CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 362,131	$ 767,042	$ 645,607
Other comprehensive income (loss), net of tax:
Adjustments to net unrealized gains (losses) on available-for-sale debt investments	1,785	(1,225)	(369)
Adjustments to unrealized components of defined benefit pension plans	1,685	8,604	9,834
Foreign currency translation	(3,819)	(10,658)	(16,757)
Total other comprehensive income (loss)	(349)	(3,279)	(7,292)
Comprehensive income	361,782	763,763	638,315
Comprehensive income attributable to noncontrolling interests	(2,318)	(1,219)	(2,612)
Comprehensive income attributable to Amkor	$ 359,464	$ 762,544	$ 635,703