Debt Instrument Face Amount Related Party

No definition available.

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

- Definition

Amount of long-term debt, including related party debt, before deduction of unamortized discount or premium.

+ References

No definition available.

+ Details

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

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentDescriptionOfVariableRateBasis
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
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.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

+ References

+ Details

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

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

+ Details

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

- 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

+ 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

+ Details

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

- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_RepaymentsOfLinesOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Debt (Details) - USD ($)	1 Months Ended	9 Months Ended
Debt (Details) - USD ($)	Oct. 31, 2016	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Nov. 30, 2015	May 31, 2015	Jun. 30, 2012
Debt Instrument [Line Items]
Repayments of Lines of Credit		$ 155,000,000	$ 100,000,000
Long-term Debt Including Related Party, Gross		$ 1,582,072,000		$ 1,590,655,000
Subsidiary Term Loans [Member] \| KOREA, REPUBLIC OF \| Term loan, LIBOR plus 2.60%, due May 2018
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		2.60%
Debt, interest rate description		LIBOR plus 2.60%
Long-term Debt Including Related Party, Gross		$ 120,000,000		120,000,000
Subsidiary Term Loans [Member] \| KOREA, REPUBLIC OF \| Term loan, LIBOR plus 2.70%, due December 2019
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		2.70%
Debt, interest rate description		LIBOR plus 2.70%
Long-term Debt Including Related Party, Gross		$ 70,000,000		70,000,000
Subsidiary Term Loans [Member] \| KOREA, REPUBLIC OF \| Term loan, foreign currency funding-linked base rate plus 1.35%, due May 2020
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.35%
Debt, interest rate description		foreign currency funding-linked base rate plus 1.35%
Long-term Debt Including Related Party, Gross		$ 150,000,000		150,000,000
Subsidiary Term Loans [Member] \| KOREA, REPUBLIC OF \| Term loan, foreign currency funding-linked base rate plus 1.35%, due May 2020
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.35%
Debt, interest rate description		foreign currency funding-linked base rate plus 1.35%
Long-term Debt Including Related Party, Gross		$ 80,000,000		80,000,000
Subsidiary Term Loans [Member] \| KOREA, REPUBLIC OF \| Term loan, fund floating rate plus 1.60%, due June 2020 (3)
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.60%
Debt, interest rate description		fund floating rate plus 1.60%
Total effective rate (percentage)		2.63%
Debt Instrument, Unused Borrowing Capacity, Amount		$ 75,000,000				$ 150,000,000
Long-term Debt Including Related Party, Gross		$ 75,000,000		40,000,000
Subsidiary Term Loans [Member] \| JAPAN \| Short-term term loans, variable rate (4)
Debt Instrument [Line Items]
Total effective rate (percentage)		0.36%
Debt Instrument, Unused Borrowing Capacity, Amount		$ 2,500,000
Long-term Debt Including Related Party, Gross		$ 15,343,000		15,582,000
Subsidiary Term Loans [Member] \| JAPAN \| Short-term term loans, fixed rate at 0.50%
Debt Instrument [Line Items]
Stated interest rate		0.50%
Long-term Debt Including Related Party, Gross		$ 0		5,808,000
Subsidiary Term Loans [Member] \| JAPAN \| Term loans, TIBOR plus 1.00%, due November 2016
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.00%
Debt, interest rate description		TIBOR plus 1.00%
Long-term Debt Including Related Party, Gross		$ 494,000		2,800,000
Subsidiary Term Loans [Member] \| JAPAN \| Term loans, fixed rate at 0.53%, due April 2018
Debt Instrument [Line Items]
Stated interest rate		0.53%
Long-term Debt Including Related Party, Gross		$ 26,264,000		31,465,000
Senior notes (Level 1) \| 6.625% Senior notes, due June 2021, $75 million related party
Debt Instrument [Line Items]
Stated interest rate		6.625%
Debt Instrument Face Amount Related Party		$ 75,000,000
Long-term Debt Including Related Party, Gross		$ 400,000,000		400,000,000
Senior notes (Level 1) \| 6.375% Senior notes, due October 2022
Debt Instrument [Line Items]
Stated interest rate		6.375%
Long-term Debt Including Related Party, Gross		$ 524,971,000		525,000,000
Revolving Credit Facility [Member] \| Line of Credit [Member] \| $200 million revolving credit facility, LIBOR plus 1.25%-1.75%, due December 2019 (1)
Debt Instrument [Line Items]
Credit facility, borrowing capacity		$ 200,000,000.0
Debt, interest rate description		LIBOR plus 1.25%-1.75%
Total effective rate (percentage)		2.375%
Line of Credit Facility, Remaining Borrowing Capacity		$ 99,500,000
Long-term Debt Including Related Party, Gross		100,000,000		100,000,000
Current borrowing capacity		200,000,000
Revolving Credit Facility [Member] \| Line of Credit [Member] \| KOREA, REPUBLIC OF \| $100 million revolving credit facility, foreign currency funding-linked base rate plus 1.60%, due June 2017 (2)
Debt Instrument [Line Items]
Credit facility, borrowing capacity		$ 100,000,000					$ 41,000,000
Debt Instrument, Basis Spread on Variable Rate		1.60%
Debt, interest rate description		foreign currency funding-linked base rate plus 1.60%
Total effective rate (percentage)		3.17%
Line of Credit Facility, Remaining Borrowing Capacity		$ 100,000,000
Long-term Debt Including Related Party, Gross		$ 0		40,000,000
Revolving Credit Facility [Member] \| Line of Credit [Member] \| TAIWAN, PROVINCE OF CHINA \| Revolving credit facility, TAIFX plus a bank-determined spread, due November 2020 (5)
Debt Instrument [Line Items]
Credit facility, borrowing capacity					$ 39,000,000
Debt, interest rate description		TAIFX plus a bank-determined spread
Total effective rate (percentage)		2.01%
Line of Credit Facility, Remaining Borrowing Capacity		$ 19,000,000
Long-term Debt Including Related Party, Gross		20,000,000		$ 10,000,000
Letter of Credit [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount		500,000
Letter of Credit [Member] \| $200 million revolving credit facility, LIBOR plus 1.25%-1.75%, due December 2019 (1)
Debt Instrument [Line Items]
Credit facility, borrowing capacity		$ 25,000,000
Maximum [Member] \| Subsidiary Term Loans [Member] \| JAPAN \| Short-term term loans, variable rate (4)
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.38%
Maximum [Member] \| Revolving Credit Facility [Member] \| Line of Credit [Member] \| $200 million revolving credit facility, LIBOR plus 1.25%-1.75%, due December 2019 (1)
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.75%
Minimum [Member] \| Subsidiary Term Loans [Member] \| JAPAN \| Short-term term loans, variable rate (4)
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.30%
Minimum [Member] \| Revolving Credit Facility [Member] \| Line of Credit [Member] \| $200 million revolving credit facility, LIBOR plus 1.25%-1.75%, due December 2019 (1)
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.25%
Subsequent Event [Member] \| Revolving Credit Facility [Member] \| Line of Credit [Member] \| $200 million revolving credit facility, LIBOR plus 1.25%-1.75%, due December 2019 (1)
Debt Instrument [Line Items]
Repayments of Lines of Credit	$ 40,000,000