Document Information [Table] Document Information, Document [Axis] Document Information, Document [Axis] Document [Domain] Document [Domain] Document Information [Line Items] Document Information [Line Items] Document and Entity Information [Abstract] Document And Entity Information. Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Current Fiscal Year End Date Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Filer Category Entity Filer Category Entity Public Float Entity Public Float Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Statement of Cash Flows [Abstract] Statement [Table] Statement [Table] Statement, Scenario [Axis] Statement, Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Statement [Line Items] Statement [Line Items] Non cash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Interest rate of convertible subordinated notes Debt Conversion, Converted Instrument, Rate Statement of Financial Position [Abstract] Amkor stockholders' equity: Stockholders' Equity Attributable to Parent [Abstract] Preferred stock designated Series A, par value Preferred Stock, Par or Stated Value Per Share Preferred stock designated Series A, shares authorized Preferred Stock, Shares Authorized Preferred stock designated Series A, shares issued Preferred Stock, Shares Issued Common stock, par value Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Issued Common stock, shares outstanding Common Stock, Shares, Outstanding Treasury stock, shares Treasury Stock, Shares Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Expected life Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Weighted average grant date fair value per option granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Earnings Per Share [Abstract] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities Excluded from Computation of Earnings Per Share, by Antidilutive Securities [Axis] Antidilutive Securities Excluded from Computation of Earnings Per Share, by Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Stock Options [Member] Stock Options [Member] Convertible Notes Due 2011 [Member] Convertible Notes Due 2011 [Member] convertible notes due 2011. Convertible Notes Due 2013 [Member] Convertible Notes Due 2013 [Member] convertible notes due 2013. Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Total potentially dilutive shares Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Equity [Abstract] Treasury Stock Treasury Stock [Text Block] Compensation and Retirement Disclosure [Abstract] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans [Domain] Defined Benefit Plans and Other Postretirement Benefit Plans [Domain] Other Postretirement Benefit Plans, Defined Benefit [Member] Other Postretirement Benefit Plans, Defined Benefit [Member] Foreign Pension Plans [Member] Foreign Postretirement Benefit Plans, Defined Benefit [Member] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Service cost Defined Benefit Plan, Service Cost Interest cost Defined Benefit Plan, Interest Cost Expected return on plan assets Defined Benefit Plan, Expected Return on Plan Assets Amortization of transitional obligation Defined Benefit Plan, Amortization of Transition Obligations (Assets) Amortization of prior service cost Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Recognized actuarial loss (gain) Defined Benefit Plan, Actuarial Net (Gains) Losses Net periodic pension cost Defined Benefit Plan, Net Periodic Benefit Cost Curtailments Defined Benefit Plan, Curtailments Settlements Defined Benefit Plan, Settlements, Benefit Obligation Total Pension Expense Pension Expense Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Depreciation and amortization Depreciation, Depletion and Amortization Loss on debt retirement, net Gains Losses On Extinguishment Of Debt Attributable To Financing Activities Amount represents the difference between the fair value of the payments made related to financing activities and the carrying amount of the debt at the time of its extinguishment. Other operating activities and non-cash items Other Noncash Income (Expense) Changes in assets and liabilities Increase (Decrease) in Operating Capital Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Purchases of property, plant, and equipment Payments to Acquire Property, Plant, and Equipment Proceeds from the sale of property, plant and equipment Proceeds from Sale of Property, Plant, and Equipment Financing lease payment from unconsolidated affiliate Financing lease payment from unconsolidated affiliate Cash proceeds received during the period for direct financing lease to unconsolidated affiliate. Other investing activities Payments for (Proceeds from) Other Investing Activities Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Borrowings under revolving credit facilities Proceeds from Lines of Credit Payments under revolving credit facilities Repayments of Lines of Credit Proceeds from issuance of short-term working capital facility Proceeds from Other Short-term Debt Payments of short-term working capital facility Repayments of Other Short-term Debt Proceeds from issuance of long-term debt Proceeds from Issuance of Other Long-term Debt Proceeds from issuance of long-term debt, related party Proceeds from Related Party Debt Payments of long-term debt, net of certain redemption premiums and discounts Repayments of Long-term Debt Payments for debt issuance costs Payments of Debt Issuance Costs Payments for repurchase of common stock Payments for Repurchase of Common Stock Proceeds from issuance of stock through share-based compensation plans Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options Payments of tax withholding for restricted shares Payments