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Segment Reporting (Consolidated Net Revenues by Similar Products and Services) (Details) (USD $) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Net revenues | $ 148,103,000 us-gaap_SalesRevenueServicesNet |  | $ 115,382,000 us-gaap_SalesRevenueServicesNet |
Marketplace [Member] |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Net revenues | 94,762,000 us-gaap_SalesRevenueServicesNet / us-gaap_ProductOrServiceAxis = meli_MarketplaceMember |  | 83,442,000 us-gaap_SalesRevenueServicesNet / us-gaap_ProductOrServiceAxis = meli_MarketplaceMember |
Non-marketplace [Member] |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Net revenues | $ 53,341,000 us-gaap_SalesRevenueServicesNet / us-gaap_ProductOrServiceAxis = meli_NonmarketplaceMember | [1] | $ 31,940,000 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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Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |