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2.25% Convertible Senior Notes Due 2019 (Summary of Interest Expense for Contractual Interest and Accretion of Debt Discount) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
2.25% Convertible Senior Notes Due 2019 [Abstract]
Contractual coupon interest expense	$ 1,856meli_ContractualCouponInterestExpense
Amortization of debt discount	2,128us-gaap_AmortizationOfDebtDiscountPremium
Amortization of debt issuance costs	299us-gaap_AmortizationOfFinancingCosts
Total interest expense related to Notes	$ 4,283us-gaap_InterestExpenseDebt

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Contractual coupon interest expense.

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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