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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