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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		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Earnings Per Share [Abstract]
Net income attributable to Amkor common stockholders, basic	$ 122,569	$ 132,614	$ 248,363	$ 242,251
Net income attributable to Amkor common stockholders, diluted	$ 122,569	$ 132,614	$ 248,363	$ 242,251
Weighted-average number of common shares outstanding - basic (in shares)	246,480	245,740	246,239	245,571
Effect of dilutive securities:
Share-based awards (in shares)	1,442	1,389	1,559	1,509
Weighted-average number of common shares outstanding - diluted (in shares)	247,922	247,129	247,798	247,080
Net income attributable to Amkor per common share:
Basic (in dollars per share)	$ 0.50	$ 0.54	$ 1.01	$ 0.99
Diluted (in dollars per share)	$ 0.49	$ 0.54	$ 1.00	$ 0.98

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