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Investments (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Apr. 30, 2013
Mar. 31, 2013
Schedule of Equity Method Investments [Line Items]        
Equity Method Investments $ 117,733us-gaap_EquityMethodInvestments $ 105,214us-gaap_EquityMethodInvestments    
J Devices [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity Method Investments $ 117,733us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= amkr_JDevicesMember		 $ 105,214us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= amkr_JDevicesMember		    
Equity Method Investment, Ownership Percentage 60.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= amkr_JDevicesMember		 60.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= amkr_JDevicesMember		 60.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= amkr_JDevicesMember		 30.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= amkr_JDevicesMember