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Intangible Assets - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 0 Months Ended 3 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Mar. 02, 2012
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]          
Aggregate amortization expenses for intangible assets $ 6,792us-gaap_AmortizationOfIntangibleAssets $ 9,042us-gaap_AmortizationOfIntangibleAssets $ 9,412us-gaap_AmortizationOfIntangibleAssets    
Estimated aggregate amortization expense of intangible assets in 2014 1,488us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths       1,488us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
Estimated aggregate amortization expense of intangible assets in 2015 305us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo       305us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
Estimated aggregate amortization expense of intangible assets in 2016 305us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree       305us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
Estimated aggregate amortization expense of intangible assets in 2017 305us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour       305us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
Estimated aggregate amortization expense of intangible assets in 2018 305us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive       305us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Fabrication facilities [Member]          
Finite-Lived Intangible Assets [Line Items]          
Impairment charges 617us-gaap_AssetImpairmentCharges
/ us-gaap_RestructuringCostAndReserveAxis
= mx_FabricationFacilityMember
       
Dawin Electronics [Member]          
Finite-Lived Intangible Assets [Line Items]          
Date of acquisition Mar. 02, 2012        
Total consideration       9,291us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= mx_DawinElectronicsMember
 
Goodwill recognized       3,163us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= mx_DawinElectronicsMember
 
Impairment of goodwill 3,389us-gaap_GoodwillImpairmentLoss
/ us-gaap_BusinessAcquisitionAxis
= mx_DawinElectronicsMember
      3,389us-gaap_GoodwillImpairmentLoss
/ us-gaap_BusinessAcquisitionAxis
= mx_DawinElectronicsMember
Impairment charges         5,253us-gaap_AssetImpairmentCharges
/ us-gaap_BusinessAcquisitionAxis
= mx_DawinElectronicsMember
Technology [Member] | Dawin Electronics [Member]          
Finite-Lived Intangible Assets [Line Items]          
Impairment charges 1,864us-gaap_AssetImpairmentCharges
/ us-gaap_BusinessAcquisitionAxis
= mx_DawinElectronicsMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentedTechnologyMember
      1,864us-gaap_AssetImpairmentCharges
/ us-gaap_BusinessAcquisitionAxis
= mx_DawinElectronicsMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentedTechnologyMember
IPR&D [Member]          
Finite-Lived Intangible Assets [Line Items]          
IPR&D reclassified into technology     $ 1,572mx_IndefiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_InProcessResearchAndDevelopmentMember