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Consolidated Statements of Cash Flows (Parenthetical) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Non cash investing and financing activities:    
Common stock issuance for conversion and exchange in 2014 and 2013, respectively, of 6.0% convertible senior subordinated notes due April 2014, $150 million related party in 2013 $ 56,350us-gaap_DebtConversionConvertedInstrumentAmount1 $ 193,650us-gaap_DebtConversionConvertedInstrumentAmount1
6.0% Convertible senior subordinated notes, due April 2014 (2)    
Non cash investing and financing activities:    
Interest rate of convertible subordinated notes 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= amkr_ConvertibleSeniorSubordinatedNotesDueApril2014Member		 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= amkr_ConvertibleSeniorSubordinatedNotesDueApril2014Member
Related Party [Member] | 6.0% Convertible senior subordinated notes, due April 2014 (2)    
Non cash investing and financing activities:    
Common stock issuance for conversion and exchange in 2014 and 2013, respectively, of 6.0% convertible senior subordinated notes due April 2014, $150 million related party in 2013 $ 0us-gaap_DebtConversionConvertedInstrumentAmount1
/ us-gaap_LongtermDebtTypeAxis
= amkr_ConvertibleSeniorSubordinatedNotesDueApril2014Member
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= amkr_LongTermDebtDuetoRelatedPartyMember		 $ 0us-gaap_DebtConversionConvertedInstrumentAmount1
/ us-gaap_LongtermDebtTypeAxis
= amkr_ConvertibleSeniorSubordinatedNotesDueApril2014Member
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= amkr_LongTermDebtDuetoRelatedPartyMember