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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Earnings Per Share [Abstract]        
Net income attributable to Amkor common stockholders, basic $ 126,589 $ 122,569 $ 202,134 $ 248,363
Net income attributable to Amkor common stockholders, diluted $ 126,589 $ 122,569 $ 202,134 $ 248,363
Weighted-average number of common shares outstanding - basic (in shares) 247,158 246,480 247,035 246,239
Effect of dilutive securities:        
Share-based awards (in shares) 1,144 1,442 1,019 1,559
Weighted-average number of common shares outstanding - diluted (in shares) 248,302 247,922 248,054 247,798
Net income attributable to Amkor per common share:        
Basic (in dollars per share) $ 0.51 $ 0.50 $ 0.82 $ 1.01
Diluted (in dollars per share) $ 0.51 $ 0.49 $ 0.81 $ 1.00