Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 494,189	$ 449,946
Restricted cash	2,681	2,681
Accounts receivable, net of allowances	433,092us-gaap_AccountsReceivableNetCurrent	469,683us-gaap_AccountsReceivableNetCurrent
Inventories	227,605us-gaap_InventoryNet	223,379us-gaap_InventoryNet
Other current assets	48,383us-gaap_OtherAssetsCurrent	52,259us-gaap_OtherAssetsCurrent
Total current assets	1,205,950us-gaap_AssetsCurrent	1,197,948us-gaap_AssetsCurrent
Property, plant and equipment, net	2,167,790us-gaap_PropertyPlantAndEquipmentNet	2,206,476us-gaap_PropertyPlantAndEquipmentNet
Investments	138,218us-gaap_EquityMethodInvestments	117,733us-gaap_EquityMethodInvestments
Restricted cash	2,151	2,123
Other assets	119,767us-gaap_OtherAssetsNoncurrent	111,125us-gaap_OtherAssetsNoncurrent
Total assets	3,633,876us-gaap_Assets	3,635,405us-gaap_Assets
Current liabilities:
Short-term borrowings and current portion of long-term debt	30,000us-gaap_DebtCurrent	5,000us-gaap_DebtCurrent
Trade accounts payable	287,129us-gaap_AccountsPayableCurrent	309,025us-gaap_AccountsPayableCurrent
Capital expenditures payable	111,646amkr_Capitalexpenditurespayable	127,568amkr_Capitalexpenditurespayable
Accrued expenses	272,620us-gaap_AccruedLiabilitiesCurrent	258,997us-gaap_AccruedLiabilitiesCurrent
Total current liabilities	701,395us-gaap_LiabilitiesCurrent	700,590us-gaap_LiabilitiesCurrent
Long-term debt	1,420,677us-gaap_LongTermDebtNoncurrent	1,450,824us-gaap_LongTermDebtNoncurrent
Long-term debt, related party	75,000us-gaap_DueToRelatedPartiesNoncurrent	75,000us-gaap_DueToRelatedPartiesNoncurrent
Pension and severance obligations	153,027	152,673
Other non-current liabilities	120,193us-gaap_OtherLiabilitiesNoncurrent	125,382us-gaap_OtherLiabilitiesNoncurrent
Total liabilities	2,470,292us-gaap_Liabilities	2,504,469us-gaap_Liabilities
Commitments and contingencies (Note 17)
Amkor stockholders’ equity:
Preferred stock, $0.001 par value, 10,000 shares authorized, designated Series A, none issued	0us-gaap_PreferredStockValue	0us-gaap_PreferredStockValue
Common stock, $0.001 par value, 500,000 shares authorized, 282,439 and 282,231 shares issued, and 236,804 and 236,627 shares outstanding, in 2015 and 2014, respectively	282us-gaap_CommonStockValue	282us-gaap_CommonStockValue
Additional paid-in capital	1,880,753us-gaap_AdditionalPaidInCapital	1,878,810us-gaap_AdditionalPaidInCapital
Accumulated deficit	(488,181)	(516,962)
Accumulated other comprehensive loss	(31,629)	(32,867)
Treasury stock, at cost, 45,635 and 45,604 shares in 2015 and 2014, respectively	(213,258)us-gaap_TreasuryStockValue	(213,028)us-gaap_TreasuryStockValue
Total Amkor stockholders’ equity	1,147,967us-gaap_StockholdersEquity	1,116,235us-gaap_StockholdersEquity
Noncontrolling interests in subsidiaries	15,617us-gaap_MinorityInterest	14,701us-gaap_MinorityInterest
Total equity	1,163,584	1,130,936
Total liabilities and equity	$ 3,633,876	$ 3,635,405

Amount owed for capital expenditures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations.

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Cash and equivalents whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

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