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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
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Earnings Per Share [Abstract]      
Net income attributable to Amkor common stockholders, basic $ 354,012 $ 359,813 $ 765,823
Net income attributable to Amkor common stockholders, diluted $ 354,012 $ 359,813 $ 765,823
Weighted-average number of common shares outstanding — basic (in shares) 246,344 245,628 244,676
Effect of dilutive securities:      
Share-based awards (in shares) 1,474 1,548 1,529
Weighted-average number of common shares outstanding — diluted (in shares) 247,818 247,176 246,205
Net income attributable to Amkor per common share:      
Basic (in dollars per share) $ 1.44 $ 1.46 $ 3.13
Diluted (in dollars per share) $ 1.43 $ 1.46 $ 3.11