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Business Combinations, Goodwill and Intangible Assets - Table Showing Changes in Carrying Amount of Goodwill (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Goodwill [Line Items] |  |
Balance, beginning of the year | $ 55,101,218 us-gaap_Goodwill | $ 60,366,063 us-gaap_Goodwill
Business Acquisition | 23,922,635 us-gaap_GoodwillAcquiredDuringPeriod | 2,668,661 us-gaap_GoodwillAcquiredDuringPeriod
Effect of exchange rates changes | (10,195,349)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments | (7,933,506)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments
Balance, end of the year | 68,828,504 us-gaap_Goodwill | 55,101,218 us-gaap_Goodwill
Brazil [Member] |  |
Goodwill [Line Items] |  |
Balance, beginning of the year | 10,366,018 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_BR | 10,706,281 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_BR
Business Acquisition | 1,538,278 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementGeographicalAxis = country_BR | 1,307,644 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementGeographicalAxis = country_BR
Effect of exchange rates changes | (1,347,193)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementGeographicalAxis = country_BR | (1,647,907)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementGeographicalAxis = country_BR
Balance, end of the year | 10,557,103 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_BR | 10,366,018 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_BR
Argentina [Member] |  |
Goodwill [Line Items] |  |
Balance, beginning of the year | 14,676,145 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_AR | 18,889,094 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_AR
Business Acquisition | 775,418 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementGeographicalAxis = country_AR | 659,159 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementGeographicalAxis = country_AR
Effect of exchange rates changes | (3,592,495)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementGeographicalAxis = country_AR | (4,872,108)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementGeographicalAxis = country_AR
Balance, end of the year | 11,859,068 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_AR | 14,676,145 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_AR
Chile [Member] |  |
Goodwill [Line Items] |  |
Balance, beginning of the year | 6,520,194 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_CL | 7,115,211 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_CL
Business Acquisition | 14,709,583 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementGeographicalAxis = country_CL |
Effect of exchange rates changes | (2,128,326)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementGeographicalAxis = country_CL | (595,017)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementGeographicalAxis = country_CL
Balance, end of the year | 19,101,451 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_CL | 6,520,194 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_CL
Mexico [Member] |  |
Goodwill [Line Items] |  |
Balance, beginning of the year | 11,376,140 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_MX | 11,404,780 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_MX
Business Acquisition | 6,293,463 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementGeographicalAxis = country_MX | 186,806 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementGeographicalAxis = country_MX
Effect of exchange rates changes | (1,950,906)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementGeographicalAxis = country_MX | (215,446)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementGeographicalAxis = country_MX
Balance, end of the year | 15,718,697 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_MX | 11,376,140 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_MX
Venezuela [Member] |  |
Goodwill [Line Items] |  |
Balance, beginning of the year | 5,251,667 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_VE | 4,846,030 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_VE
Business Acquisition | 477,180 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementGeographicalAxis = country_VE | 405,637 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementGeographicalAxis = country_VE
Balance, end of the year | 5,728,847 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_VE | 5,251,667 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_VE
Colombia [Member] |  |
Goodwill [Line Items] |  |
Balance, beginning of the year | 5,506,062 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_CO | 5,897,136 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_CO
Business Acquisition | 81,623 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementGeographicalAxis = country_CO | 69,385 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementGeographicalAxis = country_CO
Effect of exchange rates changes | (1,066,229)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementGeographicalAxis = country_CO | (460,459)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementGeographicalAxis = country_CO
Balance, end of the year | 4,521,456 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_CO | 5,506,062 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = country_CO
Other Countries [Member] |  |
Goodwill [Line Items] |  |
Balance, beginning of the year | 1,404,992 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = meli_OtherCountriesMember | 1,507,531 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = meli_OtherCountriesMember
Business Acquisition | 47,090 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementGeographicalAxis = meli_OtherCountriesMember | 40,030 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementGeographicalAxis = meli_OtherCountriesMember
Effect of exchange rates changes | (110,200)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementGeographicalAxis = meli_OtherCountriesMember | (142,569)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementGeographicalAxis = meli_OtherCountriesMember
Balance, end of the year | $ 1,341,882 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = meli_OtherCountriesMember | $ 1,404,992 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = meli_OtherCountriesMember

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