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Balance sheet components - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains on investments |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,335,853 us-gaap_InvestmentIncomeInterest | $ 10,668,593 us-gaap_InvestmentIncomeInterest | $ 11,877,375 us-gaap_InvestmentIncomeInterest
Estimated tax loss on unrealized gains on investments |  |  |  |  |  |  |  |  |  |  |  |  | (49,143,050)us-gaap_IncomeTaxExpenseBenefit | (45,583,181)us-gaap_IncomeTaxExpenseBenefit | (38,871,379)us-gaap_IncomeTaxExpenseBenefit
Net income attributable to MercadoLibre, Inc. shareholders | 34,161,329 us-gaap_NetIncomeLoss | 33,751,967 us-gaap_NetIncomeLoss | (25,588,478)us-gaap_NetIncomeLoss | 30,327,953 us-gaap_NetIncomeLoss | 40,836,407 us-gaap_NetIncomeLoss | 29,146,247 us-gaap_NetIncomeLoss | 30,021,018 us-gaap_NetIncomeLoss | 17,522,591 us-gaap_NetIncomeLoss | 30,246,388 us-gaap_NetIncomeLoss | 26,067,897 us-gaap_NetIncomeLoss | 25,394,824 us-gaap_NetIncomeLoss | 19,637,038 us-gaap_NetIncomeLoss | 72,580,551 us-gaap_NetIncomeLoss | 117,507,438 us-gaap_NetIncomeLoss | 101,247,298 us-gaap_NetIncomeLoss
Unrealized Gains (Losses) on Investments [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains on investments |  |  |  |  |  |  |  |  |  |  |  |  | 36,626 us-gaap_InvestmentIncomeInterest / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |
Estimated tax loss on unrealized gains on investments |  |  |  |  |  |  |  |  |  |  |  |  | (11,159)us-gaap_IncomeTaxExpenseBenefit / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |
Net income attributable to MercadoLibre, Inc. shareholders |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,467 us-gaap_NetIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |

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