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Long Term Retention Plan - Additional Information (Detail) (USD $)
 12 Months Ended 0 Months Ended
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   8meli_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   $ 77.77meli_AverageClosingStockPrice $ 65.41meli_AverageClosingStockPrice $ 45.75meli_AverageClosingStockPrice $ 13.81meli_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           $ 36.8us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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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           6meli_NumberOfQuotasForPaymentUnderLongTermRetentionPlan
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Percentage of quotas in each installment under LTRP           16.67%meli_PercentageQuotasInEachInstallmentUnderLongTermRetentionPlan
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Percentage base for calculation of quotas under LTRP           8.333%meli_PercentageBaseForCalculationOfQuotasUnderLongTermRetentionPlan
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Number of trading days consider for average closing stock price           60 days    
Average closing stock price           $ 118.48meli_AverageClosingStockPrice
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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
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Long Term Retention Plan 2013 [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Average closing stock price 79.57meli_AverageClosingStockPrice
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