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2.25% Convertible Senior Notes Due 2019 - Carrying Amounts of Liability and Equity Components (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Jun. 30, 2014
Debt Instrument [Line Items]
Contractual coupon interest accrual	$ 3,733,125meli_ContractualCouponInterestExpense
2.25% Convertible Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Amount of the equity component	45,807,685us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember
2.25% convertible senior notes due 2019	330,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember	330,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember
Unamortized debt discount	(42,843,705)us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember
Unamortized transaction costs related to the debt component	(6,526,037)us-gaap_UnamortizedDebtIssuanceExpense / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember
Contractual coupon interest accrual	3,733,125meli_ContractualCouponInterestExpense / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember
Contractual coupon interest payment	(3,733,125)meli_ContractualCouponInterestPayment / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember
Net carrying amount	$ 280,630,258meli_DebtInstrumentConvertibleCarryingAmountOfLiabilityComponent / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember

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- Definition

Contractual coupon interest expense.

+ References

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- Definition

Contractual coupon interest payment.

+ References

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- Definition

Debt Instrument Convertible Carrying Amount Of Liability Component

+ References

No definition available.

+ Details

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Namespace Prefix:	meli_
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- Definition

The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031897-161870

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

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- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 1A

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399



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-Publisher FASB

-Name Accounting Standards Codification

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-Section 55

-Paragraph 8

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- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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