Related to Tax Withholding for Share-based Compensation Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Effect of exchange rate fluctuations on cash and cash equivalents Effect of Exchange Rate on Cash and Cash Equivalents Net increase in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents, beginning of period Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents, end of period Supplemental disclosures of cash flow information: Supplemental Cash Flow Information [Abstract] Cash paid during the period for: Cash Paid During Period For Abstract Cash Paid During Period For Interest Interest Paid Income taxes Income Taxes Paid Non cash investing and financing activities: Noncash Investing and Financing Items [Abstract] Common stock issuance for conversion of related party 6.25% convertible subordinated notes due December 2013 Debt Conversion, Converted Instrument, Amount Goodwill and Intangible Assets Disclosure [Abstract] Intangible Assets Intangible Assets Disclosure [Text Block] Class of Treasury Stock [Table] Class of Treasury Stock [Table] Equity, Class of Treasury Stock [Axis] Equity, Class of Treasury Stock [Axis] Class of Treasury Stock [Domain] Class of Treasury Stock [Domain] Stock Repurchase Program [Member] Stock Repurchase Program [Member] Equity, Class of Treasury Stock [Line Items] Equity, Class of Treasury Stock [Line Items] Stock Repurchase Program, Authorized Amount Stock Repurchase Program, Authorized Amount Treasury Stock, Shares, Acquired Treasury Stock, Shares, Acquired Treasury Stock, Value, Acquired, Cost Method Treasury Stock, Value, Acquired, Cost Method Share Repurchase Program Commission Incurred Share Repurchase Program Commission Incurred Share Repurchase Program Commission Incurred Treasury Stock Acquired, Average Cost Per Share Treasury Stock Acquired, Average Cost Per Share Stock Repurchase Program, Remaining Authorized Repurchase Amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Other Accrued Liabilities, Current Other Accrued Liabilities, Current Shares Paid for Tax Withholding for Share Based Compensation Shares Paid for Tax Withholding for Share Based Compensation Adjustments Related to Tax Withholding for Share-based Compensation Adjustments Related to Tax Withholding for Share-based Compensation Inventory Disclosure [Abstract] Inventories Schedule of Inventory, Current [Table Text Block] Fair Value Disclosures [Abstract] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value, Measurements, Fair Value Hierarchy [Domain] Total Estimate of Fair Value, Fair Value Disclosure [Member] Quoted Prices in Active Markets for Identical Assets Fair Value, Inputs, Level 1 [Member] Significant Other Observable Inputs Fair Value, Inputs, Level 2 [Member] Significant Unobservable Inputs Fair Value, Inputs, Level 3 [Member] Fair Value by Measurement Frequency [Axis] Fair Value by Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair value assets measured on recurring basis Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] Cash equivalent money market funds Cash and Cash Equivalents, Fair Value Disclosure Restricted cash Restricted Cash Fair Value Disclosure Restricted Cash Fair Value Disclosure Investments, All Other Investments [Abstract] Current (Other accounts receivable) Capital Leases, Lessor Balance Sheet, Net Investment in Direct Financing Leases, Current Non-current (Other assets) Capital Leases, Lessor Balance Sheet, Net Investment in Direct Financing Leases, Noncurrent Total lease receivable, net Capital Leases, Net Investment in Direct Financing Leases Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Valuation of money market funds and restricted cash using quoted market prices in active markets for identical assets Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Financial instruments that are not recorded at fair value Schedule Of Fair Value Carrying Value Debt [Table Text Block] Schedule Of Fair Value Carrying Value Debt [Table Text Block] Restructuring and Related Activities [Abstract] Schedule of Restructuring and Related Costs [Table] Schedule of Restructuring and Related Costs [Table] Restructuring Cost and Reserve [Axis] Restructuring Cost and Reserve [Axis] Type of Restructuring [Domain] Type of Restructuring [Domain] Philipines Manufacturing Operations [Member] Philipines Manufacturing Operations [Member] Singapore Manufacturing Operations [Member] Singapore Manufacturing Operations [Member] Singapore Manufacturing Operations [Member] Restructuring and Related Cost by Location of Income Statement [Axis] Restructuring and Related Cost by Location of Income Statement [Axis] Restructuring and Related Cost by Location of Income Statement [Axis] Restructuring and Related Cost by Location of Income Statement [Domain] Restructuring and Related Cost by Location of Income Statement [Domain] Restructuring and Related Cost by Location of Income Statement [Domain] Cost of sales [Member] Cost of Sales [Member] Selling, general and administrative expenses [Member] Selling General and Administrative [Member] selling general and administrative [Member] Restructuring Cost and Reserve [Line Items] Selling and Marketing Expense Selling and Marketing Expense General and Administrative Expense General and Administrative Expense Severance costs Severance Costs Asset retirement obligation related to the leased property Asset Retirement Obligation Cash received for sale of facility in Singapore Proceeds from Divestiture of Businesses Number of employees affected due to restructuring activities Restructuring and Related Cost, Expected Number of Positions Eliminated Defined Benefit Plan Curtailment And Settlement Defined Benefit Plan Curtailment And Settlement