Sale of Subsidiary of J-Devices (Details)	3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended				1 Months Ended		3 Months Ended	6 Months Ended
	Jun. 30, 2014 USD ($)	Jun. 30, 2013 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2013 USD ($)	Jun. 30, 2014 J-Devices [Member] USD ($)	Jun. 30, 2014 J-Devices [Member] USD ($)	Dec. 31, 2013 J-Devices [Member]	Apr. 30, 2013 J-Devices [Member]	Mar. 31, 2013 J-Devices [Member]	Jun. 30, 2014 Amkor Iwate Company Ltd [Member] USD ($)	Jun. 30, 2014 Amkor Iwate Company Ltd [Member] JPY (¥)	Jun. 30, 2014 Amkor Iwate Company Ltd [Member] USD ($)	Jun. 30, 2014 Amkor Iwate Company Ltd [Member] USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale of Stock, Percentage of Ownership before Transaction										100.00%	100.00%
Equity Method Investment, Ownership Percentage					60.00%	60.00%	60.00%	60.00%	30.00%
Sale of Stock, Consideration Received on Transaction										$ 11,100,000	¥ 1,100,000,000
Proceeds from Divestiture of Interest in Consolidated Subsidiaries										1,000,000	100,000,000
Sale of Subsidiary - Remaining Cash to Be Received										10,100,000	1,000,000,000
Gain on sale of subsidiary to J-Devices	9,155,000	0	9,155,000	0								9,155,000
Disposal Group, Including Discontinued Operation, Foreign Currency Translation Gains (Losses)												12,600,000
Business Combination, Bargain Purchase, Gain Recognized, Amount					14,700,000
Income (Loss) from Equity Method Investments	20,036,000	1,445,000	25,797,000	1,500,000	8,800,000	8,800,000
Combined Net Gain from Sale of Subsidiary												$ 18,000,000	$ 18,000,000