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Fair Value Measurement of Assets and Liabilities - Estimated Fair Values of Money Market Funds, Short-Term and Long-Term Investments (Detail) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Fair Value Disclosures [Abstract] |  |
One year or less | $ 140,833,511 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue |
One year to two years | 123,938,339 meli_AvailableForSaleSecuritiesDebtMaturitiesOneToTwoYearsFairValue |
Two years to three years | 52,039,030 meli_AvailableForSaleSecuritiesDebtMaturitiesTwoToThreeYearsFairValue |
Three years to four years | 19,805,889 meli_AvailableForSaleSecuritiesDebtMaturitiesThreeToFourYearsFairValue |
Four years to five years | 9,481,784 meli_AvailableForSaleSecuritiesDebtMaturitiesFourToFiveYearsFairValue |
Total | $ 346,098,553 us-gaap_AvailableForSaleSecuritiesDebtSecurities | $ 75,354,552 us-gaap_AvailableForSaleSecuritiesDebtSecurities

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- Definition Available for sale securities debt maturities four to five years fair value. + References No definition available. + Details
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- Definition Available for sale securities debt maturities one to two years fair value. + References No definition available. + Details
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- Definition Available for sale securities debt maturities three to four years fair value. + References No definition available. + Details
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- Definition Available for sale securities debt maturities two to three years fair value. + References No definition available. + Details
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- Definition Fair value of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount of debt securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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