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Income Taxes (Unrecognized tax benefits - rollforward and discussion) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]        
Balance, beginning of period $ 27,128,000us-gaap_UnrecognizedTaxBenefits $ 8,218,000us-gaap_UnrecognizedTaxBenefits $ 7,930,000us-gaap_UnrecognizedTaxBenefits  
Additions based on tax positions related to the current year 6,032,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 17,752,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 5,551,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions  
Additions for tax positions of prior years 1,240,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 2,723,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 54,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions  
Reductions for tax positions of prior years (15,433,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions (108,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions (4,091,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions  
Reductions related to settlements with tax authorities 6,297,000us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities 1,353,000us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities 1,226,000us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities  
Reductions from lapse of statutes of limitations 0us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations (104,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations 0us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations  
Balance, end of period 12,670,000us-gaap_UnrecognizedTaxBenefits 27,128,000us-gaap_UnrecognizedTaxBenefits 8,218,000us-gaap_UnrecognizedTaxBenefits  
Income tax contingency [Abstract]        
Unrecognized tax benefits, period increase (decrease) 14,500,000us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease      
Liability for uncertain tax positions 10,500,000us-gaap_LiabilityForUncertainTaxPositionsNoncurrent      
Tax Deductions [Member]        
Income tax contingency [Abstract]        
Unrecognized tax benefits, period increase (decrease) 15,400,000us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease
/ amkr_UnrecognizedTaxBenefitByTypeOfChangeAxisAxis
= amkr_TaxDeductionsMember
     
Settlement with Taxing Authority [Member]        
Income tax contingency [Abstract]        
Unrecognized tax benefits, period increase (decrease) 5,100,000us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease
/ amkr_UnrecognizedTaxBenefitByTypeOfChangeAxisAxis
= us-gaap_SettlementWithTaxingAuthorityMember
     
Contested Prior Year Deductions In Foreign Jurisdictions [Member]        
Income tax contingency [Abstract]        
Unrecognized tax benefits, period increase (decrease) 6,000,000us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease
/ amkr_UnrecognizedTaxBenefitByTypeOfChangeAxisAxis
= amkr_ContestedPriorYearDeductionsInForeignJurisdictionsMember
     
Scenario, Forecast [Member]        
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]        
Reductions from lapse of statutes of limitations       $ (600,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember