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GOODWILL AND INTANGIBLE ASSETS: (Details 3) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Estimated future amortization expenses from amortizable intangible assets    
Net carrying value of amortizable intangible assets $ 39,708us-gaap_FiniteLivedIntangibleAssetsNet $ 42,067us-gaap_FiniteLivedIntangibleAssetsNet
Total amortizable intangible assets, excluding IPR&D    
Estimated future amortization expenses from amortizable intangible assets    
Remaining nine months of 2015 5,648us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= mlnx_FiniteLivedIntangibleAssetsExcludingInProcessResearchAndDevelopmentMember
 
2016 7,194us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= mlnx_FiniteLivedIntangibleAssetsExcludingInProcessResearchAndDevelopmentMember
 
2017 7,128us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= mlnx_FiniteLivedIntangibleAssetsExcludingInProcessResearchAndDevelopmentMember
 
2018 4,148us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= mlnx_FiniteLivedIntangibleAssetsExcludingInProcessResearchAndDevelopmentMember
 
2019 779us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= mlnx_FiniteLivedIntangibleAssetsExcludingInProcessResearchAndDevelopmentMember
 
2020 and thereafter 1,047mlnx_FiniteLivedIntangibleAssetsAmortizationExpenseYearFiveAndThereafter
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= mlnx_FiniteLivedIntangibleAssetsExcludingInProcessResearchAndDevelopmentMember
 
Net carrying value of amortizable intangible assets $ 25,944us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= mlnx_FiniteLivedIntangibleAssetsExcludingInProcessResearchAndDevelopmentMember
$ 28,303us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= mlnx_FiniteLivedIntangibleAssetsExcludingInProcessResearchAndDevelopmentMember