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Segments - Consolidated Net Revenues by Similar Products and Services (Detail) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | $ 161,369,649 us-gaap_SalesRevenueServicesNet | $ 147,934,895 us-gaap_SalesRevenueServicesNet | $ 131,849,139 us-gaap_SalesRevenueServicesNet | $ 115,382,319 us-gaap_SalesRevenueServicesNet | $ 134,630,171 us-gaap_SalesRevenueServicesNet | $ 123,055,431 us-gaap_SalesRevenueServicesNet | $ 112,183,360 us-gaap_SalesRevenueServicesNet | $ 102,725,747 us-gaap_SalesRevenueServicesNet | $ 103,754,645 us-gaap_SalesRevenueServicesNet | $ 97,266,784 us-gaap_SalesRevenueServicesNet | $ 88,844,059 us-gaap_SalesRevenueServicesNet | $ 83,736,006 us-gaap_SalesRevenueServicesNet | $ 556,536,002 us-gaap_SalesRevenueServicesNet |  | $ 472,594,709 us-gaap_SalesRevenueServicesNet |  | $ 373,601,494 us-gaap_SalesRevenueServicesNet |
Marketplace [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  |  |  |  | 376,156,156 us-gaap_SalesRevenueServicesNet / us-gaap_ProductOrServiceAxis = meli_MarketplaceMember |  | 331,338,080 us-gaap_SalesRevenueServicesNet / us-gaap_ProductOrServiceAxis = meli_MarketplaceMember |  | 261,997,021 us-gaap_SalesRevenueServicesNet / us-gaap_ProductOrServiceAxis = meli_MarketplaceMember |
Non-marketplace [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  |  |  |  | $ 180,379,846 us-gaap_SalesRevenueServicesNet / us-gaap_ProductOrServiceAxis = meli_NonmarketplaceMember | [1] | $ 141,256,629 us-gaap_SalesRevenueServicesNet / us-gaap_ProductOrServiceAxis = meli_NonmarketplaceMember | [1] | $ 111,604,473 us-gaap_SalesRevenueServicesNet / us-gaap_ProductOrServiceAxis = meli_NonmarketplaceMember | [1]
[1] | Includes, among other things, Ad Sales, Real Estate, Motors, Financing Fees, Off-platform Payment Fees and other ancillary services.

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- Definition Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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