Revision of Previously Reported Financial Information Income Statement (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Equity in earnings of J-Devices	$ 0	$ 5,315	$ 0	$ 9,370
Net income	5,366	7,950	4,961	35,464
Net income attributable to Amkor	$ 4,713	$ 7,327	$ 3,838	$ 33,925
Basic (in dollars per share)	$ 0.02	$ 0.03	$ 0.02	$ 0.14
Diluted (in dollars per share)	$ 0.02	$ 0.03	$ 0.02	$ 0.14
Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Equity in earnings of J-Devices		$ 7,566		$ 13,804
Net income		10,201		39,898
Net income attributable to Amkor		$ 9,578		$ 38,359
Basic (in dollars per share)		$ 0.04		$ 0.16
Diluted (in dollars per share)		$ 0.04		$ 0.16
Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Equity in earnings of J-Devices		$ (2,251)		$ (4,434)
Net income		(2,251)		(4,434)
Net income attributable to Amkor		$ (2,251)		$ (4,434)
Basic (in dollars per share)		$ (0.01)		$ (0.02)
Diluted (in dollars per share)		$ (0.01)		$ (0.02)