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Segments - Allocation of Property Plant and Equipment, Net Based on Geography (Detail) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]    
Other countries long-lived tangible assets $ 91,544,836us-gaap_PropertyPlantAndEquipmentNet $ 131,371,909us-gaap_PropertyPlantAndEquipmentNet
United States [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Other countries long-lived tangible assets 13,226,091us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_US
9,131,777us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_US
Argentina [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Other countries long-lived tangible assets 28,005,493us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_AR
29,119,057us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_AR
Brazil [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Other countries long-lived tangible assets 8,237,459us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_BR
5,559,702us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_BR
Mexico [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Other countries long-lived tangible assets 2,801,115us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_MX
711,200us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_MX
Venezuela [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Other countries long-lived tangible assets 36,237,494us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_VE
[1] 83,655,816us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_VE
[1]
Other Countries [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Other countries long-lived tangible assets 3,037,184us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= meli_OtherCountriesMember
3,194,357us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= meli_OtherCountriesMember
Other Non Us Countries [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Other countries long-lived tangible assets $ 78,318,745us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= meli_OtherNonUsCountriesMember
$ 122,240,132us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= meli_OtherNonUsCountriesMember
[1] After the impairment of Venezuelan long-lived assets (See Note 2 "Impairment of Long-lived assets").