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Business Combinations, Goodwill and Intangible Assets (Composition of Goodwill and Intangible Assets) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Indefinite-lived Intangible Assets [Line Items]      
Goodwill $ 65,577us-gaap_Goodwill $ 68,829us-gaap_Goodwill $ 55,101us-gaap_Goodwill
Total intangible assets, net 22,801us-gaap_IntangibleAssetsNetExcludingGoodwill 23,171us-gaap_IntangibleAssetsNetExcludingGoodwill  
Software Development Company In Argentina [Member]      
Indefinite-lived Intangible Assets [Line Items]      
Goodwill 65,577us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_SoftwareDevelopmentCompanyInArgentinaMember
68,829us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_SoftwareDevelopmentCompanyInArgentinaMember
 
Total intangible assets 28,336meli_IntangibleAssetsAndGoodwillGross
/ us-gaap_BusinessAcquisitionAxis
= meli_SoftwareDevelopmentCompanyInArgentinaMember
28,510meli_IntangibleAssetsAndGoodwillGross
/ us-gaap_BusinessAcquisitionAxis
= meli_SoftwareDevelopmentCompanyInArgentinaMember
 
Accumulated amortization (5,535)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_BusinessAcquisitionAxis
= meli_SoftwareDevelopmentCompanyInArgentinaMember
(5,339)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_BusinessAcquisitionAxis
= meli_SoftwareDevelopmentCompanyInArgentinaMember
 
Total intangible assets, net 22,801us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_SoftwareDevelopmentCompanyInArgentinaMember
23,171us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_SoftwareDevelopmentCompanyInArgentinaMember
 
Software Development Company In Argentina [Member] | Licenses and Others [Member]      
Indefinite-lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 5,862us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_BusinessAcquisitionAxis
= meli_SoftwareDevelopmentCompanyInArgentinaMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember
5,111us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_BusinessAcquisitionAxis
= meli_SoftwareDevelopmentCompanyInArgentinaMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember
 
Software Development Company In Argentina [Member] | Non-Compete / Solicitation Agreement [Member]      
Indefinite-lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 1,662us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_BusinessAcquisitionAxis
= meli_SoftwareDevelopmentCompanyInArgentinaMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
1,829us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_BusinessAcquisitionAxis
= meli_SoftwareDevelopmentCompanyInArgentinaMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
 
Software Development Company In Argentina [Member] | Customer Lists [Member]      
Indefinite-lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 10,826us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_BusinessAcquisitionAxis
= meli_SoftwareDevelopmentCompanyInArgentinaMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
11,294us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_BusinessAcquisitionAxis
= meli_SoftwareDevelopmentCompanyInArgentinaMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
 
Trademarks [Member] | Software Development Company In Argentina [Member]      
Indefinite-lived Intangible Assets [Line Items]      
Trademarks $ 9,986us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_SoftwareDevelopmentCompanyInArgentinaMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
$ 10,276us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_BusinessAcquisitionAxis
= meli_SoftwareDevelopmentCompanyInArgentinaMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember