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Summary of Significant Accounting Policies - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Unrealized gains on investments | $ 3,572,917 | $ 2,202,314 | $ 6,608,546 | $ 5,596,320
Estimated tax loss on unrealized gains on investments | (6,505,879) | (10,701,182) | (15,280,934) | (18,529,981)
Net income (loss) attributable to MercadoLibre, Inc. shareholders | (25,594,030) | 29,978,641 | 4,669,943 | 47,458,894
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains on Investments [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Unrealized gains on investments | 36,626 |  |  |
Estimated tax loss on unrealized gains on investments | (11,159) |  |  |
Net income (loss) attributable to MercadoLibre, Inc. shareholders | $ 25,467 |  |  |

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