Additional Royalties Claimed.

Name:	amkr_AdditionalRoyaltiesClaimed
Namespace Prefix:	amkr
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Commitments and Contingencies.

+ Details

Name:	amkr_CommitmentsAndContingenciesTextualsAbstract
Namespace Prefix:	amkr
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of domestic patents.

+ Details

Name:	amkr_NumberOfDomesticPatents
Namespace Prefix:	amkr
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of domestic patents under license agreement.

+ Details

Name:	amkr_NumberOfDomesticPatentsUnderLicenseAgreement
Namespace Prefix:	amkr
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of foreign patents.

+ Details

Name:	amkr_NumberOfForeignPatents
Namespace Prefix:	amkr
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of foreign patents under license agreement.

+ Details

Name:	amkr_NumberOfForeignPatentsUnderLicenseAgreement
Namespace Prefix:	amkr
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of patents on which claim is dropped.

+ Details

Name:	amkr_NumberOfPatentsOnWhichClaimIsDropped
Namespace Prefix:	amkr
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Royalties Claimed Under License Agreement For Additional Patents.

+ Details

Name:	amkr_RoyaltiesClaimedUnderLicenseAgreementForAdditionalPatents
Namespace Prefix:	amkr
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Royalties owed net of offsets.

+ Details

Name:	amkr_RoyaltiesOwedNetOfOffsets
Namespace Prefix:	amkr
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Unpaid Amount Of Royalties.

+ Details

Name:	amkr_UnpaidAmountOfRoyalties
Namespace Prefix:	amkr
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_EscrowDeposit
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount borrowed under the credit facility as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 22
-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityAmountOutstanding
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ Details

Name:	us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 2, 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 22
-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 22
-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

This element represents the expenses incurred by the entity which are directly related and attributable to receiving an award in settlement of litigation.

+ Details

Name:	us-gaap_LitigationSettlementExpense
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

This element represents the gross amount awarded, to be received by, or to be remitted to the entity in settlement of litigation occurring during the period.

+ Details

Name:	us-gaap_LitigationSettlementGross
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9, 10, 11, 12
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14557-108349

+ Details

Name:	us-gaap_LossContingencyEstimateOfPossibleLoss
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The total amount of pending claims pertaining to a loss contingency accrual as of the balance sheet date.

+ References

+ Details

Name:	us-gaap_LossContingencyPendingClaimsNumber
Namespace Prefix:	us-gaap
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Commitments and Contingencies (Details) (USD $)				1 Months Ended	6 Months Ended		6 Months Ended
Commitments and Contingencies (Details) (USD $)	Jun. 30, 2011 Senior Secured Revolving Credit Facility [Member]	Dec. 31, 2010 Senior Secured Revolving Credit Facility [Member]	Jun. 30, 2011 Letter of Credit [Member]	Jul. 31, 2011 Tessera Inc [Member]	Jun. 30, 2011 Tessera Inc [Member]	Aug. 31, 2011 Tessera Inc [Member]	Jun. 30, 2011 Tessera Inc Legal Proceedings [Member]	Jun. 30, 2011 Carsem Legal Proceedings [Member]
Line of Credit Facility [Line Items]
Credit facility, borrowing capacity	$ 100,000,000		$ 25,000,000
Credit facility, amount outstanding	0	0	400,000
Credit facility, additional borrowing available			24,600,000
Commitments and Contingencies (Textuals) [Abstract]
Final damages awarded							60,600,000
Number of valid asserted patent claims								21
Additional royalties claimed by Tessera for packages				18,000,000
Final award, plus interest and royalties					64,700,000
Unpaid Amount of Royalties					700,000
Number of foreign patents						4
Number of domestic patents						10
Amount of deposit in escrow account					17,000,000
Amount of dispute					100,000,000
Royalties Claimed Under License Agreement For Additional Patents					400,000,000
Royalties owed net of offsets					$ 125,000
Number of U.S patents under license agreement					13
Number of foreign patents under license agreement					6
Number of patents on which claim is dropped					5