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Net Income per Share (Details) (USD $)
 3 Months Ended 9 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Allocation of net income available to common shareholders using the two-class method      
Net income $ 19,637,038 $ 14,057,634 $ 62,722,419
Net income available to Noncontrolling interests (2,428)     
Net income attributable to Mercadolibre, Inc corresponding to common stock before changes in non-controlling interest 19,634,610 14,057,634  
Change in redeemable amount of noncontrolling interest 316,298    (610,853)
Net income attributable to MercadoLibre, Inc. corresponding to common stock, Diluted $ 19,950,908 $ 14,057,634