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

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

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- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |

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- Details
Name: | us-gaap_StatementGeographicalAxis=country_BR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementGeographicalAxis=country_MX
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementGeographicalAxis=country_VE
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |