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