Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 55,630	$ 61,141	$ 162,945	$ 66,102
Other comprehensive income (loss), net of tax:
Adjustments to unrealized components of defined benefit pension plans	15	24	263	71
Foreign currency translation	(969)	5,883	11,784	52,161
Total other comprehensive income (loss)	(954)	5,907	12,047	52,232
Comprehensive income	54,676	67,048	174,992	118,334
Comprehensive income attributable to non-controlling interests	(1,195)	(1,052)	(3,009)	(2,175)
Comprehensive income attributable to Amkor	$ 53,481	$ 65,996	$ 171,983	$ 116,159