Total equity Balance at beginning of period Balance at end of period Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 6.625% Senior notes, due September 2027 Senior Notes Due September 2027 [Member] Senior Notes Due September 2027 [Member] Finance lease assets 在累计摊销之前，财务租赁，使用权资产 在累计摊销之前，财务租赁，使用权资产 其他Income and Expense 其他Income and Other Expense Disclosure [Text Block] 土地 土地(成员) Share-based compensation APIC，基于股票的付款安排，成本识别增加 Contract with Customer, Liability, Revenue Recognized Contract with Customer, Liability, Revenue Recognized Total current liabilities 负债，当前 Amortized cost of held-to-maturity securities 债务证券，持有到期 总未识别的税收优惠 Unrecognized Tax Benefits Interest cost 定义的福利计划，利息成本 期限贷款，固定利率为1.80％，到期日至5月2021日 期限贷款5月2021年[会员] 期限贷款到期2021年 Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Treasury stock, shares Balance at beginning of period, shares Balance at end of period, shares 财政部股票，股票 Term loan, fixed rate at 1.35%, due December 2024 Term Loan, Fixed Rate at 1.35% Due December 2024 [Member] Term Loan, Fixed Rate at 1.35% Due December 2024 [Member] 销售成本 销售商品和服务的费用 Net periodic pension cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Current Fiscal Year End Date Current Fiscal Year End Date Type of Restructuring [Domain] Type of Restructuring [Domain] 应付股息，缴纳日期 应付股息，缴纳日期 Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets 净销售额 Revenues 中国 中国 稀释（股票） Weighted-average number of common shares outstanding - diluted Weighted Average Number of Shares Outstanding, Diluted Entity Address, Postal Zip Code Entity Address, Postal Zip Code Carrying Value 报告的价值测量[成员] Summary of Debt Securities Available-for-sale Debt Securities, Available-for-sale [Table Text Block] Term loan, LIBOR plus 2.56%, due December 2023 Term Loan Due December 2023 [Member] Term Loan Due December 2023 [Member] Credit facility, borrowing capacity 信贷额度Facility, Maximum Borrowing Capacity 应付款项和应计[摘要] 应付款项和应计[摘要] Less: Unamortized discount and deferred debt costs, net Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Total property, plant and equipment 在累计折旧和摊销之前，物业，工厂和设备和财务租赁使用权资产 在累计折旧和摊销之前，物业，工厂和设备和财务租赁使用权资产 物业，厂房及设备, net Property, Plant and Equipment, Net LIBOR London Interbank Offered Rate (LIBOR) [Member] 累计其他综合收益（亏损） Total AOCI Attributable to Parent [Member] Basis spread on variable rate (as a percent) 债务仪表，基础传播可变率 Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-sale [Line Items] Total assets 资产 Treasury stock acquired through surrender of shares for tax withholding Share-based Payment Arrangement, Decrease for Tax Withholding Obligation 实体壳牌公司 实体壳牌公司 Cover [Abstract] Cover [Abstract] Document Type Document Type Gross Unrealized Losses Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax Revolving credit facilities and term loans Subsidiary Term Loans and Revolving Credit Facilities [Member] Subsidiary Term Loans and Revolving Credit Facilities [Member] 后续事件 后续事件[Member] 支付长期债务 偿还长期债务 Variable Rate [Domain] Variable Rate [Domain] Term loan, LIBOR plus 1.60%, due March 2022 Term Loan, LIBOR plus 1.60% Due March 2022 [Member] Term Loan, LIBOR plus 1.60% Due March 2022 [Member] Construction in progress 建设正在进行中[会员] 应付所得税 Accrued Income Taxes, Current 汽车，工业等（驾驶员辅助，信息娱乐，性能，安全） 销售渠道，汽车，工业和其他[会员] 销售渠道，汽车，工业和其他[会员] Foreign Plan [Member] Foreign Plan [Member] Retirement Plan Sponsor Location [Domain] Retirement Plan Sponsor Location [Domain] Current liabilities: 负债，目前[摘要] 信用设施[Axis] 信用设施[Axis] 短期融资租赁负债 财务租赁，责任，当前 Pension and severance obligations Liability, Pension and Other Postretirement and Postemployment Benefits, Noncurrent Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] 4.5亿美元的高级安全循环信贷设施，Libor加上1.25％-1.75％，到期2023年7月（新加坡） Senior Secured Revolving Credit Facility due July 2023 [Member] Senior Secured Revolving Credit Facility due July 2023 [Member] Contract with Customer, Sales Channel [Axis] Contract with Customer, Sales Channel [Axis] Repayments of revolving credit facilities Repayments of revolving credit facilities Repayments of Long-term Lines of Credit Term loan, fixed rate at 0.60%, due July 2022 Term Loan, Fixed Rate at 0.60% Due July 2022 [Member] Term Loan, Fixed Rate at 0.60% Due July 2022 [Member] Financial Instrument [Axis] Financial Instrument [Axis] 汇率波动对现金，现金等价物和限制现金的影响 汇率对现金，现金等价物，限制现金及限制现金等价物的影响 Equity [Abstract] Equity [Abstract] 剩余的借贷能力 信贷额度Facility, Remaining Borrowing Capacity Proceeds from short-term debt Proceeds from Short-term Debt 文件季度报告 文件季度报告 承诺和意外情况（注14） Commitments and Contingencies Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] 债务和股权证券，FV-NI [线条物品] 债务和股权证券，FV-NI [线条物品] Non-cash investing and financing activities: Noncash Investing and Financing Items [Abstract] Cash, cash equivalents and restricted cash, beginning of period Cash, cash equivalents and restricted cash, end of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Loss on debt retirement 收益（亏损）灭亡债务 Debt Instrument [Line Items] Debt Instrument [Line Items] 在1年内，公允价值 债务证券，可供出售，成熟，分配和单一成熟日期，一年内，公允价值 Money market funds Money Market Funds [Member] Defined contribution expense Defined Contribution Plan, Cost 未使用的借贷能力 债务文书，未使用的借贷能力，金额 股票期权和限制股票奖项 Stock Options And Restricted Shares [Member] Stock options and restricted shares. Schedule of Restructuring and Related Costs [Table] Schedule of Restructuring and Related Costs [Table] Entity File Number Entity File Number 净收入可归因于邮政股份： 每股收益, Basic and Diluted [Abstract] Capital expenditures payable Capital expenditures payable Amount owed for capital expenditures. 其他financing activities Proceeds from (Payments for) Other Financing Activities 财政股票 财政股票[Member] Document Fiscal Period Focus Document Fiscal Period Focus Financial Instruments [Domain] Financial Instruments [Domain] 通过基于股票的薪酬计划发布 Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture 财政部股票，成本，46,088和46,072股，分别于2020年和2019年 财政股票，价值 重组计划[轴] 重组计划[轴] 先进产品 Advanced Products [Member] Advanced Products [Member] Product and Service [Domain] Product and Service [Domain] Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Effect of dilutive securities: Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract] 商业纸 Commercial Paper [Member] Operating income Operating Income (Loss) Payments for short-term investments Payments to Acquire Short-term Investments Communications (handheld devices, smartphones, tablets) 销售渠道，通信[会员] 销售渠道，通信[会员] Goodwill Goodwill Machinery and equipment Machinery and Equipment [Member] Measurement Frequency [Domain] Measurement Frequency [Domain] Statement [Line Items] Statement [Line Items] 净销售额by product group 与客户合同的收入，不包括评估税 净销售额by product group and end market 收入分解[表格文本块] 其他comprehensive income (loss), net of tax: 其他综合收益（亏损），税收[摘要] 公允价值Disclosures [Abstract] 公允价值Disclosures [Abstract] 期限贷款，固定利率为0.86％，截至6月2022日 Term Loan Due June 2022 [Member] Term Loan Due June 2022 [Member] Revision of Prior Period, Adjustment Restatement Adjustment [Member] Number of held-to-maturity investments held Number of Held-to-Maturity Investments Held Number of Held-to-Maturity Investments Held 基本（每股以美元） 每股收益, Basic 其他 其他非流入收入（费用）, Net 作为其他非流入收入（费用）的组成部分合并的杂项收入和费用项目的净额。 