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Cash Dividend Distribution - Additional Information (Detail) (USD $)	0 Months Ended			12 Months Ended			0 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 24, 2015
Dividends Payable [Line Items]
Cash dividend distribution	$ 7,329,546us-gaap_DividendsCommonStockCash	$ 6,313,869us-gaap_DividendsCommonStockCash	$ 4,812,396us-gaap_DividendsCommonStockCash	$ 29,318,184us-gaap_DividendsCommonStockCash	$ 25,255,478us-gaap_DividendsCommonStockCash	$ 19,249,040us-gaap_DividendsCommonStockCash
Cash dividend distribution, per share	$ 0.166us-gaap_CommonStockDividendsPerShareCashPaid	$ 0.143us-gaap_CommonStockDividendsPerShareCashPaid	$ 0.109us-gaap_CommonStockDividendsPerShareCashPaid	$ 0.664us-gaap_CommonStockDividendsPerShareCashPaid	$ 0.572us-gaap_CommonStockDividendsPerShareCashPaid	$ 0.436us-gaap_CommonStockDividendsPerShareCashPaid
Cash dividend declared, per share				$ 0.664us-gaap_CommonStockDividendsPerShareDeclared	$ 0.572us-gaap_CommonStockDividendsPerShareDeclared	$ 0.436us-gaap_CommonStockDividendsPerShareDeclared
Fiscal Year 2014 [Member]
Dividends Payable [Line Items]
Dividend paid date				Jan. 15, 2015
Dividends payment, Date of Record				Dec. 31, 2014
Fiscal Year 2013 [Member]
Dividends Payable [Line Items]
Dividend paid date				Jan. 15, 2014
Fiscal Year 2012 [Member]
Dividends Payable [Line Items]
Dividend paid date				Jan. 15, 2013
Subsequent Events [Member]
Dividends Payable [Line Items]
Dividend paid date							Apr. 15, 2015
Dividends payment, Date of Record							Mar. 31, 2015
Cash dividend declared							$ 4,596,284meli_CommonStockDividendsDeclared / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Cash dividend declared, per share							$ 0.103us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

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-Section 04

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 230

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-Publisher SEC

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-Article 3



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