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Net Income Per Share - Allocation of Net Income Available to Common Shareholders using Two-Class Method (Detail) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Earnings Per Share [Abstract]    
Net income $ 30,327,953 $ 17,522,591
Net loss (income) attributable to noncontrolling interests (63,980) (42,338)
Change in redeemable amount of noncontrolling interest 60,679 215,960
Net income attributable to MercadoLibre, Inc. Shareholders corresponding to common stock, Basic 30,324,652 17,696,213
Net income attributable to MercadoLibre, Inc. Shareholders corresponding to common stock, Diluted $ 30,324,652 $ 17,696,213