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Equity Compensation Plan and Restricted Shares - Additional Information (Detail)
12 Months Ended
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding options granted 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
1999 Stock Option and Restricted Stock Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares reserved for future issuance of common stock 4,732,400us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= meli_ThousandNineHundredAndNinetyNineStockOptionAndRestrictedStockPlanMember
Number of shares available for grant 259,457us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= meli_ThousandNineHundredAndNinetyNineStockOptionAndRestrictedStockPlanMember
2009 Equity Compensation Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares reserved for future issuance of common stock 294,529us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember