Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 116,459	$ 5,366	$ 107,315	$ 4,961
Other comprehensive income (loss), net of tax:
Adjustments to unrealized components of defined benefit pension plans	18	23	248	47
Foreign currency translation	(833)	26,955	12,753	46,278
Total other comprehensive income (loss)	(815)	26,978	13,001	46,325
Comprehensive income	115,644	32,344	120,316	51,286
Comprehensive income attributable to non-controlling interests	(952)	(653)	(1,814)	(1,123)
Comprehensive income attributable to Amkor	$ 114,692	$ 31,691	$ 118,502	$ 50,163