Defined Benefit Plan Curtailment And Settlement Gain on sale of business Gain On Sale Of business Gain On Sale Of business Asset impairment cost Asset Impairment Charges Segment Reporting [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Statement, Business Segments [Axis] Statement, Business Segments [Axis] Segment [Domain] Segment [Domain] Packaging [Member] Packaging [Member] Packaging. Test [Member] Test [Member] Test. Other [Member] All Other Segments [Member] Reportable Segment [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Net sales Revenue, Net Gross profit Gross Profit Property, plant and equipment, gross Property, Plant and Equipment, Gross Number of reportable segments Number Of Reportable Segments Number of reportable segments. Commitments and Contingencies Disclosure [Abstract] Loss Contingencies [Table] Loss Contingencies [Table] Loss Contingencies By Nature Of Contingency [Axis] Loss Contingencies by Nature of Contingency [Axis] Loss Contingency Nature [Domain] Loss Contingency, Nature [Domain] Tessera Inc [Member] Tessera Inc [Member] Tessera Inc . Tessera Inc Legal Proceedings [Member] Tessera Inc Legal Proceedings [Member] Tessera inc legal proceedings. Carsem Legal Proceedings [Member] Carsem Legal Proceedings [Member] Carsem legal proceedings. Line of Credit Facility [Axis] Line of Credit Facility [Axis] Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Senior Secured Revolving Credit Facility [Member] Senior Secured Credit Facilities [Member] Senior secured credit facilities. Letter of Credit [Member] Letter of Credit [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Credit facility, borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Line of Credit Facility, Amount Outstanding Line of Credit Facility, Amount Outstanding Credit facility, additional borrowing available Line of Credit Facility, Remaining Borrowing Capacity Final damages awarded Litigation Settlement, Gross Final award, plus interest and royalties Litigation Settlement, Expense Additional royalties claimed by Tessera for packages Additional Royalties Claimed Additional Royalties Claimed. Unpaid Amount of Royalties Unpaid Amount Of Royalties Unpaid Amount Of Royalties. Royalties owed net of offsets Royalties Owed Net Of Offsets Royalties owed net of offsets. Amount of dispute Loss Contingency, Estimate of Possible Loss Royalties Claimed Under License Agreement For Additional Patents Royalties Claimed Under License Agreement For Additional Patents Royalties Claimed Under License Agreement For Additional Patents. Amount of deposit in escrow account Escrow Deposit Number of valid asserted patent claims Loss Contingency, Pending Claims, Number Number of foreign patents Number of foreign patents Number of foreign patents. Number of domestic patents Number Of Domestic Patents Number of domestic patents. Number of U.S patents under license agreement Number Of domestic Patents Under License Agreement Number Of domestic patents under license agreement. Number of foreign patents under license agreement Number of foreign patents under license agreement Number of foreign patents under license agreement. Number of patents on which claim is dropped Number of patents on which claim is dropped Number of patents on which claim is dropped. Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Award Type and Plan Name [Axis] Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Award Type and Plan Name [Axis] Share-based Compensation Arrangements by Share-based Payment Award, Award Type and Plan Name [Domain] Share-based Compensation Arrangements by Share-based Payment Award, Award Type and Plan Name [Domain] Stock options [Member] Employee stock option [Member] Employee Stock Option [Member] Restricted shares [Member] Restricted Stock [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Unrecognized compensation expense from Restricted Stock Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized Restricted shares granted to employees under the 2007 Equity Incentive Plan Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Weighted-average period of recognition of unrecognized compensation expense Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition Fair value of shares upon vesting Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value Intrinsic value of options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value Cash received for stock option exercises Tax benefits realized Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options Cost of shares withheld to satisfy tax withholding obligations Share Based Compensation Arrangement By Share Based Payment Award Cost Of Shares Withheld To Satisfy Tax Withholding Obligations Share Based Compensation Arrangement By Share Based Payment Award Cost Of Shares Withheld To Satisfy Tax Withholding Obligations Components of net periodic pension cost Schedule of Net Benefit Costs [Table Text Block] Property, Plant and Equipment [Abstract] Schedule of Property, Plant and Equipment [Table] Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment by Type [Axis] Property, Plant and Equipment by Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Land [Member] Land [Member] Land use rights [Member] Land Use and Rights [Member] Land Use and Rights [Member] Buildings and improvements [Member] Building and Building Improvements [Member] Machinery and equipment [Member] Machinery and Equipment [Member] Software and computer equipment [Member] Software and Computer Equipment [Member] Software and Computer Equipment [Member] Furniture, fixtures and other equipment [Member] Furniture and Fixtures [Member] Construction in progress [Member] Construction in Progress [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Less accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Total property, plant and equipment, net Property, Plant and Equipment, Net Inventories Inventory, Net, Combining Work in Process and Raw Materials Alternative [Abstract] Raw materials and purchased components Inventory, Raw Materials, Net of Reserves Work-in-process Inventory, Work in Process, Net of Reserves Total inventories Inventory, Net Payables and Accruals [Abstract] Summarized Accrued expenses Schedule of Accrued Liabilities [Table Text Block] Impairment losses on property, plant, and equipment included in cost of sales Impairment of Long-Lived Assets Held-for-use Equity and Comprehensive Income Stockholders' Equity Note Disclosure [Text Block] Earnings Per Share Earnings Per Share [Text Block] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping, Disclosure Item Amounts [Axis] Fair Value, by Balance Sheet Grouping, Disclosure Item Amounts [Axis] Fair Value, Disclosure Item Amounts [Domain] Fair Value, Disclosure Item Amounts [Domain] Carrying value of debt [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] Fair value of debt [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Debt, Long-term and Short-term, Combined Amount, Total Debt, Long-term and Short-term, Combined Amount Summary of all common stock option activity Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Number of Shares Outstanding beginning balance Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Weighted Average Exercise Price Per Share Outstanding beginning balance Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Number of Shares Granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures Weighted Average Exercise Price Per Share Granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Number of Shares Exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Weighted Average Exercise Price Per Share Exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Number of Shares Forfeited or expired Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Weighted Average Exercise Price Per Share Forfeited or expired Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Number of Shares Outstanding ending balance Weighted Average Exercise Price Per Share Outstanding ending balance Weighted Average Exercise Price Per Share average contractual term Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Aggregate intrinsic value Outstanding ending balance Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Number of Shares Fully vested and expected to vest Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Weighted Average Exercise Price Per Share Fully vested and expected to vest Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Average Remaining Contractual Term Fully vested and expected to vest Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Aggregate intrinsic value Fully vested and expected to vest Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Number of Shares Exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Weighted Average Exercise Price Per Share Exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Average Remaining Contractual Term Exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Aggregate intrinsic value Exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Related Party Transactions [Abstract] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Legal Entity [Axis] Entity [Domain] Acqutek [Member] Acqutek [Member] Related Party Transactions, by Related Party [Axis] Related Party Transactions, by Related Party [Axis] Related Party [Domain] Related Party [Domain] Board of Directors Chairman [Member] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Related Party Investment, Ownership Percentage Related Party Investment, Ownership Percentage Related Party Investment, Ownership Percentage Payments For Inventory Payments For Inventory Purchases Of Inventory In period Accounts Payable, Current Accounts Payable, Current Related Party Percentage Of Ownership Shares Sold Related Party Percentage Of Ownership Shares Sold Korean Severance Plan [Member] Korean Severance Plan [Member] Korean Severance Plan [Member] Contributions to pension plans Defined Benefit Plan, Contributions by Employer Expected Employer Contribution during remaining part of Year Defined Benefit Plan Expected Contributions By Employer During Remaining Part of Year Defined Benefit Plan Expected Contributions By Employer During Remaining Part of Year Provision for Severance Benefit Supplemental Postemployment Benefits Severance Expense Supplemental Postemployment Benefits Severance Expense Pension and severance obligations Pension and Other Postretirement and Postemployment Benefit Plans, Liabilities, Noncurrent Accrued Severance Plan Minimum Service Period Accrued Severance Plan Minimum Service Period Accrued Severance Plan Minimum Service Period Total pension and severance obligations Pension And Other Postretirement And Postemployment Benefit Plan Liabilities Current And Noncurrent Pension And Other Postretirement And Postemployment Benefit Plan Liabilities Current And Noncurrent Share-Based Compensation Plans Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Amortization of identifiable intangible assets Finite-Lived Intangible Assets, Amortization Expense Accrued Expenses Accounts Payable and Accrued Liabilities Disclosure [Text Block] Changes in equity and comprehensive income attributable to both Company and noncontrolling interests Schedule Of Stockholders Equity And Other Comprehensive Income [Table Text Block] Schedule Of Stockholders Equity And Other Comprehensive Income [Table Text