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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, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]      
Provision computed at statutory rate $ (21,082)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 43,010us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ (1,115)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Change in statutory tax rate     (11,872)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate
Difference in foreign tax rates 5,375us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (12,544)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential 3,946us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Permanent differences      
Derivative assets adjustment 1,469mx_IncomeTaxReconciliationDerivativeAssetsNettingAdjustment 3,364mx_IncomeTaxReconciliationDerivativeAssetsNettingAdjustment (6,334)mx_IncomeTaxReconciliationDerivativeAssetsNettingAdjustment
TPECs, hybrid and other interest (3,151)mx_IncomeTaxReconciliationHybridAndOtherInterestIncome (5,920)mx_IncomeTaxReconciliationHybridAndOtherInterestIncome (6,513)mx_IncomeTaxReconciliationHybridAndOtherInterestIncome
Permanent impairment   (935)mx_IncomeTaxReconciliationPermanentImpairmentAdjustmentAmount (5,120)mx_IncomeTaxReconciliationPermanentImpairmentAdjustmentAmount
Thin capitalization   97mx_IncomeTaxReconciliationThinCapitalization 3,422mx_IncomeTaxReconciliationThinCapitalization
Deemed dividend   7,609mx_IncomeTaxReconciliationDeemedDividend  
Permanent foreign currency gain (loss) 3,351mx_IncomeTaxReconciliationPermanentForeignCurrencyGainLossAmount (465)mx_IncomeTaxReconciliationPermanentForeignCurrencyGainLossAmount 2,439mx_IncomeTaxReconciliationPermanentForeignCurrencyGainLossAmount
Customs penalty   742mx_EffectiveIncomeTaxRateReconciliationCustomsPenaltyAdjustmentAmount  
Other permanent differences (881)mx_EffectiveIncomeTaxRateReconciliationOtherPermanantAdjustmentsAmount 1,556mx_EffectiveIncomeTaxRateReconciliationOtherPermanantAdjustmentsAmount 674mx_EffectiveIncomeTaxRateReconciliationOtherPermanantAdjustmentsAmount
Withholding tax 3,918mx_IncomeTaxReconciliationWithholdingTaxes 4,242mx_IncomeTaxReconciliationWithholdingTaxes 5,861mx_IncomeTaxReconciliationWithholdingTaxes
Foreign exchange rate adjustment (7,455)us-gaap_IncomeTaxReconciliationTaxSettlementsForeign (4,127)us-gaap_IncomeTaxReconciliationTaxSettlementsForeign 3,867us-gaap_IncomeTaxReconciliationTaxSettlementsForeign
Change in valuation allowance 24,062mx_IncomeTaxRateReconciliationChangeInValuationAllowance (21,184)mx_IncomeTaxRateReconciliationChangeInValuationAllowance 20,124mx_IncomeTaxRateReconciliationChangeInValuationAllowance
Tax Credit (1,818)us-gaap_IncomeTaxReconciliationTaxCredits (2,796)us-gaap_IncomeTaxReconciliationTaxCredits (1,823)us-gaap_IncomeTaxReconciliationTaxCredits
Uncertain tax positions liability (80)mx_LiabilityForIncomeTaxesAssociatedWithUncertainTaxPositionsNet 189mx_LiabilityForIncomeTaxesAssociatedWithUncertainTaxPositionsNet 548mx_LiabilityForIncomeTaxesAssociatedWithUncertainTaxPositionsNet
Others 262us-gaap_IncomeTaxReconciliationOtherAdjustments 9us-gaap_IncomeTaxReconciliationOtherAdjustments 11us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax expenses $ 3,970us-gaap_IncomeTaxExpenseBenefit $ 12,847us-gaap_IncomeTaxExpenseBenefit $ 8,115us-gaap_IncomeTaxExpenseBenefit