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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		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share [Abstract]
Net income (loss)	$ (25,588,478)	$ 30,021,018	$ 4,739,475	$ 47,543,609
Net loss (income) attributable to noncontrolling interests	(5,552)	(42,377)	(69,532)	(84,715)
Change in redeemable amount of noncontrolling interest	(121,046)	(349,911)	3,615	(133,951)
Net income (loss) attributable to MercadoLibre, Inc. Shareholders corresponding to common stock, Basic	(25,715,076)	29,628,730	4,673,558	47,324,943
Net income (loss)	(25,588,478)	30,021,018	4,739,475	47,543,609
Net loss (income) attributable to noncontrolling interests	(5,552)	(42,377)	(69,532)	(84,715)
Change in redeemable amount of noncontrolling interest	(121,046)	(349,911)	3,615	(133,951)
Net income (loss) attributable to MercadoLibre, Inc. Shareholders corresponding to common stock, Diluted	$ (25,715,076)	$ 29,628,730	$ 4,673,558	$ 47,324,943

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Net Increase or Decrease in balance of noncontrolling interest in the subsidiary during the reporting period.

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Amount of Net Income (Loss) attributable to noncontrolling interest.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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