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Long Term Retention Plan - Summary of Option Activity (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Outstanding LTRP 2009 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate Intrinsic value	$ 3,229,139us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = meli_OutstandingLongTermRetentionPlanTwoZeroZeroNineMember	$ 4,305,518us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = meli_OutstandingLongTermRetentionPlanTwoZeroZeroNineMember	$ 3,854,742us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = meli_OutstandingLongTermRetentionPlanTwoZeroZeroNineMember
Weighted-average remaining contractual life (years)	1 year 3 months	1 year 9 months	2 years 3 months
Outstanding LTRP 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate Intrinsic value	2,307,641us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = meli_OutstandingLongTermRetentionTwoZeroOneZeroMember	2,884,551us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = meli_OutstandingLongTermRetentionTwoZeroOneZeroMember	3,461,461us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = meli_OutstandingLongTermRetentionTwoZeroOneZeroMember
Weighted-average remaining contractual life (years)	1 year 9 months	2 years 3 months	2 years 9 months
Outstanding LTRP 2011 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate Intrinsic value	3,624,856us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = meli_OutstandingLongTermRetentionPlanTwoZeroOneOneMember	4,093,119us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = meli_OutstandingLongTermRetentionPlanTwoZeroOneOneMember	3,288,647us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = meli_OutstandingLongTermRetentionPlanTwoZeroOneOneMember
Weighted-average remaining contractual life (years)	2 years 3 months	2 years 9 months	3 years 3 months
Outstanding LTRP 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate Intrinsic value	4,354,116us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = meli_OutstandingLongTermRetentionPlanTwoZeroOneTwoMember	4,806,997us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = meli_OutstandingLongTermRetentionPlanTwoZeroOneTwoMember	3,800,492us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = meli_OutstandingLongTermRetentionPlanTwoZeroOneTwoMember
Weighted-average remaining contractual life (years)	2 years 8 months 27 days	3 years 3 months	3 years 9 months
Outstanding LTRP 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate Intrinsic value	9,005,706us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = meli_OutstandingLongTermRetentionPlanTwoZeroOneThreeMember	10,167,959us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = meli_OutstandingLongTermRetentionPlanTwoZeroOneThreeMember
Weighted-average remaining contractual life (years)	2 years 3 months	2 years 9 months
Outstanding LTRP 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate Intrinsic value	$ 7,525,925us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = meli_OutstandingLongTermRetentionPlanTwoZeroOneFourMember
Weighted-average remaining contractual life (years)	2 years 8 months 27 days

X

- Definition

Intrinsic value of equity-based compensation awards not vested. Excludes stock and unit options.

+ References

No definition available.

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- Definition

Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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