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Summary of Significant Accounting Policies - Assets, Liabilities and Net Assets of Company's Venezuelan Subsidiaries (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Significant Accounting Policies [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
Assets | 966,847,735 us-gaap_Assets |  |  |  | 592,362,773 us-gaap_Assets |  |  |  |  |  |  |  | 966,847,735 us-gaap_Assets | 592,362,773 us-gaap_Assets |
Liabilities | (611,059,325)us-gaap_Liabilities |  |  |  | (244,879,165)us-gaap_Liabilities |  |  |  |  |  |  |  | (611,059,325)us-gaap_Liabilities | (244,879,165)us-gaap_Liabilities |
Venezuelan Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  |  |  |  | 58,025,886 us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = meli_VenezuelanSubsidiaryMember | 84,572,485 us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = meli_VenezuelanSubsidiaryMember | 54,676,170 us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = meli_VenezuelanSubsidiaryMember
Assets | 75,152,574 us-gaap_Assets / dei_LegalEntityAxis = meli_VenezuelanSubsidiaryMember |  |  |  | 126,873,804 us-gaap_Assets / dei_LegalEntityAxis = meli_VenezuelanSubsidiaryMember |  |  |  |  |  |  |  | 75,152,574 us-gaap_Assets / dei_LegalEntityAxis = meli_VenezuelanSubsidiaryMember | 126,873,804 us-gaap_Assets / dei_LegalEntityAxis = meli_VenezuelanSubsidiaryMember |
Liabilities | (43,358,945)us-gaap_Liabilities / dei_LegalEntityAxis = meli_VenezuelanSubsidiaryMember |  |  |  | (62,437,338)us-gaap_Liabilities / dei_LegalEntityAxis = meli_VenezuelanSubsidiaryMember |  |  |  |  |  |  |  | (43,358,945)us-gaap_Liabilities / dei_LegalEntityAxis = meli_VenezuelanSubsidiaryMember | (62,437,338)us-gaap_Liabilities / dei_LegalEntityAxis = meli_VenezuelanSubsidiaryMember |
Net Assets | $ 31,793,629 us-gaap_AssetsNet / dei_LegalEntityAxis = meli_VenezuelanSubsidiaryMember |  |  |  | $ 64,436,466 us-gaap_AssetsNet / dei_LegalEntityAxis = meli_VenezuelanSubsidiaryMember |  |  |  |  |  |  |  | $ 31,793,629 us-gaap_AssetsNet / dei_LegalEntityAxis = meli_VenezuelanSubsidiaryMember | $ 64,436,466 us-gaap_AssetsNet / dei_LegalEntityAxis = meli_VenezuelanSubsidiaryMember |

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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