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Compensation Plan for Outside Directors - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Jun. 09, 2013	Jun. 09, 2012	Dec. 31, 2011	Jun. 09, 2011
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Non-Adjustable Board Service Award, cash payment	$ 50,000meli_PaymentsForNonAdjustableBoardServiceAward	$ 43,826meli_PaymentsForNonAdjustableBoardServiceAward	$ 37,703meli_PaymentsForNonAdjustableBoardServiceAward		$ 32,436meli_PaymentsForNonAdjustableBoardServiceAward
Adjustable Award of company's share	70,000meli_FixedCashAmountUsedForCalculatingAdjustableAward	58,435meli_FixedCashAmountUsedForCalculatingAdjustableAward	50,271meli_FixedCashAmountUsedForCalculatingAdjustableAward		43,248meli_FixedCashAmountUsedForCalculatingAdjustableAward
Trading day period	30 days			30 days
Audit Committee [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Annual cash compensation to outside directors in addition to existing director amount	21,913meli_AnnualCashCompensationToOutsideDirectorsInAdditionToExistingDirectorAmount / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = meli_AuditCommitteeMember	21,913meli_AnnualCashCompensationToOutsideDirectorsInAdditionToExistingDirectorAmount / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = meli_AuditCommitteeMember	18,852meli_AnnualCashCompensationToOutsideDirectorsInAdditionToExistingDirectorAmount / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = meli_AuditCommitteeMember		16,218meli_AnnualCashCompensationToOutsideDirectorsInAdditionToExistingDirectorAmount / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = meli_AuditCommitteeMember
Compensation Committee [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Annual cash compensation to outside directors in addition to existing director amount	17,531meli_AnnualCashCompensationToOutsideDirectorsInAdditionToExistingDirectorAmount / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = meli_CompensationCommitteeMember	17,531meli_AnnualCashCompensationToOutsideDirectorsInAdditionToExistingDirectorAmount / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = meli_CompensationCommitteeMember	15,081meli_AnnualCashCompensationToOutsideDirectorsInAdditionToExistingDirectorAmount / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = meli_CompensationCommitteeMember		12,974meli_AnnualCashCompensationToOutsideDirectorsInAdditionToExistingDirectorAmount / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = meli_CompensationCommitteeMember
Nominating Committee [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Annual cash compensation to outside directors in addition to existing director amount	7,304meli_AnnualCashCompensationToOutsideDirectorsInAdditionToExistingDirectorAmount / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = meli_NominatingCommitteeMember	7,304meli_AnnualCashCompensationToOutsideDirectorsInAdditionToExistingDirectorAmount / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = meli_NominatingCommitteeMember	6,284meli_AnnualCashCompensationToOutsideDirectorsInAdditionToExistingDirectorAmount / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = meli_NominatingCommitteeMember		5,406meli_AnnualCashCompensationToOutsideDirectorsInAdditionToExistingDirectorAmount / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = meli_NominatingCommitteeMember
Lead Independent Director [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Annual cash compensation to outside directors in addition to existing director amount		14,609meli_AnnualCashCompensationToOutsideDirectorsInAdditionToExistingDirectorAmount / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = meli_LeadIndependentDirectorMember	12,568meli_AnnualCashCompensationToOutsideDirectorsInAdditionToExistingDirectorAmount / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = meli_LeadIndependentDirectorMember		10,812meli_AnnualCashCompensationToOutsideDirectorsInAdditionToExistingDirectorAmount / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = meli_LeadIndependentDirectorMember
Corporate Governance Committee [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Annual cash compensation to outside directors in addition to existing director amount	$ 14,609meli_AnnualCashCompensationToOutsideDirectorsInAdditionToExistingDirectorAmount / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = meli_CorporateGovernanceCommitteeMember

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