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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
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Earnings Per Share [Abstract] |  |  |  |
Net income | $ 30,021,018 | $ 25,394,824 | $ 47,543,609 | $ 45,031,862
Net income attributable to noncontrolling interests | (42,377) | (15,632) | (84,715) | (18,060)
Change in redeemable amount of noncontrolling interest | (349,911) | (179,098) | (133,951) | 137,200
Net income attributable to MercadoLibre, Inc. Shareholders corresponding to common stock, Basic | 29,628,730 | 25,200,094 | 47,324,943 | 45,151,002
Net income attributable to MercadoLibre, Inc. Shareholders corresponding to common stock, Diluted | $ 29,628,730 | $ 25,200,094 | $ 47,324,943 | $ 45,151,002

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