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Income Taxes - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax Contingency [Line Items]        
Effective tax rate   10.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations    
Statutory income tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate      
Net deferred tax assets $ 2,244us-gaap_DeferredTaxAssetsLiabilitiesNet $ 4,374us-gaap_DeferredTaxAssetsLiabilitiesNet $ 6,846us-gaap_DeferredTaxAssetsLiabilitiesNet  
Deferred tax assets, valuation allowance amount 178,729us-gaap_DeferredTaxAssetsValuationAllowance 162,968us-gaap_DeferredTaxAssetsValuationAllowance 200,056us-gaap_DeferredTaxAssetsValuationAllowance 207,774us-gaap_DeferredTaxAssetsValuationAllowance
Net operating loss carry-forwards 195,421us-gaap_OperatingLossCarryforwards      
Net operating loss utilized 69,159mx_OperatingLossCarryforwardsUtilizedDuringPeriod 86,938mx_OperatingLossCarryforwardsUtilizedDuringPeriod 32,749mx_OperatingLossCarryforwardsUtilizedDuringPeriod  
Net operating loss expiration date 2019      
Unrecognized tax benefits 3,706mx_UnrecognizedTaxBenefitsRecordedLiability 3,820mx_UnrecognizedTaxBenefitsRecordedLiability 3,472mx_UnrecognizedTaxBenefitsRecordedLiability  
Income tax benefits by reversing liabilities 106mx_RecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations 5mx_RecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations 5mx_RecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations  
Income tax expenses for uncertain tax positions 7mx_IncomeTaxExpenseReservesOnUncertainTaxPositions 55mx_IncomeTaxExpenseReservesOnUncertainTaxPositions 474mx_IncomeTaxExpenseReservesOnUncertainTaxPositions  
Recognized interest and penalties as income tax expense 20us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense 139us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense 78us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense  
Total interest and penalties accrued 530us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 544us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 396us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued  
MagnaChip Semiconductor, Ltd. [Member]        
Income Tax Contingency [Line Items]        
Statutory income tax rate 24.20%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
/ dei_LegalEntityAxis
= mx_MagnachipSemiconductorLtdMember		 24.20%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
/ dei_LegalEntityAxis
= mx_MagnachipSemiconductorLtdMember		 24.20%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
/ dei_LegalEntityAxis
= mx_MagnachipSemiconductorLtdMember		  
Korean [Member]        
Income Tax Contingency [Line Items]        
Tax credit carry-forwards 9,252us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_TaxCreditCarryforwardAxis
= mx_KoreanMember		      
Net operating loss carry-forwards, expiration period 2014 to 2018      
Dutch [Member]        
Income Tax Contingency [Line Items]        
Tax credit carry-forwards $ 16,789us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_TaxCreditCarryforwardAxis
= mx_DutchStatutoryTaxRateMember		      
Net operating loss carry-forwards, expiration period Indefinite period of time