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Income Taxes - Difference Between Provision for Domestic and Foreign Income Taxes and Amount Calculated by Statutory Tax Rate to Net Income Before Income Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Provision computed at statutory rate $ (40,498)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ (21,082)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 43,010us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Change in statutory tax rate 0us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate 0us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate 0us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate
Difference in foreign tax rates 10,130us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential 5,375us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (12,544)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Permanent differences      
Derivative assets adjustment (1,526)mx_IncomeTaxReconciliationDerivativeAssetsNettingAdjustment 1,469mx_IncomeTaxReconciliationDerivativeAssetsNettingAdjustment 3,364mx_IncomeTaxReconciliationDerivativeAssetsNettingAdjustment
TPECs, hybrid and other interest (6,813)mx_IncomeTaxReconciliationHybridAndOtherInterestIncome (3,151)mx_IncomeTaxReconciliationHybridAndOtherInterestIncome (5,920)mx_IncomeTaxReconciliationHybridAndOtherInterestIncome
Permanent impairment     (935)mx_IncomeTaxReconciliationPermanentImpairmentAdjustmentAmount
Thin capitalization     97mx_IncomeTaxReconciliationThinCapitalization
Deemed dividend     7,609mx_IncomeTaxReconciliationDeemedDividend
Permanent foreign currency gain (loss) (901)mx_IncomeTaxReconciliationPermanentForeignCurrencyGainLossAmount 3,351mx_IncomeTaxReconciliationPermanentForeignCurrencyGainLossAmount (465)mx_IncomeTaxReconciliationPermanentForeignCurrencyGainLossAmount
Customs penalty     742mx_EffectiveIncomeTaxRateReconciliationCustomsPenaltyAdjustmentAmount
Non-deductible settlement 6,318mx_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseSettlement    
Other permanent differences (1,097)mx_EffectiveIncomeTaxRateReconciliationOtherPermanentAdjustmentsAmount (881)mx_EffectiveIncomeTaxRateReconciliationOtherPermanentAdjustmentsAmount 1,556mx_EffectiveIncomeTaxRateReconciliationOtherPermanentAdjustmentsAmount
Withholding tax 3,506mx_IncomeTaxReconciliationWithholdingTaxes 3,918mx_IncomeTaxReconciliationWithholdingTaxes 4,242mx_IncomeTaxReconciliationWithholdingTaxes
Foreign exchange rate adjustment 4,687mx_IncomeTaxReconciliationForeignCurrencyAdjustments (7,455)mx_IncomeTaxReconciliationForeignCurrencyAdjustments (4,127)mx_IncomeTaxReconciliationForeignCurrencyAdjustments
Change in valuation allowance 29,484mx_IncomeTaxRateReconciliationChangeInValuationAllowance 24,062mx_IncomeTaxRateReconciliationChangeInValuationAllowance (21,184)mx_IncomeTaxRateReconciliationChangeInValuationAllowance
Tax Credit (1,811)us-gaap_IncomeTaxReconciliationTaxCredits (1,818)us-gaap_IncomeTaxReconciliationTaxCredits (2,796)us-gaap_IncomeTaxReconciliationTaxCredits
Uncertain tax positions liability (56)mx_LiabilityForIncomeTaxesAssociatedWithUncertainTaxPositionsNet (80)mx_LiabilityForIncomeTaxesAssociatedWithUncertainTaxPositionsNet 189mx_LiabilityForIncomeTaxesAssociatedWithUncertainTaxPositionsNet
Others 100us-gaap_IncomeTaxReconciliationOtherAdjustments 262us-gaap_IncomeTaxReconciliationOtherAdjustments 9us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax expenses $ 1,523us-gaap_IncomeTaxExpenseBenefit $ 3,970us-gaap_IncomeTaxExpenseBenefit $ 12,847us-gaap_IncomeTaxExpenseBenefit