Condensed Consolidated Statements of Income (Unaudited) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Condensed Consolidated Statements of Income [Abstract]
Net revenues	$ 81,628,144	$ 55,951,378	$ 212,465,972	$ 154,399,483
Cost of net revenues	(20,060,474)	(11,450,919)	(51,331,295)	(32,755,531)
Gross profit	61,567,670	44,500,459	161,134,677	121,643,952
Operating expenses:
Product and technology development	(5,925,019)	(4,224,476)	(16,600,802)	(11,425,716)
Sales and marketing	(16,701,982)	(12,281,672)	(45,567,338)	(34,863,616)
General and administrative	(8,976,946)	(8,683,605)	(28,160,262)	(21,725,081)
Total operating expenses	(31,603,947)	(25,189,753)	(90,328,402)	(68,014,413)
Income from operations	29,963,723	19,310,706	70,806,275	53,629,539
Other income (expenses):
Interest income and other financial gains	2,913,596	1,361,899	7,037,264	3,073,427
Interest expense and other financial charges	(1,052,865)	(567,969)	(2,562,633)	(6,919,307)
Foreign currency gain / (loss)	3,284,190	(354,219)	2,080,822	7,275
Other income / (loss), net	(7,292)		253,148
Net income before income / asset tax expense	35,101,352	19,750,417	77,614,876	49,790,934
Income / asset tax expense	(8,804,905)	(959,454)	(22,439,967)	(9,705,408)
Net income	26,296,447	18,790,963	55,174,909	40,085,526
Less: Net Income attributable to Noncontrolling Interests	522		522
Net income attributable to MercadoLibre, Inc	$ 26,295,925	$ 18,790,963	$ 55,174,387	$ 40,085,526
Basic EPS
Basic net income attributable to MercadoLibre, Inc. per common share	$ 0.60	$ 0.43	$ 1.25	$ 0.91
Weighted average shares	44,141,925	44,129,762	44,137,176	44,121,539
Diluted EPS
Diluted net income attributable to MercadoLibre, Inc. per common share	$ 0.60	$ 0.43	$ 1.25	$ 0.91
Weighted average shares	44,151,218	44,151,367	44,150,872	44,144,678