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Debt (Long Term Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Long-term Debt Including Related Party, Gross $ 1,525,000amkr_LongtermDebtIncludingRelatedPartyGross $ 1,646,350amkr_LongtermDebtIncludingRelatedPartyGross
Debt Instrument, Unamortized Premium 5,824us-gaap_DebtInstrumentUnamortizedPremium 6,390us-gaap_DebtInstrumentUnamortizedPremium
Less: Short-term borrowings and current portion of long-term debt (5,000)us-gaap_DebtCurrent (61,350)us-gaap_DebtCurrent
Long-term debt (including related party) 1,525,824amkr_NonCurrentLongTermDebtIncludingRelatedParty 1,591,390amkr_NonCurrentLongTermDebtIncludingRelatedParty
$200 million revolving credit facility, LIBOR plus 1.25%-1.75%, due December 2019 (1) | Revolving Credit Facility [Member] | Line of Credit [Member]    
Debt Instrument [Line Items]    
Long-term Debt Including Related Party, Gross 0amkr_LongtermDebtIncludingRelatedPartyGross
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= amkr_SeniorSecuredRevolvingCreditFacilitydueDecember2019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		 0amkr_LongtermDebtIncludingRelatedPartyGross
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= amkr_SeniorSecuredRevolvingCreditFacilitydueDecember2019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
7.375% Senior notes, due May 2018 | Senior Notes [Member]    
Debt Instrument [Line Items]    
Long-term Debt Including Related Party, Gross 345,000amkr_LongtermDebtIncludingRelatedPartyGross
/ us-gaap_DebtInstrumentAxis
= amkr_SeniorNotesDueMay2018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 345,000amkr_LongtermDebtIncludingRelatedPartyGross
/ us-gaap_DebtInstrumentAxis
= amkr_SeniorNotesDueMay2018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
6.625% Senior notes, due June 2021, $75 million related party | Senior Notes [Member]    
Debt Instrument [Line Items]    
Long-term Debt Including Related Party, Gross 400,000amkr_LongtermDebtIncludingRelatedPartyGross
/ us-gaap_DebtInstrumentAxis
= amkr_SeniorNotesDue2021Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 400,000amkr_LongtermDebtIncludingRelatedPartyGross
/ us-gaap_DebtInstrumentAxis
= amkr_SeniorNotesDue2021Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
6.375% Senior notes, due October 2022 | Senior Notes [Member]    
Debt Instrument [Line Items]    
Long-term Debt Including Related Party, Gross 525,000amkr_LongtermDebtIncludingRelatedPartyGross
/ us-gaap_DebtInstrumentAxis
= amkr_SeniorNotesDueOctober2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 525,000amkr_LongtermDebtIncludingRelatedPartyGross
/ us-gaap_DebtInstrumentAxis
= amkr_SeniorNotesDueOctober2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
6.0% Convertible senior subordinated notes, due April 2014 (2) | Convertible Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt Including Related Party, Gross 0amkr_LongtermDebtIncludingRelatedPartyGross
/ us-gaap_DebtInstrumentAxis
= amkr_ConvertibleSeniorSubordinatedNotesDueApril2014Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleSubordinatedDebtMember		 56,350amkr_LongtermDebtIncludingRelatedPartyGross
/ us-gaap_DebtInstrumentAxis
= amkr_ConvertibleSeniorSubordinatedNotesDueApril2014Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleSubordinatedDebtMember
KOREA, REPUBLIC OF | $41 million revolving credit facility, foreign currency funding-linked base rate plus 2.00%, due June 2016 (3) | Revolving Credit Facility [Member] | Line of Credit [Member]    
Debt Instrument [Line Items]    
Long-term Debt Including Related Party, Gross 0amkr_LongtermDebtIncludingRelatedPartyGross
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= amkr_RevolvingcreditfacilitydueJune2016Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_StatementGeographicalAxis
= country_KR		 0amkr_LongtermDebtIncludingRelatedPartyGross
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= amkr_RevolvingcreditfacilitydueJune2016Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_StatementGeographicalAxis
= country_KR
KOREA, REPUBLIC OF | Term loan, LIBOR plus 3.70%, due June 2016 (4) | Subsidiary Term Loans [Member]    
Debt Instrument [Line Items]    
Long-term Debt Including Related Party, Gross 70,000amkr_LongtermDebtIncludingRelatedPartyGross
/ us-gaap_DebtInstrumentAxis
= amkr_TermLoanDueJune2016Member
