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Business Combinations, Goodwill and Intangible Assets (Table Showing Changes in Carrying Amount of Goodwill) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Goodwill [Line Items] |  |
Balance, beginning of the period | $ 68,829 us-gaap_Goodwill | $ 55,101 us-gaap_Goodwill
Business Acquisition |  | 23,923 us-gaap_GoodwillAcquiredDuringPeriod
Effect of exchange rates changes | (3,252)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments | (10,195)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments
Balance, end of the period | 65,577 us-gaap_Goodwill | 68,829 us-gaap_Goodwill
Brazil [Member] |  |
Goodwill [Line Items] |  |
Balance, beginning of the period | 10,557 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_BR | 10,366 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_BR
Business Acquisition |  | 1,538 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementGeographicalAxis = country_BR
Effect of exchange rates changes | (1,381)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementGeographicalAxis = country_BR | (1,347)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementGeographicalAxis = country_BR
Balance, end of the period | 9,176 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_BR | 10,557 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_BR
Argentina [Member] |  |
Goodwill [Line Items] |  |
Balance, beginning of the period | 11,859 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_AR | 14,676 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_AR
Business Acquisition |  | 775 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementGeographicalAxis = country_AR
Effect of exchange rates changes | (376)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementGeographicalAxis = country_AR | (3,592)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementGeographicalAxis = country_AR
Balance, end of the period | 11,483 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_AR | 11,859 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_AR
Chile [Member] |  |
Goodwill [Line Items] |  |
Balance, beginning of the period | 19,101 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_CL | 6,520 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_CL
Business Acquisition |  | 14,710 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementGeographicalAxis = country_CL
Effect of exchange rates changes | (579)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementGeographicalAxis = country_CL | (2,129)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementGeographicalAxis = country_CL
Balance, end of the period | 18,522 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_CL | 19,101 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_CL
Mexico [Member] |  |
Goodwill [Line Items] |  |
Balance, beginning of the period | 15,719 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_MX | 11,376 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_MX
Business Acquisition |  | 6,293 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementGeographicalAxis = country_MX
Effect of exchange rates changes | (552)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementGeographicalAxis = country_MX | (1,950)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementGeographicalAxis = country_MX
Balance, end of the period | 15,167 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_MX | 15,719 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_MX
Venezuela [Member] |  |
Goodwill [Line Items] |  |
Balance, beginning of the period | 5,729 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_VE | 5,252 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_VE
Business Acquisition |  | 477 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementGeographicalAxis = country_VE
Effect of exchange rates changes |  |
Balance, end of the period | 5,729 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_VE | 5,729 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_VE
Colombia [Member] |  |
Goodwill [Line Items] |  |
Balance, beginning of the period | 4,521 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_CO | 5,506 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_CO
Business Acquisition |  | 82 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementGeographicalAxis = country_CO
Effect of exchange rates changes | (314)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementGeographicalAxis = country_CO | (1,067)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementGeographicalAxis = country_CO
Balance, end of the period | 4,207 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_CO | 4,521 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_CO
Other Countries [Member] |  |
Goodwill [Line Items] |  |
Balance, beginning of the period | 1,343 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = meli_OtherCountriesMember | 1,405 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = meli_OtherCountriesMember
Business Acquisition |  | 48 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementGeographicalAxis = meli_OtherCountriesMember
Effect of exchange rates changes | (50)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementGeographicalAxis = meli_OtherCountriesMember | (110)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementGeographicalAxis = meli_OtherCountriesMember
Balance, end of the period | $ 1,293 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = meli_OtherCountriesMember | $ 1,343 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = meli_OtherCountriesMember

X
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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Balance Type: | debit
Period Type: | instant

X
- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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Data Type: | na
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