Equity and Comprehensive Income (Details) (USD $) In Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Schedule of Stockholders Equity and Comprehensive Income [Line Items]
Equity, Beginning balance			$ 636,681	$ 389,701
Comprehensive income:
Net income	27,323	78,370	67,534	181,386
Other comprehensive income:
Pension liability adjustment, net of tax			(1,127)
Adjustments to unrealized components of defined benefit pension plan, net of tax			348	223
Cumulative translation adjustment			4,346	6,245
Total other comprehensive income			3,567	6,468
Comprehensive income			71,101	187,854
Treasury stock acquired through surrender of shares for tax withholding			(793)	(274)
Issuance of stock through employee share-based compensation plans			933	989
Share-based compensation expense			4,047	2,733
Repurchase of Common Stock			(48,938)
Conversion of debt to common stock			100,497
Equity, Ending balance	763,528	581,003	763,528	581,003
Amkor [Member]
Schedule of Stockholders Equity and Comprehensive Income [Line Items]
Equity, Beginning balance			630,013	383,209
Comprehensive income:
Net income			66,958	181,367
Other comprehensive income:
Pension liability adjustment, net of tax			(1,127)
Adjustments to unrealized components of defined benefit pension plan, net of tax			348	223
Cumulative translation adjustment			4,346	6,245
Total other comprehensive income			3,567	6,468
Comprehensive income			70,525	187,835
Treasury stock acquired through surrender of shares for tax withholding			(793)	(274)
Issuance of stock through employee share-based compensation plans			933	989
Share-based compensation expense			4,047	2,733
Repurchase of Common Stock			(48,938)
Conversion of debt to common stock			100,497
Equity, Ending balance	756,284	574,492	756,284	574,492
Noncontrolling Interest [Member]
Schedule of Stockholders Equity and Comprehensive Income [Line Items]
Equity, Beginning balance			6,668	6,492
Comprehensive income:
Net income			576	19
Other comprehensive income:
Pension liability adjustment, net of tax			0
Adjustments to unrealized components of defined benefit pension plan, net of tax				0
Cumulative translation adjustment			0	0
Total other comprehensive income			0	0
Comprehensive income			576	19
Treasury stock acquired through surrender of shares for tax withholding			0	0
Issuance of stock through employee share-based compensation plans			0	0
Share-based compensation expense			0	0
Repurchase of Common Stock			0
Conversion of debt to common stock			0
Equity, Ending balance	$ 7,244	$ 6,511	$ 7,244	$ 6,511

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The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the economic entity, including both controlling (parent) and noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, including any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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The increase (decrease) in accumulated comprehensive income during the period related to pension and other postretirement benefit plans, after tax. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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