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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
2.25% Convertible Senior Notes Due 2019 [Member]
      
Debt Instrument [Line Items]      
Amount of the equity component $ 45,808,000us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent
/ us-gaap_LongtermDebtTypeAxis
= meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember		 [1] $ 45,808,000us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent
/ us-gaap_LongtermDebtTypeAxis
= meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember		 [1]  
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		 330,000,000us-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 1,856,000meli_ContractualCouponInterestPayable
/ us-gaap_LongtermDebtTypeAxis
= meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember		 3,733,000meli_ContractualCouponInterestPayable
/ us-gaap_LongtermDebtTypeAxis
= meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember		  
Contractual Coupon Interest Payment   (3,733,000)meli_ContractualCouponInterestPayment
/ us-gaap_LongtermDebtTypeAxis
= meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember		  
Net carrying amount $ 284,913,000meli_DebtInstrumentConvertibleCarryingAmountOfLiabilityComponent
/ us-gaap_LongtermDebtTypeAxis
= meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember		 $ 280,630,000meli_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.