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Segment Reporting (Consolidated Net Revenues by Similar Products and Services) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	$ 355,281	$ 304,921	$ 1,011,634	$ 858,479
Enchanced Marketplace [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	180,319	181,140	477,216	539,079
Non-marketplace [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	174,962	123,781	534,418	319,400
Payment fees	$ 143,925	$ 92,254	$ 432,603	$ 232,426

X

- Definition

Payment Fees

+ References

No definition available.

+ Details

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Namespace Prefix:	meli_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ 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)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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Namespace Prefix:
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- Details

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