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Summary of Significant Accounting Policies (Reclassifications Out of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Unrealized gains on investments $ 4,683 $ 3,573 $ 8,991 $ 6,609
Estimated tax loss on unrealized gains on investments (14,008) (6,506) (28,663) (15,281)
Net income (loss) attributable to MercadoLibre, Inc. shareholders $ 19,463 $ (25,595) 21,184 $ 4,670
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Investments [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Unrealized gains on investments     (578)  
Estimated tax loss on unrealized gains on investments     199  
Net income (loss) attributable to MercadoLibre, Inc. shareholders     $ (379)