Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Net sales	$ 742,875us-gaap_SalesRevenueNet	$ 696,044us-gaap_SalesRevenueNet
Cost of sales	607,928us-gaap_CostOfGoodsAndServicesSold	567,224us-gaap_CostOfGoodsAndServicesSold
Gross profit	134,947us-gaap_GrossProfit	128,820us-gaap_GrossProfit
Selling, general and administrative	62,942	62,424
Research and development	18,026us-gaap_ResearchAndDevelopmentExpense	21,045us-gaap_ResearchAndDevelopmentExpense
Total operating expenses	80,968us-gaap_OperatingExpenses	83,469us-gaap_OperatingExpenses
Operating income	53,979us-gaap_OperatingIncomeLoss	45,351us-gaap_OperatingIncomeLoss
Interest expense	23,777us-gaap_InterestExpense	23,722us-gaap_InterestExpense
Interest expense, related party	1,242us-gaap_InterestExpenseRelatedParty	1,242us-gaap_InterestExpenseRelatedParty
Other (income) expense, net	(498)us-gaap_OtherNonoperatingIncomeExpense	36us-gaap_OtherNonoperatingIncomeExpense
Total other expense, net	24,521us-gaap_NonoperatingIncomeExpense	25,000us-gaap_NonoperatingIncomeExpense
Income before taxes and equity in earnings of unconsolidated affiliate	29,458	20,351
Income tax expense	5,999us-gaap_IncomeTaxExpenseBenefit	4,929us-gaap_IncomeTaxExpenseBenefit
Income before equity in earnings of unconsolidated affiliate	23,459	15,422
Equity in earnings of J-Devices	6,238	5,761
Net income	29,697us-gaap_ProfitLoss	21,183us-gaap_ProfitLoss
Net income attributable to noncontrolling interests	(916)	(550)
Net income attributable to Amkor	$ 28,781us-gaap_NetIncomeLoss	$ 20,633us-gaap_NetIncomeLoss
Net income attributable to Amkor per common share:
Basic (in dollars per share)	$ 0.12us-gaap_EarningsPerShareBasic	$ 0.09us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 0.12us-gaap_EarningsPerShareDiluted	$ 0.09us-gaap_EarningsPerShareDiluted
Shares used in computing per common share amounts:
Basic (in shares)	236,708	216,757
Diluted (in shares)	237,424	235,497

Net income before the entity's share of its equity method investee's earnings.

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