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Business Acquisitions (Details)
12 Months Ended 1 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Mar. 31, 2014
Toshiba Electronics Malaysia [Member]
USD ($)
Jul. 31, 2013
Toshiba Electronics Malaysia [Member]
USD ($)
Dec. 31, 2014
Toshiba Electronics Malaysia [Member]
USD ($)
Dec. 31, 2014
Toshiba Electronics Malaysia [Member]
JPY (¥)
Business Acquisition [Line Items]              
Business Acquisition, Percentage of Voting Interests Acquired         100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= amkr_ToshibaElectronicsMalaysiaMember
   
Business Combination, Consideration Transferred         $ 61,200,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= amkr_ToshibaElectronicsMalaysiaMember
   
Business Acquisition, Cost of Acquired Entity, Cash Paid         42,400,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= amkr_ToshibaElectronicsMalaysiaMember
   
Final Installment Payment for Previous Acquisition 18,763,000amkr_FinalInstallmentPaymentforPreviousAcquisition 0amkr_FinalInstallmentPaymentforPreviousAcquisition 0amkr_FinalInstallmentPaymentforPreviousAcquisition 18,800,000amkr_FinalInstallmentPaymentforPreviousAcquisition
/ us-gaap_BusinessAcquisitionAxis
= amkr_ToshibaElectronicsMalaysiaMember
     
Cap on Future Royalty Payments           $ 13,000,000amkr_CaponFutureRoyaltyPayments
/ us-gaap_BusinessAcquisitionAxis
= amkr_ToshibaElectronicsMalaysiaMember
¥ 1,500,000,000amkr_CaponFutureRoyaltyPayments
/ us-gaap_BusinessAcquisitionAxis
= amkr_ToshibaElectronicsMalaysiaMember