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Segment Reporting - Allocation of Goodwill and Intangible Assets Based on Geography (Detail) (USD $) | Mar. 31, 2014 | Dec. 31, 2013
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Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Other countries goodwill and intangible assets | $ 58,345,157 | $ 61,682,300
Total goodwill and intangible assets | 58,353,034 | 61,692,803
United States [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
US intangible assets | 7,877 | 10,503
Argentina [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Other countries goodwill and intangible assets | 12,650,884 | 15,575,776
Brazil [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Other countries goodwill and intangible assets | 10,520,047 | 10,380,974
Mexico [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Other countries goodwill and intangible assets | 14,497,179 | 14,512,949
Venezuela [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Other countries goodwill and intangible assets | 6,906,569 | 6,913,604
Other Countries [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Other countries goodwill and intangible assets | $ 13,770,478 | $ 14,298,997

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- Definition Other countries goodwill and intangible assets. + References No definition available. + Details
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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

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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. + References No definition available. + Details
Name: | us-gaap_IntangibleAssetsNetIncludingGoodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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