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2.25% Convertible Senior Notes Due 2019 (Carrying Amounts of Liability and Equity Components) (Details) (2.25% Convertible Senior Notes Due 2019 [Member], USD $) | Mar. 31, 2015 | Dec. 31, 2014 | Jun. 30, 2014
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2.25% Convertible Senior Notes Due 2019 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount of the equity component | $ 45,808,000 us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember | [1] | $ 45,808,000 us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember | [1] |
2.25% convertible senior notes due 2019 | 330,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember |  | 330,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember |  | 330,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember
Unamortized debt discount | (40,716,000)us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember | [2] | (42,844,000)us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember | [2] |
Unamortized transaction costs related to the debt component | (6,227,000)us-gaap_UnamortizedDebtIssuanceExpense / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember |  | (6,526,000)us-gaap_UnamortizedDebtIssuanceExpense / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember |  |
Contractual coupon interest accrual | 1,856,000 meli_ContractualCouponInterestPayable / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember |  | 3,733,000 meli_ContractualCouponInterestPayable / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember |  |
Contractual Coupon Interest Payment |  |  | (3,733,000)meli_ContractualCouponInterestPayment / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember |  |
Net carrying amount | $ 284,913,000 meli_DebtInstrumentConvertibleCarryingAmountOfLiabilityComponent / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember |  | $ 280,630,000 meli_DebtInstrumentConvertibleCarryingAmountOfLiabilityComponent / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember |  |
[1] | Net of $1,177 thousands of transaction costs related to the equity component of the Notes.
[2] | As of March 31, 2015, the remaining period over which the unamortized debt discount will be amortized is 4.25 years.

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