Equity and Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Schedule of Stockholders Equity and Comprehensive Income [Line Items]
Equity, Beginning balance			$ 666,794	$ 701,221
Net income	30,329	872	44,095	12,454
Total other comprehensive (loss) income	(2,824)	1,695	(6,934)	273
Issuance of stock through employee share-based compensation plans				162
Treasury stock acquired through surrender of shares for tax withholding			(172)	(446)
Share-based compensation expense			1,182	1,437
Repurchase of common stock				(37,834)
Exchange of debt for common stock			195,034
Equity, Ending balance	899,999	677,267	899,999	677,267
Amkor [Member]
Schedule of Stockholders Equity and Comprehensive Income [Line Items]
Equity, Beginning balance			657,955	693,266
Net income			43,109	12,355
Total other comprehensive (loss) income			(6,934)	273
Issuance of stock through employee share-based compensation plans				162
Treasury stock acquired through surrender of shares for tax withholding			(172)	(446)
Share-based compensation expense			1,182	1,437
Repurchase of common stock				(37,834)
Exchange of debt for common stock			195,034
Equity, Ending balance	890,174	669,213	890,174	669,213
Noncontrolling Interest [Member]
Schedule of Stockholders Equity and Comprehensive Income [Line Items]
Equity, Beginning balance			8,839	7,955
Net income			986	99
Total other comprehensive (loss) income			0	0
Issuance of stock through employee share-based compensation plans				0
Treasury stock acquired through surrender of shares for tax withholding			0	0
Share-based compensation expense			0	0
Repurchase of common stock				0
Exchange of debt for common stock			0
Equity, Ending balance	$ 9,825	$ 8,054	$ 9,825	$ 8,054