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Net Income Per Share - Net Income Per Share of Common Stock (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Net income attributable to MercadoLibre, Inc. per common share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to MercadoLibre, Inc. per common share, Basic | $ 0.76 us-gaap_EarningsPerShareBasic | $ 0.76 us-gaap_EarningsPerShareBasic | $ (0.58)us-gaap_EarningsPerShareBasic | $ 0.69 us-gaap_EarningsPerShareBasic | $ 0.93 us-gaap_EarningsPerShareBasic | $ 0.66 us-gaap_EarningsPerShareBasic | $ 0.67 us-gaap_EarningsPerShareBasic | $ 0.40 us-gaap_EarningsPerShareBasic | $ 0.69 us-gaap_EarningsPerShareBasic | $ 0.59 us-gaap_EarningsPerShareBasic | $ 0.57 us-gaap_EarningsPerShareBasic | $ 0.45 us-gaap_EarningsPerShareBasic | $ 1.63 us-gaap_EarningsPerShareBasic | $ 2.66 us-gaap_EarningsPerShareBasic | $ 2.30 us-gaap_EarningsPerShareBasic
Net income attributable to MercadoLibre, Inc. per common share, Diluted | $ 0.76 us-gaap_EarningsPerShareDiluted | $ 0.76 us-gaap_EarningsPerShareDiluted | $ (0.58)us-gaap_EarningsPerShareDiluted | $ 0.69 us-gaap_EarningsPerShareDiluted | $ 0.93 us-gaap_EarningsPerShareDiluted | $ 0.66 us-gaap_EarningsPerShareDiluted | $ 0.67 us-gaap_EarningsPerShareDiluted | $ 0.40 us-gaap_EarningsPerShareDiluted | $ 0.69 us-gaap_EarningsPerShareDiluted | $ 0.59 us-gaap_EarningsPerShareDiluted | $ 0.57 us-gaap_EarningsPerShareDiluted | $ 0.45 us-gaap_EarningsPerShareDiluted | $ 1.63 us-gaap_EarningsPerShareDiluted | $ 2.66 us-gaap_EarningsPerShareDiluted | $ 2.30 us-gaap_EarningsPerShareDiluted
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to MercadoLibre, Inc., Basic |  |  |  |  |  |  |  |  |  |  |  |  | $ 72,145,834 meli_NetIncomeAttributableToCommonStockHoldersBasic | $ 117,517,082 meli_NetIncomeAttributableToCommonStockHoldersBasic | $ 101,606,696 meli_NetIncomeAttributableToCommonStockHoldersBasic
Net income attributable to MercadoLibre, Inc., Diluted |  |  |  |  |  |  |  |  |  |  |  |  | $ 72,145,834 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 117,517,082 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 101,606,696 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average of common stock outstanding for Basic earnings per share | 44,154,412 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 44,153,892 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 44,153,892 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 44,153,818 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 44,153,185 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 44,152,933 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 44,152,933 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 44,151,323 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 44,150,920 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 44,150,387 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 44,147,999 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 44,142,076 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 44,153,884 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 44,152,600 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 44,147,861 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Adjustment for stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,977 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Adjusted weighted average of common stock outstanding for Diluted earnings per share | 44,154,412 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 44,153,892 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 44,182,668 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 44,153,818 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 44,153,185 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 44,152,933 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 44,152,933 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 44,151,357 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 44,152,895 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 44,157,321 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 44,152,133 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 44,147,796 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 44,153,884 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 44,152,600 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 44,149,838 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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