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2.25% Convertible Senior Notes Due 2019 - Summary of Interest Expense for Contractual Interest and Accretion of Debt Discount and Amortization of Debt Issuance Costs (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Contractual coupon interest expense	$ 3,733,125meli_ContractualCouponInterestExpense
Amortization of debt discount	4,141,170us-gaap_AmortizationOfDebtDiscountPremium
Amortization of debt issuance costs	568,559us-gaap_AmortizationOfFinancingCosts
Total interest expense related to Notes	$ 8,442,854us-gaap_InterestExpenseDebt

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- Definition

Contractual coupon interest expense.

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- Definition

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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

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

-Publisher FASB

-Name Accounting Standards Codification

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

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-Name Accounting Standards Codification

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