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Property, Plant and Equipment (Narrative) (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Property, Plant and Equipment [Line Items]      
Total depreciation expense $ 124,100,000us-gaap_Depreciation $ 108,000,000us-gaap_Depreciation  
Property, Plant and Equipment, Gross 5,423,611,000us-gaap_PropertyPlantAndEquipmentGross   5,369,418,000us-gaap_PropertyPlantAndEquipmentGross
Land [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 207,985,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
  207,985,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
Construction in Progress [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 64,324,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
  39,261,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
K5 Factory [Member] | Land [Member] | KOREA, REPUBLIC OF      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 104,100,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= amkr_K5FacilityMember
/ us-gaap_StatementGeographicalAxis
= country_KR
  104,100,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= amkr_K5FacilityMember
/ us-gaap_StatementGeographicalAxis
= country_KR
K5 Factory [Member] | Construction in Progress [Member] | KOREA, REPUBLIC OF      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 49,900,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= amkr_K5FacilityMember
/ us-gaap_StatementGeographicalAxis
= country_KR
  29,800,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= amkr_K5FacilityMember
/ us-gaap_StatementGeographicalAxis
= country_KR
Accumulated Capitalized Interest Costs $ 10,800,000us-gaap_AccumulatedCapitalizedInterestCosts
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= amkr_K5FacilityMember
/ us-gaap_StatementGeographicalAxis
= country_KR
  $ 8,600,000us-gaap_AccumulatedCapitalizedInterestCosts
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= amkr_K5FacilityMember
/ us-gaap_StatementGeographicalAxis
= country_KR