Common Stock, Dividends, Per Share, Declared Common Stock, Dividends, Per Share, Declared Restatement [Domain] Restatement [Domain] 应收应收账款[AXIS] 应收应收账款[AXIS] 应收应收账款[AXIS] 综合收入attributable to Amkor Comprehensive Income (Loss), Net of Tax, Attributable to Parent 后续事件Type [Axis] 后续事件Type [Axis] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Summary of accrued expenses 应计负债的时间表[表格文本块] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] 修正案旗帜 修正案旗帜 After 5 years through 10 Years, Amortized Cost 可供出售债券,到期,所有ocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost Summary of Cash Equivalents and Available-for-Sale Debt Investments 公允价值, Assets Measured on Recurring Basis [Table Text Block] 摊销成本 债务证券，可供出售，摊销费用 Common stock, shares outstanding 普通股，股票，出色 税前收入 Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Shares used in computing per common share amounts: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Level 1 公允价值，投入，1级[会员] 利息花费 Interest Expense Accrued severance plan obligations Postemployment Benefits Liability, Current 累计其他综合收益（亏损） Stockholders' Equity Note Disclosure [Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] 中期财务报表 Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Weighted average interest rate (as a percent) Long-term Debt, Weighted Average Interest Rate, at Point in Time Local Phone Number Local Phone Number 物业，植物和设备[线条物品] 物业，植物和设备[线条物品] TIBOR Tokyo Interbank Offered Rate (TIBOR) [Member] Tokyo Interbank Offered Rate (TIBOR) [Member] 财产，植物和设备和折旧费用摘要 Property, Plant and Equipment [Table Text Block] Accounts receivable, net of allowances Accounts Receivable, after Allowance for Credit Loss, Current Contract with Customer, Sales Channel [Domain] Contract with Customer, Sales Channel [Domain] Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Abstract] 资本的额外支付 Additional Paid in Capital 其他费用,净 Nonoperating Income (Expense) 的应收账款保理(表) 的应收账款保理(表) 的应收账款保理(表) 调整定义福利养老金计划的未实现组成部分 其他Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Total current assets 资产, Current Entity Current Reporting Status Entity Current Reporting Status U.S. government bonds 美国财政证券[会员] Employee Separation Costs 员工遣散[会员] 现金，现金等价物及限制现金净减少 Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Net income attributable to Amkor Net Income (Loss) Attributable to Parent Short-term Investments Short-term Investments [Member] Common Stock Common Stock [Member] Current assets: 资产，当前[摘要] Debt Instrument [Axis] Debt Instrument [Axis] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] 期限贷款，适用的银行利率加2.03％，到期2022年 Term Loan Due September 2022 [Member] Term Loan Due September 2022 [Member] 公允价值, Balance Sheet Grouping, Financial Statement Captions [Line Items] 公允价值, Balance Sheet Grouping, Financial Statement Captions [Line Items] Net income Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Product and Service [Axis] Product and Service [Axis] 实体小企业 实体小企业 Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] 实体文件管理器类别 实体文件管理器类别 其他accrued expenses 其他Accrued Liabilities, Current Accumulated depreciation and amortization 物业，植物和设备和财务租赁使用权资产，累计折旧和摊销 物业，植物和设备和财务租赁使用权资产，累计折旧和摊销 总负债和股权 负债and Equity Entity Address, City or Town Entity Address, City or Town Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Certificate of deposits 存款证书[会员] 建筑物和改进 建筑和建设改进[会员] Total net sales Concentration Risk, Percentage Less: Short-term borrowings and current portion of long-term debt 长期债务，目前的情况 长期经营租赁负债 Operating Lease, Liability, Noncurrent Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Preferred stock designated Series A, shares authorized Preferred Stock, Shares Authorized Restricted cash 限制现金和现金等价物，当前 Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Defined Benefit Pension 累计定义的福利计划调整包括非控制权益的部分[成员] Stockholders’ equity: 股东赋予父母的股权[Abstract] 文件财政年度重点 文件财政年度重点 Proceeds from sale of short-term investments 收益出售债务证券，可供出售 Pension Plans Pension and Other Postretirement Benefits Disclosure [Text Block] 后续事件s 后续事件[文本块] Summary of short-term borrowings and long-term debt 债务时间表[表格文本块] 公允价值, Recurring 公允价值，反复出现[会员] 通过投降税收扣缴股份，股票的财政股票 Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation 常见股票潜在股份概述，不包括每股摊薄收益 Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Proceeds from revolving credit facilities Proceeds from Long-term Lines of Credit 应收账款[Abstract] 应收账款[Abstract] 应收账款[Abstract] 其他(income) expense, net 其他(income) expense, net 其他非流入收入（费用） 定义缴费计划[表] 定义缴费计划[表] 后续事件s [Abstract] Mainstream products 主流产品[会员] 主流产品[会员] Short term investments amortized cost 债务证券，可供出售，摊销成本，当前 公允价值By Balance Sheet Grouping [Table] 公允价值，资产负债表组[表] Accumulated other comprehensive income (loss) 累计其他综合收益（亏损）, Net of Tax Net income attributable to non-controlling interests 占综合收益，可归因于非控股权益 归属于非控制权益的净收入（亏损） 日本合并活动 日本合并活动[Member] 日本合并活动[Member] 地理[轴] 地理[轴] 物业，植物和设备的时间表[表] Property, Plant and Equipment [Table] 留存收益 留存收益[Member] Subsidiary Term Loans 附属学期贷款[会员] 附属学期贷款[会员] 后续事件Type [Domain] 后续事件Type [Domain] 后续事件[Line Items] 后续事件[Line Items] 物业，厂房及设备included in capital expenditures payable Capital Expenditures Incurred but Not yet Paid 文件期限结束日期 文件期限结束日期 Statement [Table] Statement [Table] 其他current assets 其他资产，当前 Entity Registrant Name Entity Registrant Name Payments of Dividends Payments of Dividends Contract with Customer, Liability Contract with Customer, Liability Cash flows from investing activities: （用于）投资活动提供的净现金[摘要] Maximum 最大[成员] Service cost Defined Benefit Plan, Service Cost Valuation of money market funds 公允价值, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block] Proceeds from insurance recovery for property, plant and equipment Proceeds from Insurance Settlement, Investing Activities Unbilled receivables Unbilled Receivables, Current 归属于Amkor普通股权股东的净收入 Net Income (Loss) Available to Common Stockholders, Basic 总公允价值 短期投资政府债券 Debt Securities, Available-for-sale Restricted cash Restricted Cash and Cash Equivalents, Noncurrent Corporate bonds 公司债券证券[会员] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Within 1 year, Amortized Cost 可供出售债券,到期,所有ocated and Single Maturity Date, within One Year, Amortized Cost 现金equivalents 现金等价物[会员] 留存收益 留存收益(Accumulated Deficit) Variable rate demand notes Variable Rate Demand Obligation [Member] Entity Tax Identification Number Entity Tax Identification Number 面临债务金额 债务工具，面部金额 稀释（每股美元） 每股收益，稀释 Components of net periodic pension cost Schedule of Net Benefit Costs [Table Text Block] Changes in assets and liabilities Increase (Decrease) in Operating Capital Short-term borrowings and current portion of long-term debt Debt, Current 交易符号 交易符号 Minimum Minimum [Member] 子公司的不控制权益 股东赋予不可逆信利息的股权 抵押贷款支持证券 抵押贷款支持证券[Member] 投资，债务和股权证券[摘要] 投资，债务和股权证券[摘要] 外币翻译 其他Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Restructuring Type [Axis] Restructuring Type [Axis] Term loan, applicable bank rate plus 2.03%, due July 2022 期限贷款到期7月2022年[会员] 期限贷款到期7月2022年[会员] Statistical Measurement [Domain] Statistical Measurement [Domain] Retirement Plan Sponsor Location [Axis] Retirement Plan Sponsor Location [Axis] Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Income tax expense Income tax expense 所得税费用（福利） 从累积的其他综合收益（亏损）重新分类金额 Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] 其他非流动负债 其他负债, Noncurrent 基金浮动率 基金浮动率[Member] 基金浮动率[Member] City Area Code City Area Code 重组储备，翻译和其他调整 重组储备，翻译和其他调整 Title of 12(b) Security Title of 12(b) Security Foreign Currency Translation Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member] 其他投资活动 Payments for (Proceeds from) Other Investing Activities Foreign currency (gain) loss, net 外币交易收益（亏损），税前 公允价值 公允价值计量估计[成员] 净收入可归因于邮政股份： 每股收益[摘要] 每股收益[摘要] Taiwan TAIWAN, PROVINCE OF CHINA Asset-backed securities Asset-backed Securities [Member] 公允价值Hierarchy and NAV [Axis] 公允价值Hierarchy and NAV [Axis] 非控制权益的子公司股息 Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders 其他经营活动和非现金项目 其他Noncash Income (Expense) Unrealized Gains (Losses) on Short-term Investments AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] 新加坡 SINGAPORE Debt Long-term Debt, Gross Furniture, fixtures and other equipment Furniture and Fixtures [Member] ASSETS 资产[摘要] Gross Unrealized Gains Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Preferred stock designated Series A, par value (in dollars per share) 每股股票或规定的价值 累计其他综合收益（亏损）[Table] 累计其他综合收益（亏损）[Table] Changes in accumulated other comprehensive income (loss), net of tax 累积其他综合收益的时间表（亏损）[表文本块] 经营活动中的现金流量： （用于）经营活动提供的净现金[摘要] Investments 投资债务和可销售股权证券（及某些交易资产）披露[文本块] Total operating expenses Operating Expenses Term Loan, LIBOR plus 1.40% due March 2022 Term Loan, LIBOR plus 1.40% Due March 2022 [Member] Term Loan, LIBOR plus 1.40% Due March 2022 [Member] After 1 year through 5 years, Fair Value 可供出售债券,到期,所有ocated and Single Maturity Date, after One Through Five Years, Fair Value Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Measurement Basis [Axis] Measurement Basis [Axis] 重组和相关活动[摘要] 重组和相关活动[摘要] 其他重组[会员] 其他重组[会员] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Restructuring and Other Exit Activities Restructuring and Related Activities Disclosure [Text Block] 债务证券，贸易和股权证券，FV-NI [表] 债务证券，贸易和股权证券，FV-NI [表] Schedule of Cash and Cash Equivalents Schedule of Cash and Cash Equivalents [Table Text Block] 股东权益中增加（减少）[向前滚动] 股东权益中增加（减少）[向前滚动] Computing (data center, infrastructure, PC/laptop, storage) Sales Channel, Computing [Member] Sales Channel, Computing [Member] Statistical Measurement [Axis] Statistical Measurement [Axis] Fair market value of held-to-maturity securities 债务证券，持有到期, Fair Value 累计其他综合收益（亏损）[Line Items] 累计其他综合收益（亏损）[Line Items] Estimated additional charges to be incurred 重组和相关成本，预期成本剩余 介绍的基础 会计基础，政策[政策文本块] 财务状况陈述[摘要] 财务状况陈述[摘要] Accrual, beginning balance Accrual, ending balance Restructuring Reserve Defined Contribution Plan Disclosure [Line Items] Defined Contribution Plan Disclosure [Line Items] Debt Debt Disclosure [Text Block] Total cumulative charges incurred to date Restructuring and Related Cost, Cost Incurred to Date Common stock, shares authorized 普通股，股票授权 期限贷款，资金浮动率加上1.60％，到期2020年6月 Term Loan Due June 2020 [Member] 期限贷款2020年6月[成员] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Interest income Interest Income, Deposits with Financial Institutions 实体中央索引密钥 实体中央索引密钥 实体新兴成长公司 实体新兴成长公司 非抵御子公司的兴趣 Noncontrolling Interest [Member] 销售，一般和行政 Selling, General and Administrative Expense Senior Notes 高级票据 Senior Notes [Member] Short-term operating lease liabilities Operating Lease, Liability, Current Computation of basic and diluted earnings per share 每股收益的时间表，基本和稀释[表格文本块] Long-term debt Long-term debt Long-term Debt, Excluding Current Maturities Income Taxes Income Tax, Policy [Policy Text Block] 信用设施[域名] 信用设施[域名] Payroll and benefits 员工相关的负债，当前 Level 2 公允价值，投入，2级[会员] Income Taxes Income Tax Disclosure [Text Block] 支付养老金和其他PostretiveMent福利 支付养老金和其他PostretiveMent福利 Dividends Payable, Date of Record Dividends Payable, Date of Record 止血证券排除在每股收益的计算中，通过止血证券[轴] Antidilutive Securities [Axis] Term loan, applicable bank rate plus 1.77%, due April 2023 Term Loan Due April 2023 [Member] Term Loan Due April 2023 浓度风险类型[轴] 浓度风险类型[轴] Preferred stock designated Series A, shares issued Preferred Stock, Shares Issued Revenue from Contract with Customer 与客户基准合同的收入[会员] U.S. government agency bonds US Government Agencies Debt Securities [Member] LIABILITIES AND EQUITY 负债和股权[摘要] Software and computer equipment 软件和计算机设备[会员] 软件和计算机设备[会员] 通过基于股票的薪酬计划发布, shares 已发行，股票，基于股票的付款安排，未经用 其他assets 其他资产, Noncurrent 对可用销售债务投资的净未实现收益（亏损）的调整 其他综合收益（亏损），可供销售证券调整，税收税，部分归属于父母 来自融资活动的现金流量： Net Cash Provided by (Used in) Financing Activities [Abstract] Total other comprehensive income (loss) 其他comprehensive income (loss) 其他Comprehensive Income (Loss), Net of Tax 经过10年后，公允价值 可供出售债券,到期,所有ocated and Single Maturity Date, after Five Through Ten Years, Fair Value Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Long-term Debt Long-term Debt 公允价值Hierarchy and NAV [Domain] 公允价值Hierarchy and NAV [Domain] Payments for property, plant and equipment Payments to Acquire Property, Plant, and Equipment Proceeds from issuance of long-term debt Proceeds from Issuance of Long-term Debt 应计利息 Interest Payable, Current End Market Distribution Channel Concentration Risk [Member] Distribution Channel Concentration Risk [Member] 后续事件[Table] 后续事件[Table] 折扣和费用 Factoring Fees [Member] Factoring Fees [Member] 剧本股东总权益 Parent [Member] Additional Paid- In Capital 额外的支付资本[会员] Net Sales by Product Group and End Market Revenue from Contract with Customer [Text Block] Proceeds from issuance of long-term debt Proceeds from Issuance of Other Long-term Debt 公允价值Measurement [Domain] 公允价值Measurement [Domain] 注明利率（百分比） Debt Instrument, Interest Rate, Stated Percentage Entity Address, Address Line One Entity Address, Address Line One Applicable Bank Rate 适用的银行利率[会员] 适用的银行利率[会员] Municipal bonds Municipal Bonds [Member] 物业，厂房及设备 Property, Plant and Equipment, Gross Gross profit Gross Profit Geographical [Domain] Geographical [Domain] Property, Plant And Equipment Property, Plant and Equipment Disclosure [Text Block] Entity Address, State or Province Entity Address, State or Province Charges Restructuring Charges 其他收入和费用[摘要] 其他收入和费用[摘要] Weighted Average Weighted Average [Member] 退休福利[摘要] 退休福利[摘要] Net cash used in investing activities （用于）投资活动提供的净现金 Facility and Other Exit Costs Facility Closing [Member] Proceeds from sale of property, plant and equipment Proceeds from Sale of Property, Plant, and Equipment 应付贸易账款 应付账款，当前 Payments of short-term debt Repayments of Short-term Debt 转换定义遣散计划的义务benefit liability 转换定义遣散计划的义务contribution liability 转换定义遣散计划的义务contribution liability 其他comprehensive income (loss) before reclassifications 其他Comprehensive Income (Loss), before Reclassifications, Net of Tax $30 million revolving credit facility, LIBOR plus the applicable bank rate Credit Facility, LIBOR plus bank rate [Member] Credit Facility, LIBOR plus bank rate Accrued expenses 总收费的费用 Accrued Liabilities, Current Korea KOREA, REPUBLIC OF Total Factored Total Factored [Member] 应收账款总应收委员会[会员] Entity Interactive Data Current Entity Interactive Data Current Commitments and Contingencies Commitments and Contingencies, Policy [Policy Text Block] Common stock, shares issued Balance at beginning of period, shares Balance at end of period, shares Common Stock, Shares, Issued Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Total Cash and Cash Equivalents and Debt Securities, Available-for-sale, Fair Value Disclosure Cash and Cash Equivalents and Debt Securities, Available-for-sale, Fair Value Disclosure Cash Payments Payments for Restructuring Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Total debt 债务工具，公允价值披露 Inventories Inventory, Net Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Consumer (connected home, set-top boxes, televisions, visual imaging, wearables) Sales Channel, Consumer Goods [Member] Sales Channel, Consumer Goods[Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Summary of Exit Activities 成本类型的重组储备时间表[表格文本块] 每股收益 每股收益[Text Block] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] 一期贷款，于2020年4月进入 Term Loan Entered in April 2020 [Member] Term Loan Entered in April 2020 [Member] Japan JAPAN Revolving Credit Facility Revolving Credit Facility [Member] Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-sale [Table] 对收入的分解[表] 