAreasGoodwillAndIntangibleAssetsInForeignCountries / us-gaap_StatementGeographicalAxis = country_BR		10,380,974meli_EntityWideDisclosureOnGeographicAreasGoodwillAndIntangibleAssetsInForeignCountries / us-gaap_StatementGeographicalAxis = country_BR
Mexico [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Other countries goodwill and intangible assets	21,734,078meli_EntityWideDisclosureOnGeographicAreasGoodwillAndIntangibleAssetsInForeignCountries / us-gaap_StatementGeographicalAxis = country_MX		14,512,949meli_EntityWideDisclosureOnGeographicAreasGoodwillAndIntangibleAssetsInForeignCountries / us-gaap_StatementGeographicalAxis = country_MX
Venezuela [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Other countries goodwill and intangible assets	7,514,679meli_EntityWideDisclosureOnGeographicAreasGoodwillAndIntangibleAssetsInForeignCountries / us-gaap_StatementGeographicalAxis = country_VE		6,913,604meli_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	$ 38,787,039meli_EntityWideDisclosureOnGeographicAreasGoodwillAndIntangibleAssetsInForeignCountries / us-gaap_StatementGeographicalAxis = meli_OtherCountriesMember	[1]	$ 14,298,997meli_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

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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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