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Fair Value Measurement of Assets and Liabilities - Estimated Fair Values of Money Market Funds, Short-Term and Long-Term Investments (Detail) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Fair Value Disclosures [Abstract]    
One year or less $ 140,833,511us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue  
One year to two years 123,938,339meli_AvailableForSaleSecuritiesDebtMaturitiesOneToTwoYearsFairValue  
Two years to three years 52,039,030meli_AvailableForSaleSecuritiesDebtMaturitiesTwoToThreeYearsFairValue  
Three years to four years 19,805,889meli_AvailableForSaleSecuritiesDebtMaturitiesThreeToFourYearsFairValue  
Four years to five years 9,481,784meli_AvailableForSaleSecuritiesDebtMaturitiesFourToFiveYearsFairValue  
Total $ 346,098,553us-gaap_AvailableForSaleSecuritiesDebtSecurities $ 75,354,552us-gaap_AvailableForSaleSecuritiesDebtSecurities