对收入的分解[表] Revolving credit facility, TAIFX plus the applicable bank rate, due December 2024 (Taiwan) Revolving Credit Facility due December 2024 [Member] Revolving Credit Facility due December 2024 [Member] Term loan, fixed rate at 1.30%, due July 2023 Term Loan, Fixed Rate at 1.30% Due July 2023 [Member] Term Loan, Fixed Rate at 1.30% Due July 2023 [Member] 负债总额 负债 应收账款[Domain] 应收账款[Domain] [Domain] for Factoring of Accounts Receivable [Axis] Restatement [Axis] Restatement [Axis] Reclassifications Reclassification, Policy [Policy Text Block] 常见的股票，0.001美元，500,000股股票授权;发行288,043和286,877股;和241,955和240,805股分别在2020年和2019年突出 Common Stock, Value, Issued 短期投资的情况收益 Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale Accrued Expenses Accounts Payable and Accrued Liabilities Disclosure [Text Block] Research and development 研究和开发费用 Restructuring Reserve [Roll Forward] Restructuring Reserve [Roll Forward] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] 现金及现金等价物 Cash and Cash Equivalents, at Carrying Value 股票期权和限制股票奖项(in shares) 归属于基于股份支付安排的稀释效应的增量普通股 支付长期债务 Repayments of Other Long-term Debt Accounts receivable sold Accounts Receivable Sold without Recourse Accounts Receivable Sold without Recourse 循环信贷设施3000万美元，适用银行利率加上1.51％ 信贷设施，适用银行利率加上1.51％[Member] 信贷设施，适用银行利率加上1.51％ Basic (in shares) Weighted-average number of common shares outstanding - basic Weighted Average Number of Shares Outstanding, Basic Operating lease right of use assets Operating Lease, Right-of-Use Asset 其他收入和费用的时间表 Schedule of Other Nonoperating Income (Expense) [Table Text Block] 声明，权益组件[AXIS] Equity Components [Axis] Equity Components [Axis] Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] 金融工具的公允价值在经常性基础上以公允价值记录 Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] Total Amkor stockholders’ equity 股东赋予父母的股权 Concentration Risk Type [Domain] Concentration Risk Type [Domain] Deferred revenue and customer advances Contract with Customer, Liability, Current Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] 公允价值Measurements 公允价值披露[文本块] 期末（百分比）的利率 信贷额度Facility, Interest Rate at Period End Depreciation and amortization 折旧，耗尽和摊销 Goodwill Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Preferred stock, $0.001 par value, 10,000 shares authorized, designated Series A, none issued Preferred Stock, Value, Issued Variable Rate [Axis] Variable Rate [Axis] 现金equivalents 现金equivalent money market funds Cash and Cash Equivalents, Fair Value Disclosure 安全交换名称 安全交换名称 股票期权和限制股票奖项 免疫证券排除在每股收益的计算中，金额 折旧费用 Depreciation 长期债务，型[轴] 长期债务，型[轴] 综合收入 综合收益(损失),净税收,包括Portion Attributable to Noncontrolling Interest 经营活动提供的净现金 Net Cash Provided by (Used in) Operating Activities 股权分量[域] 股权分量[域] Total property, plant and equipment, net Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Short-term term loans, variable rate Short term term loan, variable rate [Member] Short term term loan, variable rate [Member] Document Transition Report Document Transition Report Short-term investments (amortized cost of $355,939 in 2020) Short-term Investments Payments of finance lease obligations Finance Lease, Principal Payments 信贷额度 信贷额度[Member] After 1 year through 5 years, Amortized Cost 可供出售债券,到期,所有ocated and Single Maturity Date, after One Through Five Years, Amortized Cost 认可的精算增益 界定福利计划，福利义务，精算股（亏损） 应收账款[Line Items] 应收账款[Line Items] [Line Items] for Factoring of Accounts Receivable [Table] 定义缴费费用摘要 Defined Contribution Plan Disclosures [Table Text Block] 应付股息，日期宣布 应付股息，日期宣布 损益表[摘要] 损益表[摘要] Restructuring Plan [Domain] Restructuring Plan [Domain] 应收账款 应收应收账款[文本块] 应收账款 AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] Term loan, applicable bank rate plus 1.98%, due December 2028 期限贷款到期2028年12月[会员] 期限贷款到期2028年12月[会员]