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Summary of Significant Accounting Policies (Assets, Liabilities and Net Assets of Company's Venezuelan Subsidiaries) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Significant Accounting Policies [Line Items]
Net revenues	$ 148,103,000us-gaap_SalesRevenueServicesNet	$ 115,382,000us-gaap_SalesRevenueServicesNet
Assets	976,783,000us-gaap_Assets		966,848,000us-gaap_Assets
Liabilities	(645,665,000)us-gaap_Liabilities		(611,060,000)us-gaap_Liabilities
Venezuelan Operations [Member]
Significant Accounting Policies [Line Items]
Net revenues	13,955us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = meli_VenezuelanSubsidiaryMember	19,357us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = meli_VenezuelanSubsidiaryMember
Assets	41,587us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = meli_VenezuelanSubsidiaryMember		75,153us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = meli_VenezuelanSubsidiaryMember
Liabilities	(38,565)us-gaap_Liabilities / us-gaap_StatementBusinessSegmentsAxis = meli_VenezuelanSubsidiaryMember		(43,359)us-gaap_Liabilities / us-gaap_StatementBusinessSegmentsAxis = meli_VenezuelanSubsidiaryMember
Net Assets	$ 3,022us-gaap_AssetsNet / us-gaap_StatementBusinessSegmentsAxis = meli_VenezuelanSubsidiaryMember		$ 31,794us-gaap_AssetsNet / us-gaap_StatementBusinessSegmentsAxis = meli_VenezuelanSubsidiaryMember

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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.

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Amount of net assets (liabilities).

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Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

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