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Long Term Retention Plan - Additional Information (Detail) (USD $) | 12 Months Ended | 0 Months Ended |
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Dec. 31, 2013 | Dec. 31, 2012 Quotas | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2014 | Mar. 31, 2015 | Aug. 08, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Employee retention program payable in cash |  |  |  |  |  |  |  | 50.00%meli_EmployeeRetentionProgramPayableInCash
Employee retention program payable in shares |  |  |  |  |  |  |  | 50.00%meli_EmployeeRetentionProgramPayableInShares
Number of quotas for payment under LTRP |  | 8 meli_NumberOfQuotasForPaymentUnderLongTermRetentionPlan |  |  |  |  |  |
Percentage of quotas in each installment under LTRP |  | 12.50%meli_PercentageQuotasInEachInstallmentUnderLongTermRetentionPlan |  |  |  |  |  |
Percentage base for calculation of quotas under LTRP | 6.25%meli_PercentageBaseForCalculationOfQuotasUnderLongTermRetentionPlan |  |  |  |  |  |  |
Number of trading days consider for average closing stock price |  | 60 days |  |  |  |  |  |
Average closing stock price |  | $ 77.77 meli_AverageClosingStockPrice | $ 65.41 meli_AverageClosingStockPrice | $ 45.75 meli_AverageClosingStockPrice | $ 13.81 meli_AverageClosingStockPrice |  |  |
Long Term Retention Plan 2008 [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Grant-date fair market value of number of shares granted, per share |  |  |  |  |  | $ 36.8 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = meli_LongTermRetentionPlanTwoZeroZeroEightMember |  |
Long Term Retention Plan 2009 [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Long Term Retention Plan payment term |  |  |  |  |  | in 8 equal annual quotas (12.5% each) commencing on March 31, 2010 |  |
Long Term Retention Plan 2010 [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Long Term Retention Plan payment term |  |  |  |  |  | in 8 equal annual quotas (12.5% each) commencing on March 31, 2011 |  |
Long Term Retention Plan 2011 [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Long Term Retention Plan payment term |  |  |  |  |  | in 8 equal annual quotas (12.5% each) commencing on March 31, 2012 |  |
Long Term Retention Plan 2012 [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Long Term Retention Plan payment term |  |  |  |  |  | in 8 equal annual quotas (12.5% each) commencing on March 31, 2013 |  |
Long Term Retention Plan 2014 [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Long Term Retention Plan payment term | In 6 equal annual quotas (16.67% each) commencing on March 31, 2014 |  |  |  |  | In 6 equal annual quotas (16.67% each) commencing on March 31, 2015 |  |
Number of quotas for payment under LTRP |  |  |  |  |  | 6 meli_NumberOfQuotasForPaymentUnderLongTermRetentionPlan / us-gaap_PlanNameAxis = meli_LongTermRetentionPlanTwoZeroOneFourMember |  |
Percentage of quotas in each installment under LTRP |  |  |  |  |  | 16.67%meli_PercentageQuotasInEachInstallmentUnderLongTermRetentionPlan / us-gaap_PlanNameAxis = meli_LongTermRetentionPlanTwoZeroOneFourMember |  |
Percentage base for calculation of quotas under LTRP |  |  |  |  |  | 8.333%meli_PercentageBaseForCalculationOfQuotasUnderLongTermRetentionPlan / us-gaap_PlanNameAxis = meli_LongTermRetentionPlanTwoZeroOneFourMember |  |
Number of trading days consider for average closing stock price |  |  |  |  |  | 60 days |  |
Average closing stock price |  |  |  |  |  | $ 118.48 meli_AverageClosingStockPrice / us-gaap_PlanNameAxis = meli_LongTermRetentionPlanTwoZeroOneFourMember |  |
Long Term Retention Plan each quota calculation term |  |  |  |  |  | 8.333% is adjusted by multiplying the nominal amount by the average closing stock price for the last 60 trading days of the year previous to the payment date and divided by the average closing stock price for the last 60 trading days of 2012 and 2013, respectively. The average closing stock price for the 2013 and 2014 LTRP amounted to $79.57 and $118.48 ("the variable share") respectively. |  |
Long Term Retention Plan 2014 [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Percentage of quotas in each installment under LTRP |  |  |  |  |  |  | 16.67%meli_PercentageQuotasInEachInstallmentUnderLongTermRetentionPlan / us-gaap_PlanNameAxis = meli_LongTermRetentionPlanTwoZeroOneFourMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember |
Long Term Retention Plan 2013 [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Average closing stock price | 79.57 meli_AverageClosingStockPrice / us-gaap_PlanNameAxis = meli_LongTermRetentionPlanTwoZeroOneThreeMember |  |  |  |  |  |  |

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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