Block] Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Senior Notes Due June 2016 [Member] Senior notes due June 2016 Senior Notes Due May 2018 [Member] Senior Notes Due May 2018 [Member] Senior notes. Senior Notes Due 2021 [Member] Senior notes due 2021. Convertible Senior Subordinated Notes Due May 2011 [Member] Convertible Senior Subordinated Notes Due May 2011 [Member] Convertible senior subordinated notes. Convertible Senior Subordinated Notes Due April 2014 [Member] Convertible Senior Subordinated Notes Due April 2014 [Member] Convertible senior subordinated notes due April 2014. Convertible Subordinated Notes Due December 2013 [Member] Convertible Subordinated Notes Due December 2013 [Member] Convertible subordinated notes due December 2013. Term Loan Due April 2014 [Member] Term loan. Term Loan Due July 2014 [Member] Term Loan Due July 2014 [Member] Term Loan Due May 2013 [Member] Term Loan Due May 2013 [Member] Term loan. Term Loan TIBOR Due September 2012 [Member] Term Loan TIBOR Due September 2012 [Member] Term Loan TIBOR. Term Loan TIBOR Due July 2011 Member Term Loan Tibor Due July 2011 Member Term Loan TIBOR. Term Loan 90 Day Commercial Paper Due April 2015 [Member] Term loan. Term Loan Bank Sinking Fund Due Mar 2016 [Member] Term Loan Bank Sinking Fund Due Mar 2016 [Member] Secured Equipment and Property Financing [Member] Secured Equipment and Property Financing [Member] Working Capital Facility Due January 2011 [Member] Working capital facility. Working Capital Facility Due January 2012 And April 2012 Member Working capital facility due January 2012 and April 2012. Revolving credit facilities [Member] Line of Credit [Member] $100 million revolving credit facility, LIBOR plus 2.25%-2.75%, due April 2015 [Member] Legal Entity [Axis] Entity [Domain] Subsidiaries [Member] Related Party [Member] Related Party. Debt Instrument [Line Items] Debt Instrument [Line Items] Senior notes Senior Notes Convertible subordinated notes Convertible Subordinated Debt Term Loan for subsidiaries Loans Payable Secured equipment and property financing Secured Debt Borrowing under senior secured credit facility Less: Short-term borrowings and current portion of long-term debt Debt, Current Long-term debt (including related party) Non Current Long term Debt Including Related Party Non current long-term debt including related party. Summary of Short term Borrowings And Long term Debt Schedule of Debt [Table Text Block] Investments Investments and Other Noncurrent Assets [Text Block] Computation of basic and diluted earnings per share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Antidilutive effect of potential shares of common stock that were excluded from diluted earnings per share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Summary of Property, plant and equipment Property, Plant and Equipment [Table Text Block] Reconciliation of property, plant and equipment Schedule Of Property Plant And Equipment Balance Sheet To Cash Flow Reconciliation [Table Text Block] Schedule Of Property Plant And Equipment Balance Sheet To Cash Flow Reconciliation [Table Text Block] Dilutive Securities Adjustments [Table] Dilutive Securities Adjustments [Table] Dilutive Securities Adjustments. Convertible Notes Due 2011 [Member] Convertible Notes Due 2013 [Member] Convertible Notes Due 2014 [Member] Convertible Notes Due 2014 [Member] convertible notes due 2014. Dilutive Securities Adjustments [Line Items] Dilutive Securities Adjustments [Line Items] Dilutive Securities Adjustments. Net income attributable to Amkor Net Income (Loss) Attributable to Parent Income Allocated To Participating Securities Basic Income Allocated To Participating Securities Basic Income allocated to participating securities basic. Net income available to Amkor common stockholders Net Income (Loss) Available to Common Stockholders, Basic Adjustment for dilutive securities on net income: Adjustment For Dilutive Securities On Net Income Abstract Adjustment for dilutive securities on net income. Undistributed Earnings, Basic Undistributed Earnings, Basic Interest on convertible notes due, net of tax Interest on Convertible Debt, Net of Tax Net income attributable to Amkor-diluted Net Income (Loss) Available to Common Stockholders, Diluted Weighted average shares outstanding-basic Weighted Average Number of Shares Outstanding, Basic Effect of dilutive securities: Weighted Average Number Diluted Shares Outstanding Adjustment [Abstract] Stock options Incremental Common Shares Attributable To Stock Options Incremental Common Shares Attributable To Stock options. Unvested restricted shares Incremental Common Shares Attributable To Unvested Restricted Shares Incremental Common Shares Attributable To Unvested restricted shares. Convertible notes due Incremental Common Shares Attributable to Conversion of Debt Securities Weighted average shares outstanding-diluted Weighted Average Number of Shares Outstanding, Diluted Net income attributable to Amkor per common share: Earnings Per Share, Basic and Diluted [Abstract] Basic Earnings Per Share, Basic Diluted Earnings Per Share, Diluted Debt Instrument, Interest Rate, Stated Percentage Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Line of Credit Facility [Table] Line of Credit Facility [Table] Working capital facility Due January 2012 and April 2012 [Member] Working Capital Facility Due January 2013 [Member] Working Capital Facility Due January 2013 [Member] Working Capital Facility Due January 2013. Letter of Credit [Member] ATK Loan [Member] ATK Loan [Member] Secured Debt [Member] Korean Subsidiary [Member] Korean subsidiary member. Chinese Subsidiary [Member] Chinese subsidiary. Taiwan Subsidiaries [Member] Taiwan Subsidiaries [Member] Taiwan subsidiaries. Range [Axis] Range [Domain] Minimum [Member] Maximum [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Credit Facility (Textuals) [Abstract] Credit Facility (Textuals) [Abstract] Credit Facility. Credit facility, interest rate description Secured Term Loan Agreement By Subsidiary Interest Rate Secured term loan agreement by subsidiary interest rate. Line of Credit Facility, Interest Rate Description Line of Credit Facility, Interest Rate Description Interest rate at period end Line of Credit Facility, Interest Rate at Period End Available Letter Of Credit Subfacility Utilized Available Letter Of Credit Subfacility Utilized Available letter of credit sub-facility utilized. Description of borrowing base of revolving credit facility Line of Credit Facility, Collateral Maturity period of working capital facility Line of Credit Facility, Expiration Date Debt Instruments [Abstract] Debt Instrument Term Debt Instrument Term Interest rate on convertible notes due Convertible senior subordinated notes due to related party Due to Related Parties, Noncurrent Debt, interest rate terms Debt Instrument, Interest Rate Terms Loss on extinguishment related to premiums and fees paid for the tender of the 2016 Notes Gains (Losses) on Extinguishment of Debt, before Write off of Deferred Debt Issuance Cost Unamortized deferred debt Unamortized deferred debt Unamortized deferred debt. Additional interest on the notes Debt Instrument Additional Interest Rate Stated Percentage Debt Instrument Additional Interest Rate Stated Percentage. Term loan with Taiwanese Bank due April 2015 and Term Loan with Woori Bank for 12 months Term Loan Arrangement By Subsidiary Term loan arrangement by subsidiary. Principal repayment Debt Instrument, Periodic Payment, Principal Remaining Principal Repayment Remaining Principal Repayment To Be Paid On Maturity Remaining principal repayment to be paid on maturity. Principal Amount of Notes To Be Purchased by Related Party Principal Amount of Notes To Be Purchased by Related Party Principal amount of notes to be purchased by related party. Principal amount of Convertible Subordinated Notes due 2021 owned by Executive Chairman of Board of Directors and largest shareholder Debt Instrument, Face Amount Debt issuance costs incurred in association with 2018 Notes Debt Related Commitment Fees and Debt Issuance Costs Outstanding principal amount of 2016 notes redeemed Debt Tender Offer Principal Amount Debt tender offer principal amount. Charge for write-off of associated unamortized deferred debt issuance costs Write off of Deferred Debt Issuance Cost Interest rate Debt Instrument, Interest Rate at Period End Notes converted into common stock shares Stock Issued During Period, Shares, Conversion of Convertible Securities Penalty Of Additional Interest Will Be Charged For Failure To Effect Exchange Offer Penalty of additional interest will be charged for failure to effect exchange offer. Repayment of senior debt Repayments of Senior Debt Secured Term Loan Secured Term Loan Agreement By Subsidiary Secured term loan agreement by subsidiary. Amount outstanding under the facility Secured Long-term Debt, Noncurrent Debt amount purchased during call Payment For Note Purchased Called For Redemption Payment for note purchased called for redemption. Forfeited Accrued Interest Forfeited Accrued Interest Forfeited accrued interest. Debt Instrument Face Amount Related Party Debt Instrument Face Amount Related Party Debt (Textuals) [Abstract] Debt. Purchase of 2016 Notes Debt Tender Amount Purchased Debt tender amount purchased. Gain or loss as a result of conversion Gain Loss From Conversion Gain or loss as a result of conversion. Unamortized deferred debt cost Unamortized Debt Issuance Expense Schedule of Investments [Table] Investment [Axis] Investment [Domain] One Year from Balance Sheet Date [Member] More than Two and within Three Years from Balance Sheet Date [Member] More than Three and within Four Years from Balance Sheet Date [Member] Schedule of Investments [Line Items] Percentage of ownership held by Existing Holder Percentage Of Ownership Held By Existing Holder Percentage Of Ownership Held By Existing Holder Percentage of ownership held by Company or equity interest Equity Method Investment, Ownership Percentage Percentage of ownership held by Joint Venturer Percentage Of Ownership Held By Joint Venturer Percentage Of Ownership Held By Joint Venturer Equity in earnings of unconsolidated affiliate Income (Loss) from Equity Method Investments Interest income recognized Capital Leases Income Statement Direct Financing Lease Interest Income Capital Leases Income Statement Direct Financing Lease Interest Income Maximum ownership ratio of call options Maximum Ownership Ratio Of Call Options Maximum Ownership Ratio Of Call Options Lease Cancellation Amount Lease Cancellation Amount Lease Cancellation Amount Schedule of Stockholders Equity and Comprehensive Income [Table] Schedule of Stockholders Equity and Comprehensive Income [Table] Schedule of Stockholders Equity and Comprehensive Income [Table] Statement, Equity Components [Axis] Statement, Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Amkor [Member] Parent [Member] Noncontrolling Interest [Member] Noncontrolling Interest [Member] Schedule of Stockholders Equity and Comprehensive Income [Line Items] Schedule of Stockholders Equity and Comprehensive Income [Line Items] Schedule of Stockholders Equity and Comprehensive Income [Line Items] Equity, Beginning balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Comprehensive income: Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] Other comprehensive income: