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Income Taxes - Summary of Composition of Net Deferred Income Tax Assets (Liabilities) (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Deferred tax assets        
Accounts Receivables $ 1,076mx_DeferredTaxAssetsAccountsReceivable $ 28,628mx_DeferredTaxAssetsAccountsReceivable $ 8,799mx_DeferredTaxAssetsAccountsReceivable  
Inventories 11,015us-gaap_DeferredTaxAssetsInventory 5,866us-gaap_DeferredTaxAssetsInventory 3,501us-gaap_DeferredTaxAssetsInventory  
Accrued expenses 9,030us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 8,758us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 2,812us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities  
Product warranties 719us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves 292us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves 306us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves  
Other reserves 457us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther 684us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther 1,072us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther  
Royalty income 147mx_DeferredTaxAssetsRoyaltyIncome 1,364mx_DeferredTaxAssetsRoyaltyIncome 3,118mx_DeferredTaxAssetsRoyaltyIncome  
Property, plant and equipment 15,914us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 13,667us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 12,945us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment  
Intangible assets 780us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets 922us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets    
Accumulated severance benefits 30,413us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsSeverancePayments 27,769us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsSeverancePayments 23,465us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsSeverancePayments  
Foreign currency translation loss 17,496us-gaap_DeferredTaxAssetsUnrealizedCurrencyLosses 12,220us-gaap_DeferredTaxAssetsUnrealizedCurrencyLosses 13,533us-gaap_DeferredTaxAssetsUnrealizedCurrencyLosses  
NOL carry-forwards 80,979us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 53,714us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 72,533us-gaap_DeferredTaxAssetsOperatingLossCarryforwards  
Tax credit 25,161us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 26,041us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 26,786us-gaap_DeferredTaxAssetsTaxCreditCarryforwards  
Other long-term payable 1,034mx_DeferredTaxAssetsLongTermDebt 608mx_DeferredTaxAssetsLongTermDebt 168mx_DeferredTaxAssetsLongTermDebt  
Others 1,990us-gaap_DeferredTaxAssetsOther 2,887us-gaap_DeferredTaxAssetsOther 1,438us-gaap_DeferredTaxAssetsOther  
Total deferred tax assets 196,211us-gaap_DeferredTaxAssetsGross 183,420us-gaap_DeferredTaxAssetsGross 170,476us-gaap_DeferredTaxAssetsGross  
Less: valuation allowance (194,739)us-gaap_DeferredTaxAssetsValuationAllowance (178,729)us-gaap_DeferredTaxAssetsValuationAllowance (162,968)us-gaap_DeferredTaxAssetsValuationAllowance (200,056)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred tax assets, net 1,472us-gaap_DeferredTaxAssetsNet 4,691us-gaap_DeferredTaxAssetsNet 7,508us-gaap_DeferredTaxAssetsNet  
Deferred tax liabilities        
Derivative assets   1,189us-gaap_DeferredTaxLiabilitiesDerivatives 124us-gaap_DeferredTaxLiabilitiesDerivatives  
Intangible assets     1,712us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets  
Foreign currency translation gain 748us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains 19us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains 1,003us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains  
Others 147us-gaap_DeferredTaxLiabilitiesOther 1,239us-gaap_DeferredTaxLiabilitiesOther 295us-gaap_DeferredTaxLiabilitiesOther  
Total deferred tax liabilities 895us-gaap_DeferredIncomeTaxLiabilities 2,447us-gaap_DeferredIncomeTaxLiabilities 3,134us-gaap_DeferredIncomeTaxLiabilities  
Net deferred tax assets 577us-gaap_DeferredTaxAssetsLiabilitiesNet 2,244us-gaap_DeferredTaxAssetsLiabilitiesNet 4,374us-gaap_DeferredTaxAssetsLiabilitiesNet  
Reported as        
Current deferred income tax assets 237us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 1,348us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 1,788us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent  
Non-current deferred income tax assets 415us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent 896us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent 2,586us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent  
Current deferred income tax liabilities (72)us-gaap_DeferredTaxLiabilitiesCurrent      
Non-current deferred income tax liabilities (3)us-gaap_DeferredTaxLiabilitiesNoncurrent      
Net deferred tax assets $ 577us-gaap_DeferredTaxAssetsLiabilitiesNet $ 2,244us-gaap_DeferredTaxAssetsLiabilitiesNet $ 4,374us-gaap_DeferredTaxAssetsLiabilitiesNet