<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.25.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>583</ContextCount>
  <ElementCount>628</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>161</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>14</UnitCount>
  <MyReports>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>100000 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DocumentDocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>100010 - Statement - Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_StatementConsolidatedBalanceSheets</Role>
      <ShortName>Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>100040 - Statement - Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_StatementConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Consolidated Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>100050 - Statement - Consolidated Statements of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_StatementConsolidatedStatementsOfOperations</Role>
      <ShortName>Consolidated Statements of Operations</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>100060 - Statement - Consolidated Statements of Comprehensive Loss</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/StatementConsolidatedStatementsOfComprehensiveLoss</Role>
      <ShortName>Consolidated Statements of Comprehensive Loss</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>100070 - Statement - Consolidated Statements of Shareholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_StatementConsolidatedStatementsOfShareholdersEquity</Role>
      <ShortName>Consolidated Statements of Shareholders' Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>100080 - Statement - Consolidated Statements of Shareholders' Equity (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_StatementConsolidatedStatementsOfShareholdersEquityParenthetical</Role>
      <ShortName>Consolidated Statements of Shareholders' Equity (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>100090 - Statement - Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_StatementConsolidatedStatementsOfCashFlows</Role>
      <ShortName>Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>995410 - Disclosure - Pay vs Performance Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/PvpDisclosure</Role>
      <ShortName>Pay vs Performance Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>995445 - Disclosure - Insider Trading Arrangements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements</Role>
      <ShortName>Insider Trading Arrangements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>995455 - Disclosure - Cybersecurity Risk Management, Strategy, and Governance</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/DisclosureCybersecurityRiskManagementStrategyAndGovernance</Role>
      <ShortName>Cybersecurity Risk Management, Strategy, and Governance</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>995465 - Disclosure - Description of Business</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureDescriptionOfBusiness</Role>
      <ShortName>Description of Business</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>995475 - Disclosure - Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>995495 - Disclosure - Inventories</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureInventories</Role>
      <ShortName>Inventories</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>995505 - Disclosure - Contract Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/DisclosureContractAssets</Role>
      <ShortName>Contract Assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>995515 - Disclosure - Property, Plant and Equipment</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosurePropertyPlantAndEquipment</Role>
      <ShortName>Property, Plant and Equipment</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>995525 - Disclosure - Operating Lease Right of Use Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureOperatingLeaseRightOfUseAssets</Role>
      <ShortName>Operating Lease Right of Use Assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>995535 - Disclosure - Intangible Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureIntangibleAssets</Role>
      <ShortName>Intangible Assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>995545 - Disclosure - Investments in Joint Ventures</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureInvestmentsInJointVentures</Role>
      <ShortName>Investments in Joint Ventures</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>995555 - Disclosure - Customer-Related Liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/DisclosureCustomerrelatedLiabilities</Role>
      <ShortName>Customer-Related Liabilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>995565 - Disclosure - Debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureDebt</Role>
      <ShortName>Debt</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>995575 - Disclosure - Operating Lease Liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureOperatingLeaseLiabilities</Role>
      <ShortName>Operating Lease Liabilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>995585 - Disclosure - Pension and Other Postretirement Benefits</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosurePensionAndOtherPostretirementBenefits</Role>
      <ShortName>Pension and Other Postretirement Benefits</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>995595 - Disclosure - Commitments and Contingent Liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureCommitmentsAndContingentLiabilities</Role>
      <ShortName>Commitments and Contingent Liabilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>995605 - Disclosure - Equity Rights Offering</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureEquityRightsOffering</Role>
      <ShortName>Equity Rights Offering</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>995615 - Disclosure - Accumulated Other Comprehensive Loss</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureAccumulatedOtherComprehensiveLoss</Role>
      <ShortName>Accumulated Other Comprehensive Loss</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>995625 - Disclosure - Derivative Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureDerivativeInstruments</Role>
      <ShortName>Derivative Instruments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>995635 - Disclosure - Fair Value</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureFairValue</Role>
      <ShortName>Fair Value</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>995655 - Disclosure - Stock-Based Compensation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureStockBasedCompensation</Role>
      <ShortName>Stock-Based Compensation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>995665 - Disclosure - Research and Development Costs</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureResearchAndDevelopmentCosts</Role>
      <ShortName>Research and Development Costs</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>995675 - Disclosure - Litigation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureLitigation</Role>
      <ShortName>Litigation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>995685 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureIncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>995695 - Disclosure - Environmental Matters</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureEnvironmentalMatters</Role>
      <ShortName>Environmental Matters</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>995705 - Disclosure - Related Parties</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureRelatedParties</Role>
      <ShortName>Related Parties</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>995715 - Disclosure - Business Segments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureBusinessSegments</Role>
      <ShortName>Business Segments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>995725 - Disclosure - Summary of Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>995735 - Disclosure - Inventories (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureInventoriesTables</Role>
      <ShortName>Inventories (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureInventories</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>995745 - Disclosure - Contract Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/DisclosureContractAssetsTables</Role>
      <ShortName>Contract Assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ampcopgh.com/20241231/taxonomy/role/DisclosureContractAssets</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>995755 - Disclosure - Property, Plant and Equipment (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosurePropertyPlantAndEquipmentTables</Role>
      <ShortName>Property, Plant and Equipment (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosurePropertyPlantAndEquipment</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>995765 - Disclosure - Operating Lease Right of Use Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureOperatingLeaseRightOfUseAssetsTables</Role>
      <ShortName>Operating Lease Right of Use Assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureOperatingLeaseRightOfUseAssets</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>995775 - Disclosure - Intangible Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureIntangibleAssetsTables</Role>
      <ShortName>Intangible Assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureIntangibleAssets</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>995785 - Disclosure - Customer-Related Liabilities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/DisclosureCustomerrelatedLiabilitiesTables</Role>
      <ShortName>Customer-Related Liabilities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ampcopgh.com/20241231/taxonomy/role/DisclosureCustomerrelatedLiabilities</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>995795 - Disclosure - Debt (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureDebtTables</Role>
      <ShortName>Debt (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureDebt</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>995805 - Disclosure - Operating Lease Liabilities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureOperatingLeaseLiabilitiesTables</Role>
      <ShortName>Operating Lease Liabilities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureOperatingLeaseLiabilities</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>995815 - Disclosure - Pension and Other Postretirement Benefits (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosurePensionAndOtherPostretirementBenefitsTables</Role>
      <ShortName>Pension and Other Postretirement Benefits (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosurePensionAndOtherPostretirementBenefits</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>995825 - Disclosure - Equity Rights Offering (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureEquityRightsOfferingTables</Role>
      <ShortName>Equity Rights Offering (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureEquityRightsOffering</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>995835 - Disclosure - Accumulated Other Comprehensive Loss (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureAccumulatedOtherComprehensiveLossTables</Role>
      <ShortName>Accumulated Other Comprehensive Loss (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureAccumulatedOtherComprehensiveLoss</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>995845 - Disclosure - Derivative Instruments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureDerivativeInstrumentsTables</Role>
      <ShortName>Derivative Instruments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureDerivativeInstruments</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>995855 - Disclosure - Fair Value (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureFairValueTables</Role>
      <ShortName>Fair Value (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureFairValue</ParentRole>
      <Position>49</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>995875 - Disclosure - Stock-Based Compensation (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureStockBasedCompensationTables</Role>
      <ShortName>Stock-Based Compensation (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureStockBasedCompensation</ParentRole>
      <Position>50</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>995885 - Disclosure - Litigation (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureLitigationTables</Role>
      <ShortName>Litigation (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureLitigation</ParentRole>
      <Position>51</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>995895 - Disclosure - Income Taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureIncomeTaxesTables</Role>
      <ShortName>Income Taxes (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureIncomeTaxes</ParentRole>
      <Position>52</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>995905 - Disclosure - Related Parties (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/DisclosureRelatedPartiesTables</Role>
      <ShortName>Related Parties (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureRelatedParties</ParentRole>
      <Position>53</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>995915 - Disclosure - Business Segments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureBusinessSegmentsTables</Role>
      <ShortName>Business Segments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureBusinessSegments</ParentRole>
      <Position>54</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>995925 - Disclosure - Description of Business - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureDescriptionOfBusinessAdditionalInformationDetail</Role>
      <ShortName>Description of Business - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>995935 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetail</Role>
      <ShortName>Summary of Significant Accounting Policies - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>995945 - Disclosure - Allowance for Credit Losses (Trade Receivables) - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/DisclosureAllowanceForCreditLossesTradeReceivablesAdditionalInformationDetail</Role>
      <ShortName>Allowance for Credit Losses (Trade Receivables) - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>995955 - Disclosure - Inventories - Schedule of Inventories (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureInventoriesScheduleOfInventoriesDetail</Role>
      <ShortName>Inventories - Schedule of Inventories (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>995965 - Disclosure - Contract Assets - Summary of Changes in Contract Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/DisclosureContractAssetsSummaryOfChangesInContractAssetsDetails</Role>
      <ShortName>Contract Assets - Summary of Changes in Contract Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>995975 - Disclosure - Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosurePropertyPlantAndEquipmentScheduleOfPropertyPlantAndEquipmentDetail</Role>
      <ShortName>Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>995985 - Disclosure - Property, Plant and Equipment - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosurePropertyPlantAndEquipmentAdditionalInformationDetail</Role>
      <ShortName>Property, Plant and Equipment - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>995995 - Disclosure - Operating Lease Right-of-Use Assets - Schedule of The Net Book Value of Right-of-Use Assets (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/DisclosureOperatingLeaseRightofuseAssetsScheduleOfTheNetBookValueOfRightofuseAssetsDetail</Role>
      <ShortName>Operating Lease Right-of-Use Assets - Schedule of The Net Book Value of Right-of-Use Assets (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>996005 - Disclosure - Intangible Assets - Schedule of Intangible Assets (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureIntangibleAssetsScheduleOfIntangibleAssetsDetail</Role>
      <ShortName>Intangible Assets - Schedule of Intangible Assets (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>996015 - Disclosure - Intangible Assets - Summary of Changes in Intangible Assets (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureIntangibleAssetsSummaryOfChangesInIntangibleAssetsDetail</Role>
      <ShortName>Intangible Assets - Summary of Changes in Intangible Assets (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>996025 - Disclosure - Intangible Assets - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureIntangibleAssetsAdditionalInformationDetail</Role>
      <ShortName>Intangible Assets - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>996045 - Disclosure - Investments in Joint Ventures - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureInvestmentsInJointVenturesAdditionalInformationDetail</Role>
      <ShortName>Investments in Joint Ventures - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>996055 - Disclosure - Customer-Related Liabilities - Schedule of Changes in Liability for Product Warranty Claims (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/DisclosureCustomerrelatedLiabilitiesScheduleOfChangesInLiabilityForProductWarrantyClaimsDetail</Role>
      <ShortName>Customer-Related Liabilities - Schedule of Changes in Liability for Product Warranty Claims (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>996065 - Disclosure - Customer-Related Liabilities - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/DisclosureCustomerrelatedLiabilitiesAdditionalInformationDetail</Role>
      <ShortName>Customer-Related Liabilities - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>996075 - Disclosure - Customer-Related Liabilities - Schedule of Change in Customer Deposits (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/DisclosureCustomerrelatedLiabilitiesScheduleOfChangeInCustomerDepositsDetail</Role>
      <ShortName>Customer-Related Liabilities - Schedule of Change in Customer Deposits (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>996085 - Disclosure - Debt - Schedule of Debt (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/DisclosureDebtScheduleOfDebtDetail</Role>
      <ShortName>Debt - Schedule of Debt (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>996105 - Disclosure - Debt - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureDebtAdditionalInformationDetail</Role>
      <ShortName>Debt - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>996115 - Disclosure - Operating Lease Liabilities - Summary of Current and Non Current Portions of Operating Lease Arrangements (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureOperatingLeaseLiabilitiesSummaryOfCurrentAndNonCurrentPortionsOfOperatingLeaseArrangementsDetail</Role>
      <ShortName>Operating Lease Liabilities - Summary of Current and Non Current Portions of Operating Lease Arrangements (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>996125 - Disclosure - Operating Lease Liabilities - Summary of Future Operating Lease Payments (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureOperatingLeaseLiabilitiesSummaryOfFutureOperatingLeasePaymentsDetail</Role>
      <ShortName>Operating Lease Liabilities - Summary of Future Operating Lease Payments (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>996135 - Disclosure - Operating Lease Liabilities - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureOperatingLeaseLiabilitiesAdditionalInformationDetail</Role>
      <ShortName>Operating Lease Liabilities - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>996145 - Disclosure - Pension and Other Postretirement Benefits - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosurePensionAndOtherPostretirementBenefitsAdditionalInformationDetail</Role>
      <ShortName>Pension and Other Postretirement Benefits - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>996155 - Disclosure - Pension and Other Postretirement Benefits - Components of Actuarial (Gains) Losses in Projected Benefit Obligations (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/DisclosurePensionAndOtherPostretirementBenefitsComponentsOfActuarialGainsLossesInProjectedBenefitObligationsDetail</Role>
      <ShortName>Pension and Other Postretirement Benefits - Components of Actuarial (Gains) Losses in Projected Benefit Obligations (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>996165 - Disclosure - Pension and Other Postretirement Benefits - Schedule of Changes in Projected Benefit Obligations (PBO) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosurePensionAndOtherPostretirementBenefitsScheduleOfChangesInProjectedBenefitObligationsPBODetail</Role>
      <ShortName>Pension and Other Postretirement Benefits - Schedule of Changes in Projected Benefit Obligations (PBO) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>996175 - Disclosure - Pension and Other Postretirement Benefits - Schedule of Changes in Plan Assets (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosurePensionAndOtherPostretirementBenefitsScheduleOfChangesInPlanAssetsDetail</Role>
      <ShortName>Pension and Other Postretirement Benefits - Schedule of Changes in Plan Assets (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>78</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>996185 - Disclosure - Pension and Other Postretirement Benefits - Schedule of Funded Status of the Plans (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosurePensionAndOtherPostretirementBenefitsScheduleOfFundedStatusOfPlansDetail</Role>
      <ShortName>Pension and Other Postretirement Benefits - Schedule of Funded Status of the Plans (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>79</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>996195 - Disclosure - Pension and Other Postretirement Benefits - Summary of Amounts Recognized in the Consolidated Balance Sheets (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosurePensionAndOtherPostretirementBenefitsSummaryOfAmountsRecognizedInConsolidatedBalanceSheetsDetail</Role>
      <ShortName>Pension and Other Postretirement Benefits - Summary of Amounts Recognized in the Consolidated Balance Sheets (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>996205 - Disclosure - Pension and Other Postretirement Benefits - Schedule of Accumulated Other Comprehensive Loss (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosurePensionAndOtherPostretirementBenefitsScheduleOfAccumulatedOtherComprehensiveLossDetail</Role>
      <ShortName>Pension and Other Postretirement Benefits - Schedule of Accumulated Other Comprehensive Loss (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>996215 - Disclosure - Pension and Other Postretirement Benefits - Schedule of Estimated Benefit Payments (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosurePensionAndOtherPostretirementBenefitsScheduleOfEstimatedBenefitPaymentsDetail</Role>
      <ShortName>Pension and Other Postretirement Benefits - Schedule of Estimated Benefit Payments (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>82</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>996225 - Disclosure - Pension and Other Postretirement Benefits - Summary of Target Asset Allocations and Major Asset Categories (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosurePensionAndOtherPostretirementBenefitsSummaryOfTargetAssetAllocationsAndMajorAssetCategoriesDetail</Role>
      <ShortName>Pension and Other Postretirement Benefits - Summary of Target Asset Allocations and Major Asset Categories (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>83</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>996235 - Disclosure - Pension and Other Postretirement Benefits - Asset Categories Based on the Nature and Risks of the Plan Assets (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosurePensionAndOtherPostretirementBenefitsAssetCategoriesBasedOnNatureAndRisksOfPlanAssetsDetail</Role>
      <ShortName>Pension and Other Postretirement Benefits - Asset Categories Based on the Nature and Risks of the Plan Assets (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>996245 - Disclosure - Pension and Other Postretirement Benefits - Summary of Changes in the Fair Value of the Level 3 Plan Assets for the U.S. and Foreign Pension Benefits Plans (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosurePensionAndOtherPostretirementBenefitsSummaryOfChangesInFairValueOfLevel3PlanAssetsForUSAndForeignPensionBenefitsPlansDetail</Role>
      <ShortName>Pension and Other Postretirement Benefits - Summary of Changes in the Fair Value of the Level 3 Plan Assets for the U.S. and Foreign Pension Benefits Plans (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>85</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>996255 - Disclosure - Pension and Other Postretirement Benefits - Net Periodic Pension and Other Postretirement Benefit Costs (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosurePensionAndOtherPostretirementBenefitsNetPeriodicPensionAndOtherPostretirementBenefitCostsDetail</Role>
      <ShortName>Pension and Other Postretirement Benefits - Net Periodic Pension and Other Postretirement Benefit Costs (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>86</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>996265 - Disclosure - Pension and Other Postretirement Benefits - Discount Rates Used to Determine the Benefit Obligations (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosurePensionAndOtherPostretirementBenefitsDiscountRatesUsedToDetermineBenefitObligationsDetail</Role>
      <ShortName>Pension and Other Postretirement Benefits - Discount Rates Used to Determine the Benefit Obligations (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>87</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>996275 - Disclosure - Pension and Other Postretirement Benefits - Assumptions Regarding Net Periodic Pension and Other Postretirement Benefit Costs (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosurePensionAndOtherPostretirementBenefitsAssumptionsRegardingNetPeriodicPensionAndOtherPostretirementBenefitCostsDetail</Role>
      <ShortName>Pension and Other Postretirement Benefits - Assumptions Regarding Net Periodic Pension and Other Postretirement Benefit Costs (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>88</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>996285 - Disclosure - Commitments and Contingent Liabilities - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureCommitmentsAndContingentLiabilitiesAdditionalInformationDetail</Role>
      <ShortName>Commitments and Contingent Liabilities - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>89</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>996295 - Disclosure - Equity Rights Offering - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureEquityRightsOfferingAdditionalInformationDetail</Role>
      <ShortName>Equity Rights Offering - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>90</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>996305 - Disclosure - Equity Rights Offering - Summary of Outstanding Warrants (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureEquityRightsOfferingSummaryOfOutstandingWarrantsDetail</Role>
