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Factoring of Accounts Receivable (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Total Factored [Member]    
Accounts Receivable Sold without Recourse [Line Items]    
Accounts Receivable Sold without Recourse $ 81.3amkr_AccountsReceivableSoldwithoutRecourse
/ amkr_FactoringofAccountsReceivableAxis
= amkr_TotalFactoredMember		 $ 69.0amkr_AccountsReceivableSoldwithoutRecourse
/ amkr_FactoringofAccountsReceivableAxis
= amkr_TotalFactoredMember
Factoring Fees [Member]    
Accounts Receivable Sold without Recourse [Line Items]    
Accounts Receivable Sold without Recourse $ 0.4amkr_AccountsReceivableSoldwithoutRecourse
/ amkr_FactoringofAccountsReceivableAxis
= amkr_FactoringFeesMember		 $ 0.3amkr_AccountsReceivableSoldwithoutRecourse
/ amkr_FactoringofAccountsReceivableAxis
= amkr_FactoringFeesMember