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Earnings Per Share (Antidilutive) (Details) (Stock Options And Restricted Shares [Member])
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Stock Options And Restricted Shares [Member]
     
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Total potentially dilutive shares 1,303us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= amkr_StockOptionsAndRestrictedSharesMember
4,890us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= amkr_StockOptionsAndRestrictedSharesMember
4,416us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= amkr_StockOptionsAndRestrictedSharesMember