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Fair Value Measurements - Schedule of Fair Value of Long-term Borrowings (Parenthetical) (Detail) (Senior notes [Member], 6.625% senior notes due 2021 [Member])
 0 Months Ended 12 Months Ended
Jul. 18, 2013
Dec. 31, 2014
Dec. 31, 2013
Jul. 18, 2013
Senior notes [Member] | 6.625% senior notes due 2021 [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Interest rate 6.625%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= mx_SixPointSixTwoFiveZeroPercentageSeniorSecuredNotesDueTwoThousandTwentyOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 6.625%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= mx_SixPointSixTwoFiveZeroPercentageSeniorSecuredNotesDueTwoThousandTwentyOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 6.625%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= mx_SixPointSixTwoFiveZeroPercentageSeniorSecuredNotesDueTwoThousandTwentyOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 6.625%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= mx_SixPointSixTwoFiveZeroPercentageSeniorSecuredNotesDueTwoThousandTwentyOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Due date Jul. 15, 2021 Jul. 15, 2021 Jul. 15, 2021