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Earnings Per Share - Schedule of computation of basic and diluted earnings per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Earnings Per Share [Abstract]
Net income attributable to Amkor common stockholders, basic	$ 21,128	$ 58,897
Net income attributable to Amkor common stockholders, diluted	$ 21,128	$ 58,897
Weighted-average number of common shares outstanding - basic (in shares)	246,854	246,008
Effect of dilutive securities:
Share-based awards (in shares)	991	1,606
Weighted-average number of common shares outstanding - diluted (in shares)	247,845	247,614
Net income attributable to Amkor per common share:
Basic (in dollars per share)	$ 0.09	$ 0.24
Diluted (in dollars per share)	$ 0.09	$ 0.24

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