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Balance Sheet Components - Summary of Changes Accumulated Balances of Other Comprehensive Income (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Beginning balance | $ (11,159)meli_AccumulatedOtherComprehensiveIncomeLossTax |  |
Amount of gain (loss) reclassified from accumulated other comprehensive income to net income, tax | 11,159 meli_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodTax |  |
Net current period other comprehensive income, tax | 210,274 us-gaap_OtherComprehensiveIncomeLossTax |  |
Ending balance | 199,115 meli_AccumulatedOtherComprehensiveIncomeLossTax | (11,159)meli_AccumulatedOtherComprehensiveIncomeLossTax |
Beginning balance | (87,455,970)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (48,783,128)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (48,783,128)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Amount of gain (loss) reclassified from accumulated other comprehensive income to net income, net of tax | (25,467)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax | (759,564)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax | (924,657)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Net current period other comprehensive income, net of tax | (47,617,861)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | (38,672,842)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | (11,739,782)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Ending balance | (135,073,831)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (87,455,970)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (48,783,128)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Unrealized Gains (Losses) on Investments [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Beginning balance | 36,626 us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1 / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |
Amount of gain (loss) reclassified from accumulated other comprehensive income to net income, before tax | (36,626)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |
Net current period other comprehensive income, before tax | (614,133)us-gaap_OtherComprehensiveIncomeLossBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |
Ending balance | (577,507)us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1 / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |
Foreign Currency Translation [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Beginning balance | (87,481,437)us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1 / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |  |
Net current period other comprehensive income, before tax | (47,214,002)us-gaap_OtherComprehensiveIncomeLossBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |  |
Ending balance | (134,695,439)us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1 / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |  |
Available-for-sale Securities [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other comprehensive income before reclassification adjustments for (losses) gains on available for sale investments, tax | 199,115 meli_OtherComprehensiveIncomeLossBeforeReclassificationAdjustmentTax / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_AvailableforsaleSecuritiesMember |  |
Other comprehensive income before reclassification adjustments for (losses) gains on available for sale investments, net of tax | (47,592,394)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_AvailableforsaleSecuritiesMember | (37,913,278)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_AvailableforsaleSecuritiesMember |
Available-for-sale Securities [Member] | Unrealized Gains (Losses) on Investments [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other comprehensive income before reclassification adjustments for (losses) gains on available for sale investments, before tax | (577,507)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |
Available-for-sale Securities [Member] | Foreign Currency Translation [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other comprehensive income before reclassification adjustments for (losses) gains on available for sale investments, before tax | $ (47,214,002)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |  |

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