Other Comprehensive Income (Loss), Net of Tax [Abstract] Pension liability adjustment, net of tax Other Comprehensive Income (Loss), Minimum Pension Liability Net Adjustment, Net of Tax Adjustments to unrealized components of defined benefit pension plan, net of tax Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax Cumulative translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Total other comprehensive income Other Comprehensive Income (Loss), Net of Tax Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Treasury stock acquired through surrender of shares for tax withholding Issuance of stock through employee share-based compensation plans Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures Share-based compensation expense Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Repurchase of Common Stock Stock Repurchased During Period, Value Conversion of debt to common stock Stock Issued During Period, Value, Conversion of Convertible Securities, Net of Adjustments Equity, Ending balance Organization, Consolidation and Presentation of Financial Statements [Abstract] Basis of Presentation Basis Of Presentation [Policy Text Block] Basis Of Presentation [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Carrying Value Equity Method Investments Ownership Percentage Property, plant and equipment additions Property, Plant and Equipment, Additions Net change in related accounts payable and deposits Net Change In Related Accounts Payable And Deposits Net Change In Related Accounts Payable And Deposits Purchases of property, plant, and equipment Schedule of Finite-Lived Intangible Assets by Major Class [Table] Schedule of Finite-Lived Intangible Assets by Major Class [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Patents and technology rights [Member] Patents and Technology Rights [Member] Patents and Technology Rights [Member] Customer relationships [Member] Customer Relationships [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets, Net [Abstract] Finite-Lived Intangible Assets, Net [Abstract] Gross Finite-Lived Intangible Assets, Gross Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Net Finite-Lived Intangible Assets, Net Payroll and benefits Accrued Employee Benefits, Current Customer advances and deferred revenue Deferred Revenue and Credits, Current Accrued interest Interest Payable, Current Accrued severance plan obligations (Note 13) Supplemental Unemployment Benefits, Severance Benefits Income taxes payable Accrued Income Taxes, Current Other accrued expenses Total accrued expenses Accrued Liabilities, Current Number of Shares Nonvested beginning balance Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Weighted Average Grant-Date Fair Value Nonvested beginning balance Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Number of Shares Awards granted Weighted Average Grant-Date Fair Value Awards granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Number of Shares Awards vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Weighted Average Grant-Date Fair Value Awards vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Number of Shares Awards forfeited Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Weighted Average Grant-Date Fair Value Awards forfeited Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period, Weighted Average Grant Date Fair Value Number of Shares Nonvested ending balance Weighted Average Grant-Date Fair Value Nonvested ending balance Income Statement [Abstract] Cost of sales Cost of Goods and Services Sold Gross profit Operating expenses: Operating Expenses [Abstract] Selling, general and administrative Selling, General and Administrative Expense Research and development Research and Development Expense Total operating expenses Operating Expenses Operating income Operating Income (Loss) Other expense (income): Nonoperating Income (Expense) [Abstract] Interest expense Interest Expense Interest expense, related party Interest Expense, Related Party Interest income Interest Income, Deposits with Financial Institutions Foreign currency (gain) loss Foreign Currency Transaction Gain (Loss), before Tax Loss on debt retirement, net Gains (Losses) on Extinguishment of Debt Equity in earnings of unconsolidated affiliate Other income, net Other Nonoperating Income (Expense) Total other expense, net Nonoperating Income (Expense) Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Income tax expense Income Tax Expense (Benefit) Net income Net loss (income) attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Net income attributable to Amkor per common share: Shares used in computing per common share amounts: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic Diluted Inventories Inventory Disclosure [Text Block] Pension and Severance Plans Pension And Severance Plans [Text Block] Pension And Severance Plans [Text Block] Employee service share based compensation allocation of recognized period Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] Summary of all common stock option activity Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Assumptions used in valuing the weighted average fair values of the options granted Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Restricted share activity Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Investments Schedule of Equity Method Investments [Table Text Block] Lease receivables Schedule Of Capital Leases In Financial Statements Of Lessor [Table Text Block] Schedule Of Capital Leases In Financial Statements Of Lessor [Table Text Block] Accounting Changes and Error Corrections [Abstract] New Accounting Standards Accounting Changes and Error Corrections [Text Block] Property, Plant And