Pension and Severance Plans Textuals (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Cost Recognized	$ 2.9	$ 2.9
Provision of Severance Benefits		$ 5.1

Provision related to lump-sum payment upon termination of employment (employees and directors), based on length of service, seniority and average monthly wages at the time of termination, which is not related to restructurings, pension plans or other post retirement benefit plans. Severance benefits are estimated assuming all eligible employees were to terminate their employment at the balance sheet date.

No definition available.

Name:	amkr_ProvisionOfSeveranceBenefits
Namespace Prefix:	amkr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration