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Segment reporting - Allocation of Goodwill and Intangible Assets Based on Geography (Detail) (USD $) | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Other countries goodwill and intangible assets | $ 66,260,035 | $ 67,624,923
Total goodwill and intangible assets | 66,275,789 | 67,645,928
United States [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
US intangible assets | 15,754 | 21,005
Argentina [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Other countries goodwill and intangible assets | 19,067,487 | 20,328,154
Brazil [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Other countries goodwill and intangible assets | 11,129,343 | 10,724,007
Mexico [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Other countries goodwill and intangible assets | 14,667,740 | 14,644,795
Venezuela [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Other countries goodwill and intangible assets | 6,980,576 | 6,595,117
Other Countries [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Other countries goodwill and intangible assets | $ 14,414,889 | $ 15,332,850

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- Definition Other countries goodwill and intangible assets. + References No definition available. + Details
Name: | meli_EntityWideDisclosureOnGeographicAreasGoodwillAndIntangibleAssetsInForeignCountries
Namespace Prefix: | meli_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition US intangible assets. + References No definition available. + Details
Name: | meli_EntityWideDisclosureOnGeographicAreasIntangibleAssetsInEntitysCountryOfDomicile
Namespace Prefix: | meli_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition For goodwill, carrying amount as of the balance sheet date, which is the cumulative amount paid, adjusted for any amortization recognized prior to adoption of FAS 142 and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions. For the intangible assets, sum of carrying amounts, net of accumulated amortization and impairment charges. + References No definition available. + Details
Name: | meli_GoodwillAndIntangibleAssetsNet
Namespace Prefix: | meli_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration