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Additional Information (Detail) Details 104 false false R105.htm 101080 - Disclosure - Litigation - Schedule of Loss Contingencies by Contingency (Detail) Sheet http://ampcopgh.com/20231231/taxonomy/role/Role_DisclosureLitigationScheduleOfLossContingenciesByContingencyDetail Litigation - Schedule of Loss Contingencies by Contingency (Detail) Details 105 false false R106.htm 101090 - Disclosure - Litigation - Schedule of Loss Contingencies by Contingency (Parenthetical) (Detail) Sheet http://ampcopgh.com/20231231/taxonomy/role/Role_DisclosureLitigationScheduleOfLossContingenciesByContingencyParentheticalDetail Litigation - Schedule of Loss Contingencies by Contingency (Parenthetical) (Detail) Details 106 false false R107.htm 101100 - Disclosure - Litigation - Additional Information (Detail) Sheet http://ampcopgh.com/20231231/taxonomy/role/Role_DisclosureLitigationAdditionalInformationDetail Litigation - Additional Information (Detail) Details 107 false false R108.htm 101110 - Disclosure - Litigation - Summary of Activity Relating to Asbestos Liability (Details) Sheet http://ampcopgh.com/20231231/taxonomy/role/DisclosureLitigationSummaryOfActivityRelatingToAsbestosLiabilityDetails Litigation - Summary of Activity Relating to Asbestos Liability (Details) Details 108 false false R109.htm 101120 - Disclosure - Litigation - Summary of Activity in Asbestos Insurance Recoveries (Detail) Sheet http://ampcopgh.com/20231231/taxonomy/role/Role_DisclosureLitigationSummaryOfActivityInAsbestosInsuranceRecoveriesDetail Litigation - Summary of Activity in Asbestos Insurance Recoveries (Detail) Details 109 false false R110.htm 101130 - Disclosure - Litigation - Summary of Asbestos Related Costs (Detail) Sheet http://ampcopgh.com/20231231/taxonomy/role/DisclosureLitigationSummaryOfAsbestosRelatedCostsDetail Litigation - Summary of Asbestos Related Costs (Detail) Details 110 false false R111.htm 101140 - Disclosure - Income Taxes - (Loss) Income from Operations Before Income Taxes (Detail) Sheet http://ampcopgh.com/20231231/taxonomy/role/DisclosureIncomeTaxesLossIncomeFromOperationsBeforeIncomeTaxesDetail Income Taxes - (Loss) Income from Operations Before Income Taxes (Detail) Details http://ampcopgh.com/20231231/taxonomy/role/Role_DisclosureIncomeTaxesTables 111 false false R112.htm 101150 - Disclosure - Income Taxes - Summary of Income Tax Provision (Detail) Sheet http://ampcopgh.com/20231231/taxonomy/role/DisclosureIncomeTaxesSummaryOfIncomeTaxProvisionDetail Income Taxes - Summary of Income Tax Provision (Detail) Details 112 false false R113.htm 101160 - Disclosure - Income Taxes - Additional Information (Detail) Sheet http://ampcopgh.com/20231231/taxonomy/role/Role_DisclosureIncomeTaxesAdditionalInformationDetail Income Taxes - Additional Information (Detail) Details 113 false false R114.htm 101170 - Disclosure - Income Taxes - Difference Between Statutory U.S. Federal Income Tax and the Corporation's Effective Income Tax (Detail) Sheet http://ampcopgh.com/20231231/taxonomy/role/Role_DisclosureIncomeTaxesDifferenceBetweenStatutoryUSFederalIncomeTaxAndCorporationSEffectiveIncomeTaxDetail Income Taxes - Difference Between Statutory U.S. Federal Income Tax and the Corporation's Effective Income Tax (Detail) Details 114 false false R115.htm 101180 - Disclosure - Income Taxes - Deferred Income Tax Assets and Liabilities (Detail) Sheet http://ampcopgh.com/20231231/taxonomy/role/Role_DisclosureIncomeTaxesDeferredIncomeTaxAssetsAndLiabilitiesDetail Income Taxes - Deferred Income Tax Assets and Liabilities (Detail) Details 115 false false R116.htm 101190 - Disclosure - Environmental Matters - Additional Information (Detail) Sheet http://ampcopgh.com/20231231/taxonomy/role/Role_DisclosureEnvironmentalMattersAdditionalInformationDetail Environmental Matters - Additional Information (Detail) Details 116 false false R117.htm 101200 - Disclosure - Related Parties - Additional Information (Detail) Sheet http://ampcopgh.com/20231231/taxonomy/role/Role_DisclosureRelatedPartiesAdditionalInformationDetail Related Parties - Additional Information (Detail) Details 117 false false R118.htm 101210 - Disclosure - Related Parties - Summary of Loan Activity (Detail) Sheet http://ampcopgh.com/20231231/taxonomy/role/DisclosureRelatedPartiesSummaryOfLoanActivityDetail Related Parties - Summary of Loan Activity (Detail) Details 118 false false R119.htm 101220 - Disclosure - Related Parties - Summary of Sales to and Purchases from ATR's Minority Shareholder and Its Affiliates (Detail) Sheet http://ampcopgh.com/20231231/taxonomy/role/DisclosureRelatedPartiesSummaryOfSalesToAndPurchasesFromAtrsMinorityShareholderAndItsAffiliatesDetail Related Parties - Summary of Sales to and Purchases from ATR's Minority Shareholder and Its Affiliates (Detail) Details 119 false false R120.htm 101230 - Disclosure - Related Parties - Summary of Balances Outstanding with ATR's Minority Shareholder and Its Affiliates (Detail) Sheet http://ampcopgh.com/20231231/taxonomy/role/DisclosureRelatedPartiesSummaryOfBalancesOutstandingWithAtrsMinorityShareholderAndItsAffiliatesDetail Related Parties - Summary of Balances Outstanding with ATR's Minority Shareholder and Its Affiliates (Detail) Details 120 false false R121.htm 101240 - Disclosure - Business Segments - Additional Information (Detail) Sheet http://ampcopgh.com/20231231/taxonomy/role/Role_DisclosureBusinessSegmentsAdditionalInformationDetail Business Segments - Additional Information (Detail) Details 121 false false R122.htm 101250 - Disclosure - Business Segments - Business Segment Net Sales and (Loss) Income from Operations Before Income Taxes (Detail) Sheet http://ampcopgh.com/20231231/taxonomy/role/Role_DisclosureBusinessSegmentsBusinessSegmentNetSalesAndLossIncomeFromOperationsBeforeIncomeTaxesDetail Business Segments - Business Segment Net Sales and (Loss) Income from Operations Before Income Taxes (Detail) Details 122 false false R123.htm 101260 - Disclosure - Business Segments - Business Segment Net Sales and (Loss) Income from Operations Before Income Taxes (Parenthetical) (Detail) Sheet http://ampcopgh.com/20231231/taxonomy/role/Role_DisclosureBusinessSegmentsBusinessSegmentNetSalesAndLossIncomeFromOperationsBeforeIncomeTaxesParentheticalDetail Business Segments - Business Segment Net Sales and (Loss) Income from Operations Before Income Taxes (Parenthetical) (Detail) Details 123 false false All Reports Book All Reports [ix-0514-Hidden-Fact-Eligible-For-Transform] WARN: 6 fact(s) appearing in ix:hidden were eligible for transformation: ap:AdministrativeClosuresClaimsPeriod, ap:DebtInstrumentInterestAccrualPeriod, ap:DebtInstrumentInterestPeriod, ap:NumberOfDefinedBenefitPensionPlans - ap-20231231.htm 8 [DQC.US.0070.7645] The concept DefinedBenefitPlanFairValueOfPlanAssets with a defaulted value of 163929000.000000 is not equal to the aggregated value of the dimensionally qualified components on the axis DefinedBenefitPlanByPlanAssetCategoriesAxis which has an aggregate value of 327858000.000000 based on the data in the filing. The aggregated value is calculated by adding the members in the network http://ampcopgh.com/20231231/taxonomy/role/Role_DisclosurePensionAndOtherPostretirementBenefitsAssetCategoriesBasedOnNatureAndRisksOfPlanAssetsDetail. The values of the calculation components are as follows: 209000, 306000, 84980000, 3394000, 791000, 401000, 51729000, 1848000, 114000, 23456000, 456000, 3491000, 32482000, 6993000, 437000, 7825000, 5117000, 64000, 6035000, 67157000, 5757000, 211000, 6035000, 5757000, 5907000, 1674000, 573000, 4659000. The value of a concept broken down by its components along the DefinedBenefitPlanByPlanAssetCategoriesAxis axis should be equal to its component pieces. An error could occur for one of the following reasons: 1. The values of the plan assets by category have been further disaggregated by additional dimensions such as geography. Plan Asset categories should not be dimensionally disaggregated and members should be defined for each security class reported. i.e. Equity Securities in the US should be represented as a single member. 2. The default value of DefinedBenefitPlanFairValueOfPlanAssets is incorrectly totaled for DefinedBenefitPlanFairValueOfPlanAssets 3. Not all dimension members or additional dimensions have been defined on the category axis DefinedBenefitPlanByPlanAssetCategoriesAxis. 4. The filer has reported a sub component of plan assets that does not represent a complete breakdown of the total. In these cases the element DefinedBenefitPlanPlanAssetsInvestmentWithinPlanAssetCategoryAmount should be used instead of the element DefinedBenefitPlanFairValueOfPlanAssets. This rule aggregates the value of member components located on the axis at the highest level of aggregation to avoid double counting in the event that the company uses a hierarchy of members. The properties of this DefinedBenefitPlanFairValueOfPlanAssets fact are: Context: C_3837b1b7-2b58-4d32-bfff-2f6901fff967 Unit: U_USD. - ap-20231231.htm 11593 - ap-20231231.htm 11593 [DQC.US.0070.7645] The concept DefinedBenefitPlanFairValueOfPlanAssets with a defaulted value of 109544000.000000 is not equal to the aggregated value of the dimensionally qualified components on the axis DefinedBenefitPlanByPlanAssetCategoriesAxis which has an aggregate value of 219088000.000000 based on the data in the filing. The aggregated value is calculated by adding the members in the network http://ampcopgh.com/20231231/taxonomy/role/Role_DisclosurePensionAndOtherPostretirementBenefitsAssetCategoriesBasedOnNatureAndRisksOfPlanAssetsDetail. The values of the calculation components are as follows: 5967000, 646000, 1183000, 3165000, 279000, 438000, 0, 4138000, 2697000, 1112000, 43408000, 4138000, 463000, 0, 32409000, 2454000, 123000, 369000, 6162000, 450000, 5631000, 66000, 4222000, 72997000, 26247000, 324000. The value of a concept broken down by its components along the DefinedBenefitPlanByPlanAssetCategoriesAxis axis should be equal to its component pieces. An error could occur for one of the following reasons: 1. The values of the plan assets by category have been further disaggregated by additional dimensions such as geography. Plan Asset categories should not be dimensionally disaggregated and members should be defined for each security class reported. i.e. Equity Securities in the US should be represented as a single member. 2. The default value of DefinedBenefitPlanFairValueOfPlanAssets is incorrectly totaled for DefinedBenefitPlanFairValueOfPlanAssets 3. Not all dimension members or additional dimensions have been defined on the category axis DefinedBenefitPlanByPlanAssetCategoriesAxis. 4. The filer has reported a sub component of plan assets that does not represent a complete breakdown of the total. In these cases the element DefinedBenefitPlanPlanAssetsInvestmentWithinPlanAssetCategoryAmount should be used instead of the element DefinedBenefitPlanFairValueOfPlanAssets. This rule aggregates the value of member components located on the axis at the highest level of aggregation to avoid double counting in the event that the company uses a hierarchy of members. The properties of this DefinedBenefitPlanFairValueOfPlanAssets fact are: Context: C_2572680f-4577-4396-b258-54692f5a7b08 Unit: U_USD. - ap-20231231.htm 11593 - ap-20231231.htm 11593 [DQC.US.0070.7645] The concept DefinedBenefitPlanFairValueOfPlanAssets with a defaulted value of 5714000.000000 is not equal to the aggregated value of the dimensionally qualified components on the axis DefinedBenefitPlanByPlanAssetCategoriesAxis which has an aggregate value of 11428000.000000 based on the data in the filing. The aggregated value is calculated by adding the members in the network http://ampcopgh.com/20231231/taxonomy/role/Role_DisclosurePensionAndOtherPostretirementBenefitsAssetCategoriesBasedOnNatureAndRisksOfPlanAssetsDetail. The values of the calculation components are as follows: 0, 0, 5714000, 0, 0, 5714000. The value of a concept broken down by its components along the DefinedBenefitPlanByPlanAssetCategoriesAxis axis should be equal to its component pieces. An error could occur for one of the following reasons: 1. The values of the plan assets by category have been further disaggregated by additional dimensions such as geography. Plan Asset categories should not be dimensionally disaggregated and members should be defined for each security class reported. i.e. Equity Securities in the US should be represented as a single member. 2. The default value of DefinedBenefitPlanFairValueOfPlanAssets is incorrectly totaled for DefinedBenefitPlanFairValueOfPlanAssets 3. Not all dimension members or additional dimensions have been defined on the category axis DefinedBenefitPlanByPlanAssetCategoriesAxis. 4. The filer has reported a sub component of plan assets that does not represent a complete breakdown of the total. In these cases the element DefinedBenefitPlanPlanAssetsInvestmentWithinPlanAssetCategoryAmount should be used instead of the element DefinedBenefitPlanFairValueOfPlanAssets. This rule aggregates the value of member components located on the axis at the highest level of aggregation to avoid double counting in the event that the company uses a hierarchy of members. The properties of this DefinedBenefitPlanFairValueOfPlanAssets fact are: Context: C_9990526a-4376-413e-acac-507d51ed9001 Unit: U_USD. - ap-20231231.htm 11593 - ap-20231231.htm 11593 [DQC.US.0070.7645] The concept DefinedBenefitPlanFairValueOfPlanAssets with a defaulted value of 122339000.000000 is not equal to the aggregated value of the dimensionally qualified components on the axis DefinedBenefitPlanByPlanAssetCategoriesAxis which has an aggregate value of 221222000.000000 based on the data in the filing. The aggregated value is calculated by adding the members in the network http://ampcopgh.com/20231231/taxonomy/role/Role_DisclosurePensionAndOtherPostretirementBenefitsAssetCategoriesBasedOnNatureAndRisksOfPlanAssetsDetail. The values of the calculation components are as follows: 4659000, 209000, 306000, 791000, 51729000, 401000, 5757000, 321000, 1848000, 5757000, 456000, 321000, 31281000, 114000, 573000, 437000, 6993000, 7825000, 64000, 5117000, 211000, 84980000, 3491000, 5907000, 1674000. The value of a concept broken down by its components along the DefinedBenefitPlanByPlanAssetCategoriesAxis axis should be equal to its component pieces. An error could occur for one of the following reasons: 1. The values of the plan assets by category have been further disaggregated by additional dimensions such as geography. Plan Asset categories should not be dimensionally disaggregated and members should be defined for each security class reported. i.e. Equity Securities in the US should be represented as a single member. 2. The default value of DefinedBenefitPlanFairValueOfPlanAssets is incorrectly totaled for DefinedBenefitPlanFairValueOfPlanAssets 3. Not all dimension members or additional dimensions have been defined on the category axis DefinedBenefitPlanByPlanAssetCategoriesAxis. 4. The filer has reported a sub component of plan assets that does not represent a complete breakdown of the total. In these cases the element DefinedBenefitPlanPlanAssetsInvestmentWithinPlanAssetCategoryAmount should be used instead of the element DefinedBenefitPlanFairValueOfPlanAssets. This rule aggregates the value of member components located on the axis at the highest level of aggregation to avoid double counting in the event that the company uses a hierarchy of members. The properties of this DefinedBenefitPlanFairValueOfPlanAssets fact are: Context: C_becd04ef-7e58-4b53-959d-a206c67b0558 Unit: U_USD. - ap-20231231.htm 11593 - ap-20231231.htm 11593 [DQC.US.0070.7645] The concept DefinedBenefitPlanFairValueOfPlanAssets with a defaulted value of 161374000.000000 is not equal to the aggregated value of the dimensionally qualified components on the axis DefinedBenefitPlanByPlanAssetCategoriesAxis which has an aggregate value of 322748000.000000 based on the data in the filing. The aggregated value is calculated by adding the members in the network http://ampcopgh.com/20231231/taxonomy/role/Role_DisclosurePensionAndOtherPostretirementBenefitsAssetCategoriesBasedOnNatureAndRisksOfPlanAssetsDetail. The values of the calculation components are as follows: 5983000, 3165000, 279000, 438000, 72997000, 1112000, 463000, 43408000, 231000, 2454000, 123000, 369000, 6162000, 2697000, 5631000, 450000, 39047000, 77670000, 6569000, 4138000, 6569000, 4138000, 4222000, 66000, 26247000, 1183000, 324000, 5967000, 646000. The value of a concept broken down by its components along the DefinedBenefitPlanByPlanAssetCategoriesAxis axis should be equal to its component pieces. An error could occur for one of the following reasons: 1. The values of the plan assets by category have been further disaggregated by additional dimensions such as geography. Plan Asset categories should not be dimensionally disaggregated and members should be defined for each security class reported. i.e. Equity Securities in the US should be represented as a single member. 2. The default value of DefinedBenefitPlanFairValueOfPlanAssets is incorrectly totaled for DefinedBenefitPlanFairValueOfPlanAssets 3. Not all dimension members or additional dimensions have been defined on the category axis DefinedBenefitPlanByPlanAssetCategoriesAxis. 4. The filer has reported a sub component of plan assets that does not represent a complete breakdown of the total. In these cases the element DefinedBenefitPlanPlanAssetsInvestmentWithinPlanAssetCategoryAmount should be used instead of the element DefinedBenefitPlanFairValueOfPlanAssets. This rule aggregates the value of member components located on the axis at the highest level of aggregation to avoid double counting in the event that the company uses a hierarchy of members. The properties of this DefinedBenefitPlanFairValueOfPlanAssets fact are: Context: C_96ca51a6-43b8-4129-9f0f-79d33f9e5a8b Unit: U_USD. - ap-20231231.htm 11593 - ap-20231231.htm 11593 [DQC.US.0070.7645] The concept DefinedBenefitPlanFairValueOfPlanAssets with a defaulted value of 45261000.000000 is not equal to the aggregated value of the dimensionally qualified components on the axis DefinedBenefitPlanByPlanAssetCategoriesAxis which has an aggregate value of 90522000.000000 based on the data in the filing. The aggregated value is calculated by adding the members in the network http://ampcopgh.com/20231231/taxonomy/role/Role_DisclosurePensionAndOtherPostretirementBenefitsAssetCategoriesBasedOnNatureAndRisksOfPlanAssetsDetail. The values of the calculation components are as follows: 0, 0, 39047000, 45261000, 0, 0, 5983000, 231000, 0. The value of a concept broken down by its components along the DefinedBenefitPlanByPlanAssetCategoriesAxis axis should be equal to its component pieces. An error could occur for one of the following reasons: 1. The values of the plan assets by category have been further disaggregated by additional dimensions such as geography. Plan Asset categories should not be dimensionally disaggregated and members should be defined for each security class reported. i.e. Equity Securities in the US should be represented as a single member. 2. The default value of DefinedBenefitPlanFairValueOfPlanAssets is incorrectly totaled for DefinedBenefitPlanFairValueOfPlanAssets 3. Not all dimension members or additional dimensions have been defined on the category axis DefinedBenefitPlanByPlanAssetCategoriesAxis. 4. The filer has reported a sub component of plan assets that does not represent a complete breakdown of the total. In these cases the element DefinedBenefitPlanPlanAssetsInvestmentWithinPlanAssetCategoryAmount should be used instead of the element DefinedBenefitPlanFairValueOfPlanAssets. This rule aggregates the value of member components located on the axis at the highest level of aggregation to avoid double counting in the event that the company uses a hierarchy of members. The properties of this DefinedBenefitPlanFairValueOfPlanAssets fact are: Context: C_ba8856d7-ce05-4312-8cf5-b25ce4871df0 Unit: U_USD. - ap-20231231.htm 11593 - ap-20231231.htm 11593 [DQC.US.0070.7645] The concept DefinedBenefitPlanFairValueOfPlanAssets with a defaulted value of 35876000.000000 is not equal to the aggregated value of the dimensionally qualified components on the axis DefinedBenefitPlanByPlanAssetCategoriesAxis which has an aggregate value of 71752000.000000 based on the data in the filing. The aggregated value is calculated by adding the members in the network http://ampcopgh.com/20231231/taxonomy/role/Role_DisclosurePensionAndOtherPostretirementBenefitsAssetCategoriesBasedOnNatureAndRisksOfPlanAssetsDetail. The values of the calculation components are as follows: 3394000, 0, 0, 0, 35876000, 0, 0, 0, 32482000. The value of a concept broken down by its components along the DefinedBenefitPlanByPlanAssetCategoriesAxis axis should be equal to its component pieces. An error could occur for one of the following reasons: 1. The values of the plan assets by category have been further disaggregated by additional dimensions such as geography. Plan Asset categories should not be dimensionally disaggregated and members should be defined for each security class reported. i.e. Equity Securities in the US should be represented as a single member. 2. The default value of DefinedBenefitPlanFairValueOfPlanAssets is incorrectly totaled for DefinedBenefitPlanFairValueOfPlanAssets 3. Not all dimension members or additional dimensions have been defined on the category axis DefinedBenefitPlanByPlanAssetCategoriesAxis. 4. The filer has reported a sub component of plan assets that does not represent a complete breakdown of the total. In these cases the element DefinedBenefitPlanPlanAssetsInvestmentWithinPlanAssetCategoryAmount should be used instead of the element DefinedBenefitPlanFairValueOfPlanAssets. This rule aggregates the value of member components located on the axis at the highest level of aggregation to avoid double counting in the event that the company uses a hierarchy of members. The properties of this DefinedBenefitPlanFairValueOfPlanAssets fact are: Context: C_80990a64-ca54-4fb3-a92b-25d09190ae20 Unit: U_USD. - ap-20231231.htm 11593 - ap-20231231.htm 11593 [DQC.US.0070.7645] The concept DefinedBenefitPlanFairValueOfPlanAssets with a defaulted value of 6569000.000000 is not equal to the aggregated value of the dimensionally qualified components on the axis DefinedBenefitPlanByPlanAssetCategoriesAxis which has an aggregate value of 13138000.000000 based on the data in the filing. The aggregated value is calculated by adding the members in the network http://ampcopgh.com/20231231/taxonomy/role/Role_DisclosurePensionAndOtherPostretirementBenefitsAssetCategoriesBasedOnNatureAndRisksOfPlanAssetsDetail. The values of the calculation components are as follows: 6569000, 0, 6569000, 0, 0, 0. The value of a concept broken down by its components along the DefinedBenefitPlanByPlanAssetCategoriesAxis axis should be equal to its component pieces. An error could occur for one of the following reasons: 1. The values of the plan assets by category have been further disaggregated by additional dimensions such as geography. Plan Asset categories should not be dimensionally disaggregated and members should be defined for each security class reported. i.e. Equity Securities in the US should be represented as a single member. 2. The default value of DefinedBenefitPlanFairValueOfPlanAssets is incorrectly totaled for DefinedBenefitPlanFairValueOfPlanAssets 3. Not all dimension members or additional dimensions have been defined on the category axis DefinedBenefitPlanByPlanAssetCategoriesAxis. 4. The filer has reported a sub component of plan assets that does not represent a complete breakdown of the total. In these cases the element DefinedBenefitPlanPlanAssetsInvestmentWithinPlanAssetCategoryAmount should be used instead of the element DefinedBenefitPlanFairValueOfPlanAssets. This rule aggregates the value of member components located on the axis at the highest level of aggregation to avoid double counting in the event that the company uses a hierarchy of members. The properties of this DefinedBenefitPlanFairValueOfPlanAssets fact are: Context: C_b948f4f8-3507-4c65-830e-77a675b3f17d Unit: U_USD. - ap-20231231.htm 11593 - ap-20231231.htm 11593 ap-20231231.htm ap-20231231.xsd img137273756_0.jpg http://fasb.org/us-gaap/2023 http://xbrl.sec.gov/dei/2023 false false