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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
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Mar. 31, 2015 | Mar. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Unrealized gains on investments | $ 4,308 us-gaap_InvestmentIncomeInterest | $ 3,036 us-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 | 1,721 us-gaap_NetIncomeLoss | 30,264 us-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 | 199 us-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 |

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