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Long Term Retention Plan - Long Term Retention Plans Accrued Compensation Expense (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Long term retention plan | $ 11,851,615 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount | $ 11,645,077 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount | $ 4,453,858 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
Long Term Retention Plan 2008 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Long term retention plan |  |  | 20,595 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount / us-gaap_PlanNameAxis = meli_LongTermRetentionPlanTwoZeroZeroEightMember
Long Term Retention Plan 2009 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Long term retention plan | 664,619 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount / us-gaap_PlanNameAxis = meli_LongTermRetentionPlanTwoZeroZeroNineMember | 1,562,957 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount / us-gaap_PlanNameAxis = meli_LongTermRetentionPlanTwoZeroZeroNineMember | 587,106 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount / us-gaap_PlanNameAxis = meli_LongTermRetentionPlanTwoZeroZeroNineMember
Long Term Retention Plan 2010 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Long term retention plan | 930,244 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount / us-gaap_PlanNameAxis = meli_LongTermRetentionPlanTwoZeroOneZeroMember | 1,611,521 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount / us-gaap_PlanNameAxis = meli_LongTermRetentionPlanTwoZeroOneZeroMember | 1,006,740 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount / us-gaap_PlanNameAxis = meli_LongTermRetentionPlanTwoZeroOneZeroMember
Long Term Retention Plan 2011 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Long term retention plan | 1,107,795 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount / us-gaap_PlanNameAxis = meli_LongTermRetentionPlanTwoZeroOneOneMember | 1,698,285 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount / us-gaap_PlanNameAxis = meli_LongTermRetentionPlanTwoZeroOneOneMember | 1,236,275 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount / us-gaap_PlanNameAxis = meli_LongTermRetentionPlanTwoZeroOneOneMember
Long Term Retention Plan 2012 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Long term retention plan | 1,385,407 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount / us-gaap_PlanNameAxis = meli_LongTermRetentionPlanTwoZeroOneTwoMember | 2,013,011 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount / us-gaap_PlanNameAxis = meli_LongTermRetentionPlanTwoZeroOneTwoMember | 1,603,142 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount / us-gaap_PlanNameAxis = meli_LongTermRetentionPlanTwoZeroOneTwoMember
Long Term Retention Plan 2013 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Long term retention plan | 3,935,215 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount / us-gaap_PlanNameAxis = meli_LongTermRetentionPlanTwoZeroOneThreeMember | 4,759,303 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount / us-gaap_PlanNameAxis = meli_LongTermRetentionPlanTwoZeroOneThreeMember |
Long Term Retention Plan 2014 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Long term retention plan | $ 3,828,335 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount / us-gaap_PlanNameAxis = meli_LongTermRetentionPlanTwoZeroOneFourMember |  |

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- Definition Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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