CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement [Abstract]
Net sales	$ 6,503,065	$ 7,091,585	$ 6,138,329
Cost of sales	5,559,912	5,761,598	4,912,775
Gross profit	943,153	1,329,987	1,225,554
Selling, general and administrative	295,393	283,372	296,084
Research and development	177,473	149,429	166,037
Total operating expenses	472,866	432,801	462,121
Operating income	470,287	897,186	763,433
Interest expense	59,000	58,563	51,508
Other (income) expense, net	(32,554)	(18,309)	(3,141)
Total other expense, net	26,446	40,254	48,367
Income before taxes	443,841	856,932	715,066
Income tax expense	81,710	89,890	69,459
Net income	362,131	767,042	645,607
Net income attributable to noncontrolling interests	(2,318)	(1,219)	(2,612)
Net income attributable to Amkor	$ 359,813	$ 765,823	$ 642,995
Net income attributable to Amkor per common share:
Basic (in dollars per share)	$ 1.46	$ 3.13	$ 2.64
Diluted (in dollars per share)	$ 1.46	$ 3.11	$ 2.62
Shares used in computing per common share amounts:
Basic (in shares)	245,628	244,676	243,878
Diluted (in shares)	247,176	246,205	245,704