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Summary of Significant Accounting Policies (Reclassifications Out of Accumulated Other Comprehensive Income) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Unrealized gains on investments $ 4,308us-gaap_InvestmentIncomeInterest $ 3,036us-gaap_InvestmentIncomeInterest
Estimated tax loss on unrealized gains on investments (14,655)us-gaap_IncomeTaxExpenseBenefit (8,775)us-gaap_IncomeTaxExpenseBenefit
Net income attributable to MercadoLibre, Inc. shareholders 1,721us-gaap_NetIncomeLoss 30,264us-gaap_NetIncomeLoss
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Investments [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Unrealized gains on investments (578)us-gaap_InvestmentIncomeInterest
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		  
Estimated tax loss on unrealized gains on investments 199us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		  
Net income attributable to MercadoLibre, Inc. shareholders $ (379)us-gaap_NetIncomeLoss
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember