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Fair Value Measurement of Assets and Liabilities (Estimated Fair Values of Money Market Funds, Short-Term and Long-Term Investments) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Fair Value Measurement of Assets and Liabilities [Abstract]    
One year or less $ 141,307us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue  
One year to two years 120,358meli_AvailableForSaleSecuritiesDebtMaturitiesOneToTwoYearsFairValue  
Two years to three years 42,660meli_AvailableForSaleSecuritiesDebtMaturitiesTwoToThreeYearsFairValue  
Three years to four years 15,147meli_AvailableForSaleSecuritiesDebtMaturitiesThreeToFourYearsFairValue  
Four years to five years 11,987meli_AvailableForSaleSecuritiesDebtMaturitiesFourToFiveYearsFairValue  
Total $ 331,459us-gaap_AvailableForSaleSecuritiesDebtSecurities $ 346,099us-gaap_AvailableForSaleSecuritiesDebtSecurities