Pension and Severance Plans (Korean Severance Plan) (Details) (Korean Severance Plan [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2009
Korean Severance Plan [Member]
Deferred Compensation Liability, Current and Noncurrent [Roll Forward]
Balance	$ 126,762	$ 106,715		$ 88,899
Provision of severance benefits	26,550	19,667	26,705
Severance payments	(10,402)	(8,520)	(6,717)
Loss (gain) on foreign currency	2,463	8,900	(2,172)
Balance	145,373	126,762	106,715	88,899
Payments remaining with the National Pension Fund	(241)	(249)	(239)
Total severance obligation balance at end of year	145,132	126,513	106,476
Less current portion of accrued severance obligation (Note 13)	11,197	9,516	7,476
Non-current portion of severance obligation	$ 133,935	$ 116,997	$ 99,000

Name:	amkr_DeferredCompensationLiabilityCurrentAndNoncurrentRollForward
Namespace Prefix:	amkr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Lump-sum payments related to 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.

+ References

No definition available.

+ Details

Name:	amkr_PaymentsForEmployeeSeverance
Namespace Prefix:	amkr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Payments remaining with the Korean National Pension Fund.

+ References

No definition available.

+ Details

Name:	amkr_PaymentsRemainingWithLocalPensionFund
Namespace Prefix:	amkr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

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.

+ References

No definition available.

+ Details

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

- Definition

Foreign currency translation adjustments related to the transactions for 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.

+ References

No definition available.

+ Details

Name:	amkr_SeveranceBenefitsTranslationAdjustments
Namespace Prefix:	amkr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Severance Obligation After Local Pension Fund Payments

+ References

No definition available.

+ Details

Name:	amkr_SeveranceObligationAfterLocalPensionFundPayments
Namespace Prefix:	amkr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements payable after one year (or the normal operating cycle, if longer). Represents currently earned compensation under cash arrangements (such as a profit-sharing plan, rabbi trust, and employee contract--excluding equity-based arrangements) that is not actually paid until a later date.

+ References

No definition available.

+ Details

Name:	us-gaap_DeferredCompensationCashbasedArrangementsLiabilityClassifiedNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements payable within one year (or the normal operating cycle, if longer). Represents currently earned compensation under cash arrangements (such as a profit-sharing plan, rabbi trust, and employee contract--excluding equity-based arrangements) that is not actually paid until a later date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 710

-SubTopic 10

-Section 30

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20028-108363

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 710

-SubTopic 10

-Section 25

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=6409836&loc=d3e19793-108362

+ Details

Name:	us-gaap_DeferredCompensationCashBasedArrangementsLiabilityCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements. Represents currently earned compensation under cash arrangements (such as a profit-sharing plan, rabbi trust, and employee contract--excluding equity-based arrangements) that is not actually paid until a later date.

+ References

No definition available.

+ Details

Name:	us-gaap_DeferredCompensationCashbasedArrangementsLiabilityCurrentAndNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant