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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 | $ 7,329,546 us-gaap_DividendsCommonStockCash | $ 6,313,869 us-gaap_DividendsCommonStockCash | $ 4,812,396 us-gaap_DividendsCommonStockCash | $ 29,318,184 us-gaap_DividendsCommonStockCash | $ 25,255,478 us-gaap_DividendsCommonStockCash | $ 19,249,040 us-gaap_DividendsCommonStockCash |
Cash dividend distribution, per share | $ 0.166 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.143 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.109 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.664 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.572 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.436 us-gaap_CommonStockDividendsPerShareCashPaid |
Cash dividend declared, per share |  |  |  | $ 0.664 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.572 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.436 us-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 |  |  |  |  |  |  | $ 4,596,284 meli_CommonStockDividendsDeclared / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Cash dividend declared, per share |  |  |  |  |  |  | $ 0.103 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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- Definition 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 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Aggregate dividends declared 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 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash. + 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 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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