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Earnings Per Share Antidilutive (Details) (Stock Options And Restricted Shares [Member])
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Stock Options And Restricted Shares [Member]
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Stock options and restricted share awards 1,400us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= amkr_StockOptionsAndRestrictedSharesMember
4,265us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= amkr_StockOptionsAndRestrictedSharesMember