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Accounts Receivable, Trade Narrative (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Total Factored [Member]    
Factoring of Accounts Receivable [Line Items]    
Accounts Receivable Sold without Recourse $ 340.0amkr_AccountsReceivableSoldwithoutRecourse
/ amkr_FactoringofAccountsReceivableAxis
= amkr_TotalFactoredMember		 $ 130.2amkr_AccountsReceivableSoldwithoutRecourse
/ amkr_FactoringofAccountsReceivableAxis
= amkr_TotalFactoredMember
Factoring Fees [Member]    
Factoring of Accounts Receivable [Line Items]    
Accounts Receivable Sold without Recourse $ 1.5amkr_AccountsReceivableSoldwithoutRecourse
/ amkr_FactoringofAccountsReceivableAxis
= amkr_FactoringFeesMember		 $ 0.6amkr_AccountsReceivableSoldwithoutRecourse
/ amkr_FactoringofAccountsReceivableAxis
= amkr_FactoringFeesMember