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Subsequent Events - Additional Information (Detail) (Subsequent Events [Member])
Feb. 12, 2015
Feb. 28, 2015
Simadi [Member]
   
Subsequent Event [Line Items]    
Foreign exchange rate 170.04us-gaap_ForeignCurrencyExchangeRateTranslation1
/ us-gaap_InformationByFinancialStatementLineItemAxis
= meli_SimadiMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
IPO [Member] | Sicad [Member]
   
Subsequent Event [Line Items]    
Foreign exchange rate   12us-gaap_ForeignCurrencyExchangeRateTranslation1
/ us-gaap_InformationByFinancialStatementLineItemAxis
= meli_SicadMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember