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Fair Value Measurement of Assets and Liabilities (Fair Value of Financial Assets and Liabilities Measured at Amortized Cost) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Assets
Assets	$ 285,205us-gaap_AssetsFairValueDisclosure	$ 231,485us-gaap_AssetsFairValueDisclosure
Liabilities
Liabilities	595,693us-gaap_LiabilitiesFairValueDisclosure	564,568us-gaap_LiabilitiesFairValueDisclosure
Accounts and Funds Payable [Member]
Liabilities
Liabilities	58,160us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByLiabilityClassAxis = us-gaap_AccountsPayableMember	58,006us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByLiabilityClassAxis = us-gaap_AccountsPayableMember
Funds Payable to Customers [Member]
Liabilities
Liabilities	193,188us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByLiabilityClassAxis = meli_PayablesMember	165,034us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByLiabilityClassAxis = meli_PayablesMember
Salaries and Social Security Payable [Member]
Liabilities
Liabilities	23,755us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByLiabilityClassAxis = meli_EmployeeBenefitObligationsMember	18,835us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByLiabilityClassAxis = meli_EmployeeBenefitObligationsMember
Tax Payable [Member]
Liabilities
Liabilities	23,733us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByLiabilityClassAxis = meli_IncomeTaxesPayableMember	26,013us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByLiabilityClassAxis = meli_IncomeTaxesPayableMember
Dividends Payable [Member]
Liabilities
Liabilities	4,548us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByLiabilityClassAxis = meli_AccruedDividendMember	7,330us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByLiabilityClassAxis = meli_AccruedDividendMember
Loans Payable and Other Financial Liabilities [Member]
Liabilities
Liabilities	287,745us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoansPayableMember	283,826us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoansPayableMember
Other Liabilities [Member]
Liabilities
Liabilities	4,564us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByLiabilityClassAxis = us-gaap_OtherLiabilitiesMember	5,524us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByLiabilityClassAxis = us-gaap_OtherLiabilitiesMember
Significant Other Observable Inputs (Level 2) [Member]
Assets
Assets	285,205us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	231,485us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Liabilities
Liabilities	595,693us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	564,568us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Significant Other Observable Inputs (Level 2) [Member] | Accounts and Funds Payable [Member]
Liabilities
Liabilities	58,160us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByLiabilityClassAxis = us-gaap_AccountsPayableMember	58,006us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByLiabilityClassAxis = us-gaap_AccountsPayableMember
Significant Other Observable Inputs (Level 2) [Member] | Funds Payable to Customers [Member]
Liabilities
Liabilities	193,188us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByLiabilityClassAxis = meli_PayablesMember	165,034us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByLiabilityClassAxis = meli_PayablesMember
Significant Other Observable Inputs (Level 2) [Member] | Salaries and Social Security Payable [Member]
Liabilities
Liabilities	23,755us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByLiabilityClassAxis = meli_EmployeeBenefitObligationsMember	18,835us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByLiabilityClassAxis = meli_EmployeeBenefitObligationsMember
Significant Other Observable Inputs (Level 2) [Member] | Tax Payable [Member]
Liabilities
Liabilities	23,733us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByLiabilityClassAxis = meli_IncomeTaxesPayableMember	26,013us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByLiabilityClassAxis = meli_IncomeTaxesPayableMember
Significant Other Observable Inputs (Level 2) [Member] | Dividends Payable [Member]
Liabilities
Liabilities	4,548us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByLiabilityClassAxis = meli_AccruedDividendMember	7,330us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByLiabilityClassAxis = meli_AccruedDividendMember
Significant Other Observable Inputs (Level 2) [Member] | Loans Payable and Other Financial Liabilities [Member]
Liabilities
Liabilities	287,745us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoansPayableMember	283,826us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoansPayableMember
Significant Other Observable Inputs (Level 2) [Member] | Other Liabilities [Member]
Liabilities
Liabilities	4,564us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByLiabilityClassAxis = us-gaap_OtherLiabilitiesMember	5,524us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByLiabilityClassAxis = us-gaap_OtherLiabilitiesMember
Short-Term Investments [Member]
Assets
Assets	55,756us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_ShortTermInvestmentsMember	58,475us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_ShortTermInvestmentsMember
Short-Term Investments [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets
Assets	55,756us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_ShortTermInvestmentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	58,475us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_ShortTermInvestmentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Accounts Receivable [Member]
Assets
Assets	54,054us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_AccountsReceivableMember	46,672us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_AccountsReceivableMember
Accounts Receivable [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets
Assets	54,054us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_AccountsReceivableMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	46,672us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_AccountsReceivableMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Credit Cards Receivable [Member]
Assets
Assets	133,644us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_CreditCardReceivablesMember	85,162us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_CreditCardReceivablesMember
Credit Cards Receivable [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets
Assets	133,644us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_CreditCardReceivablesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	85,162us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_CreditCardReceivablesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Prepaid Expenses [Member]
Assets
Assets	6,433us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = meli_PrepaidExpensesMember	3,458us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = meli_PrepaidExpensesMember
Prepaid Expenses [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets
Assets	6,433us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = meli_PrepaidExpensesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	3,458us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = meli_PrepaidExpensesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Other Assets [Member] | Accounts and Funds Payable [Member]
Assets
Assets	35,318us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherAssetsMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_AccountsPayableMember	37,718us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherAssetsMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_AccountsPayableMember
Other Assets [Member] | Significant Other Observable Inputs (Level 2) [Member] | Accounts and Funds Payable [Member]
Assets
Assets	$ 35,318us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByLiabilityClassAxis = us-gaap_AccountsPayableMember	$ 37,718us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByLiabilityClassAxis = us-gaap_AccountsPayableMember

X

- Definition

Fair value portion of 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 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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X

- Definition

Fair value of financial and nonfinancial obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

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