Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (9,144)	$ (405)
Other comprehensive income (loss), net of tax:
Adjustments to unrealized components of defined benefit pension plans	230	24
Foreign currency translation	13,586	19,323
Total other comprehensive income (loss)	13,816	19,347
Comprehensive income	4,672	18,942
Comprehensive income attributable to non-controlling interests	(862)	(470)
Comprehensive income attributable to Amkor	$ 3,810	$ 18,472