Equipment Property, Plant and Equipment Disclosure [Text Block] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis] Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Report Line [Domain] Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Report Line [Domain] Research and Development [Member] Research and Development Expense [Member] Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Share-based compensation expense Allocated Share-based Compensation Expense, Net of Tax Summarized financial information concerning reportable segments Schedule of Segment Reporting Information, by Segment [Table Text Block] Interim Financial Statements Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Related Party Transactions Disclosure Related Party Transactions Disclosure [Text Block] Fair Value Measurements Fair Value Disclosures [Text Block] Employee Separation Costs [Member] Employee Severance [Member] Contractual Obligations [Member] Contract Termination [Member] Asset Impairments [Member] Impairment in Value of Asset [Member] Restructuring Cost and Reserve [Line Items] Summary of exit activities and reduction in force initiatives Restructuring Reserve [Roll Forward] Accrual, Beginning balance Restructuring Reserve Charges Restructuring Reserve, Period Expense Cash Payments Restructuring Reserve, Settled with Cash Non-cash Amounts Restructuring Reserve, Settled without Cash Accrual, Ending balance 2011 Remaining Future Amortization Expense, Remainder of Fiscal Year 2012 Future Amortization Expense, Year Two 2013 Future Amortization Expense, Year Three 2014 Future Amortization Expense, Year Four 2015 Future Amortization Expense, Year Five Thereafter Future Amortization Expense, after Year Five Total amortization Finite-Lived Intangible Assets, Future Amortization Expense Debt Debt Disclosure [Text Block] Business Segments Segment Reporting Disclosure [Text Block] Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Table] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] U.S. [Member] Domestic Country [Member] Non-U.S. [Member] Foreign Country [Member] J-Devices [Member] J Devices [Member] J Devices [Member] State Income Taxes [Member] State and Local Jurisdiction [Member] Operating Loss Carryforwards [Line Items] Operating Loss Carryforwards [Line Items] Operating loss carryforwards Operating Loss Carryforwards Operating loss carryforwards, expiration dates Operating Loss Carryforwards, Expiration Dates Deferred taxes on investment Deferred Income Tax Expense (Benefit) Deferred taxes on investment on state income taxes Current State and Local Tax Expense (Benefit) Income Taxes (Textuals) [Abstract] Income Taxes Textuals [Abstract] Income Taxes Textuals [Abstract] Income tax expense of foreign operations Foreign Income Tax Expense (Benefit), Continuing Operations Expense related to foreign withholding taxes Expense Related To Foreign Withholding Taxes Expense Related To Foreign Withholding Taxes Gross unrecognized tax benefits Unrecognized Tax Benefits Amount unrecognized tax benefits will decrease by within the next twelve months Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit Settlement of an uncertain position offset Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities Increase in reserve resulting from evaluation Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions ASSETS Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Restricted cash Restricted Cash and Cash Equivalents, Current Accounts receivable: Receivables, Net, Current [Abstract] Trade, net of allowances Accounts Receivable, Net, Current Other Nontrade Receivables, Current Inventories Other current assets Other Assets, Current Total current assets Assets, Current Property, plant and equipment, net Intangibles, net Investments Restricted cash Restricted Cash and Cash Equivalents, Noncurrent Other assets Other Assets, Noncurrent Total assets Assets LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Current liabilities: Liabilities, Current [Abstract] Short-term borrowings and current portion of long-term debt Trade accounts payable Accrued expenses Total current liabilities Liabilities, Current Long-term debt Long-term Debt, Excluding Current Maturities Long-term debt, related party Other non-current liabilities Other Liabilities, Noncurrent Total liabilities Liabilities Commitments and contingencies (see Note 16) Commitments and Contingencies Equity: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Preferred stock, $0.001 par value, 10,000 shares authorized, designated Series A, none issued Preferred Stock, Value, Issued Common stock, $0.001 par value, 500,000 shares authorized, 197,292 and 183,467 shares issued, and 186,256 and 183,420 shares outstanding, in 2011 and 2010, respectively Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Accumulated deficit Retained Earnings (Accumulated Deficit) Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Treasury stock, at cost, 11,036 and 47 shares in 2011 and 2010, respectively Treasury Stock, Value Total Amkor stockholders' equity: Stockholders' Equity Attributable to Parent Noncontrolling interests in subsidiaries Stockholders' Equity Attributable to Noncontrolling Interest Total equity Total liabilities and equity Liabilities and Equity Exit Activities and Reductions in Force Restructuring and Related Activities Disclosure [Text Block] Summary of exit activities and reduction in force initiatives Schedule of Restructuring and Related Costs [Table Text Block] Summary of acquired intangibles Schedule of Finite-Lived Intangible Assets by Major Class [Table Text Block] Estimated future amortization of intangible assets Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]