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Segments - Consolidated Net Revenues by Similar Products and Services (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
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	$ 161,369,649us-gaap_SalesRevenueServicesNet	$ 147,934,895us-gaap_SalesRevenueServicesNet	$ 131,849,139us-gaap_SalesRevenueServicesNet	$ 115,382,319us-gaap_SalesRevenueServicesNet	$ 134,630,171us-gaap_SalesRevenueServicesNet	$ 123,055,431us-gaap_SalesRevenueServicesNet	$ 112,183,360us-gaap_SalesRevenueServicesNet	$ 102,725,747us-gaap_SalesRevenueServicesNet	$ 103,754,645us-gaap_SalesRevenueServicesNet	$ 97,266,784us-gaap_SalesRevenueServicesNet	$ 88,844,059us-gaap_SalesRevenueServicesNet	$ 83,736,006us-gaap_SalesRevenueServicesNet	$ 556,536,002us-gaap_SalesRevenueServicesNet		$ 472,594,709us-gaap_SalesRevenueServicesNet		$ 373,601,494us-gaap_SalesRevenueServicesNet
Marketplace [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues													376,156,156us-gaap_SalesRevenueServicesNet / us-gaap_ProductOrServiceAxis = meli_MarketplaceMember		331,338,080us-gaap_SalesRevenueServicesNet / us-gaap_ProductOrServiceAxis = meli_MarketplaceMember		261,997,021us-gaap_SalesRevenueServicesNet / us-gaap_ProductOrServiceAxis = meli_MarketplaceMember
Non-marketplace [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues													$ 180,379,846us-gaap_SalesRevenueServicesNet / us-gaap_ProductOrServiceAxis = meli_NonmarketplaceMember	[1]	$ 141,256,629us-gaap_SalesRevenueServicesNet / us-gaap_ProductOrServiceAxis = meli_NonmarketplaceMember	[1]	$ 111,604,473us-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.

X

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_ProductOrServiceAxis=meli_MarketplaceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ProductOrServiceAxis=meli_NonmarketplaceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: