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Compensation Plan for Outside Directors - Summary of Total Accrued Compensation Cost Related to Outside Directors (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Accrued compensation cost related to outside Directors, Total | $ 964,743 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense | $ 953,638 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense | $ 582,562 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
Chairman Fee [Member] |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Accrued compensation cost related to outside Directors, Total | 61,357 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_AwardTypeAxis = meli_ChairmanFeeMember | 55,858 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_AwardTypeAxis = meli_ChairmanFeeMember | 57,680 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_AwardTypeAxis = meli_ChairmanFeeMember
Adjustable Award [Member] |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Accrued compensation cost related to outside Directors, Total | 544,756 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_AwardTypeAxis = meli_AdjustableAwardMember | 575,242 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_AwardTypeAxis = meli_AdjustableAwardMember | 282,703 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_AwardTypeAxis = meli_AdjustableAwardMember
Non-adjustable Award [Member] |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Accrued compensation cost related to outside Directors, Total | $ 358,630 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_AwardTypeAxis = meli_NonAdjustableAwardMember | $ 322,538 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_AwardTypeAxis = meli_NonAdjustableAwardMember | $ 242,179 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_AwardTypeAxis = meli_NonAdjustableAwardMember

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- Definition The compensation expense recognized during the period pertaining to the deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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