/ us-gaap_LongtermDebtTypeAxis
= amkr_SubsidiaryTermLoansMember
/ us-gaap_StatementGeographicalAxis
= country_KR		 70,000amkr_LongtermDebtIncludingRelatedPartyGross
/ us-gaap_DebtInstrumentAxis
= amkr_TermLoanDueJune2016Member
/ us-gaap_LongtermDebtTypeAxis
= amkr_SubsidiaryTermLoansMember
/ us-gaap_StatementGeographicalAxis
= country_KR
KOREA, REPUBLIC OF | Term loan, foreign currency funding-linked base rate plus 2.00%, due March 2017 (5) | Subsidiary Term Loans [Member]    
Debt Instrument [Line Items]    
Long-term Debt Including Related Party, Gross 80,000amkr_LongtermDebtIncludingRelatedPartyGross
/ us-gaap_DebtInstrumentAxis
= amkr_TermLoanDueMarch2017Member
/ us-gaap_LongtermDebtTypeAxis
= amkr_SubsidiaryTermLoansMember
/ us-gaap_StatementGeographicalAxis
= country_KR		 0amkr_LongtermDebtIncludingRelatedPartyGross
/ us-gaap_DebtInstrumentAxis
= amkr_TermLoanDueMarch2017Member
/ us-gaap_LongtermDebtTypeAxis
= amkr_SubsidiaryTermLoansMember
/ us-gaap_StatementGeographicalAxis
= country_KR
KOREA, REPUBLIC OF | Term loan, LIBOR plus 3.70%, due July 2017 (6) | Subsidiary Term Loans [Member]    
Debt Instrument [Line Items]    
Long-term Debt Including Related Party, Gross 30,000amkr_LongtermDebtIncludingRelatedPartyGross
/ us-gaap_DebtInstrumentAxis
= amkr_TermLoanDueJuly2017Member
/ us-gaap_LongtermDebtTypeAxis
= amkr_SubsidiaryTermLoansMember
/ us-gaap_StatementGeographicalAxis
= country_KR		 90,000amkr_LongtermDebtIncludingRelatedPartyGross
/ us-gaap_DebtInstrumentAxis
= amkr_TermLoanDueJuly2017Member
/ us-gaap_LongtermDebtTypeAxis
= amkr_SubsidiaryTermLoansMember
/ us-gaap_StatementGeographicalAxis
= country_KR
KOREA, REPUBLIC OF | Term loan, foreign currency funding-linked base rate plus 1.75%, due September 2017 (7) | Subsidiary Term Loans [Member]    
Debt Instrument [Line Items]    
Long-term Debt Including Related Party, Gross 5,000amkr_LongtermDebtIncludingRelatedPartyGross
/ us-gaap_DebtInstrumentAxis
= amkr_TermLoanDueSeptember2017Member
/ us-gaap_LongtermDebtTypeAxis
= amkr_SubsidiaryTermLoansMember
/ us-gaap_StatementGeographicalAxis
= country_KR		 10,000amkr_LongtermDebtIncludingRelatedPartyGross
/ us-gaap_DebtInstrumentAxis
= amkr_TermLoanDueSeptember2017Member
/ us-gaap_LongtermDebtTypeAxis
= amkr_SubsidiaryTermLoansMember
/ us-gaap_StatementGeographicalAxis
= country_KR
KOREA, REPUBLIC OF | Term loan, LIBOR plus 3.70%, due December 2019 | Subsidiary Term Loans [Member]    
Debt Instrument [Line Items]    
Long-term Debt Including Related Party, Gross 70,000amkr_LongtermDebtIncludingRelatedPartyGross
/ us-gaap_DebtInstrumentAxis
= amkr_TermLoanDueDecember2019Member
/ us-gaap_LongtermDebtTypeAxis
= amkr_SubsidiaryTermLoansMember
/ us-gaap_StatementGeographicalAxis
= country_KR		 70,000amkr_LongtermDebtIncludingRelatedPartyGross
/ us-gaap_DebtInstrumentAxis
= amkr_TermLoanDueDecember2019Member
/ us-gaap_LongtermDebtTypeAxis
= amkr_SubsidiaryTermLoansMember
/ us-gaap_StatementGeographicalAxis
= country_KR
KOREA, REPUBLIC OF | Term loan, foreign currency funding-linked base rate plus 2.30%, due March 2015 | Subsidiary Term Loans [Member]    
Debt Instrument [Line Items]    
Long-term Debt Including Related Party, Gross 0amkr_LongtermDebtIncludingRelatedPartyGross
/ us-gaap_DebtInstrumentAxis
= amkr_TermLoanDueMarch2015Member
/ us-gaap_LongtermDebtTypeAxis
= amkr_SubsidiaryTermLoansMember
/ us-gaap_StatementGeographicalAxis
= country_KR		 80,000amkr_LongtermDebtIncludingRelatedPartyGross
/ us-gaap_DebtInstrumentAxis
= amkr_TermLoanDueMarch2015Member
/ us-gaap_LongtermDebtTypeAxis
= amkr_SubsidiaryTermLoansMember
/ us-gaap_StatementGeographicalAxis
= country_KR
TAIWAN, PROVINCE OF CHINA | Revolving credit facility, TAIFX plus a bank-determined spread, due April 2015 (Taiwan) (8) | Revolving Credit Facility [Member] | Line of Credit [Member]    
Debt Instrument [Line Items]    
Long-term Debt Including Related Party, Gross $ 0amkr_LongtermDebtIncludingRelatedPartyGross
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= amkr_RevolvingCreditFacilityDueApril2015Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_StatementGeographicalAxis
= country_TW		 $ 0amkr_LongtermDebtIncludingRelatedPartyGross
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= amkr_RevolvingCreditFacilityDueApril2015Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_StatementGeographicalAxis
= country_TW