      <ShortName>Equity Rights Offering - Summary of Outstanding Warrants (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>91</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>996315 - Disclosure - Accumulated Other Comprehensive Loss - Net Changes and Ending Balances for Various Components of Accumulated Other Comprehensive Loss (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/DisclosureAccumulatedOtherComprehensiveLossNetChangesAndEndingBalancesForVariousComponentsOfAccumulatedOtherComprehensiveLossDetail</Role>
      <ShortName>Accumulated Other Comprehensive Loss - Net Changes and Ending Balances for Various Components of Accumulated Other Comprehensive Loss (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>92</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>996325 - Disclosure - Accumulated Other Comprehensive Loss - Line Items Affected on Consolidated Statements of Operations for Components Reclassified from Accumulated Other Comprehensive Loss (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureAccumulatedOtherComprehensiveLossLineItemsAffectedOnConsolidatedStatementsOfOperationsForComponentsReclassifiedFromAccumulatedOtherComprehensiveLossDetail</Role>
      <ShortName>Accumulated Other Comprehensive Loss - Line Items Affected on Consolidated Statements of Operations for Components Reclassified from Accumulated Other Comprehensive Loss (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>93</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>996335 - Disclosure - Accumulated Other Comprehensive Loss - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureAccumulatedOtherComprehensiveLossAdditionalInformationDetail</Role>
      <ShortName>Accumulated Other Comprehensive Loss - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>94</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R95.htm</HtmlFileName>
      <LongName>996345 - Disclosure - Accumulated Other Comprehensive Loss - Summary of Income Tax Effect Associated With Various Components of Other Comprehensive (Loss) Income (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/DisclosureAccumulatedOtherComprehensiveLossSummaryOfIncomeTaxEffectAssociatedWithVariousComponentsOfOtherComprehensiveLossIncomeDetail</Role>
      <ShortName>Accumulated Other Comprehensive Loss - Summary of Income Tax Effect Associated With Various Components of Other Comprehensive (Loss) Income (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>95</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R96.htm</HtmlFileName>
      <LongName>996355 - Disclosure - Derivative Instruments - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureDerivativeInstrumentsAdditionalInformationDetail</Role>
      <ShortName>Derivative Instruments - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>96</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R97.htm</HtmlFileName>
      <LongName>996375 - Disclosure - Derivative Instruments - Summary of Amount Recognized as and Reclassified from Accumulated Other Comprehensive Income (Loss) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureDerivativeInstrumentsSummaryOfAmountRecognizedAsAndReclassifiedFromAccumulatedOtherComprehensiveIncomeLossDetail</Role>
      <ShortName>Derivative Instruments - Summary of Amount Recognized as and Reclassified from Accumulated Other Comprehensive Income (Loss) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>97</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R98.htm</HtmlFileName>
      <LongName>996385 - Disclosure - Derivative Instruments - Summary of Change in Fair Value Reclassified or Expected to be Reclassified from Accumulated Other Comprehensive Loss to Earnings (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureDerivativeInstrumentsSummaryOfChangeInFairValueReclassifiedOrExpectedToBeReclassifiedFromAccumulatedOtherComprehensiveLossToEarningsDetail</Role>
      <ShortName>Derivative Instruments - Summary of Change in Fair Value Reclassified or Expected to be Reclassified from Accumulated Other Comprehensive Loss to Earnings (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>98</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R99.htm</HtmlFileName>
      <LongName>996395 - Disclosure - Fair Value - Fair Value of Financial Assets and Liabilities (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureFairValueFairValueOfFinancialAssetsAndLiabilitiesDetail</Role>
      <ShortName>Fair Value - Fair Value of Financial Assets and Liabilities (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>99</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R100.htm</HtmlFileName>
      <LongName>996405 - Disclosure - Stock-Based Compensation - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureStockBasedCompensationAdditionalInformationDetail</Role>
      <ShortName>Stock-Based Compensation - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>100</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R101.htm</HtmlFileName>
      <LongName>996415 - Disclosure - Stock-Based Compensation - Summary of Outstanding Restricted Stock Units ("RSU") and Performance Share Awards ("PSU") (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureStockBasedCompensationSummaryOfOutstandingRestrictedStockUnitsRSUAndPerformanceShareAwardsPSUDetail</Role>
      <ShortName>Stock-Based Compensation - Summary of Outstanding Restricted Stock Units ("RSU") and Performance Share Awards ("PSU") (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>101</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R102.htm</HtmlFileName>
      <LongName>996425 - Disclosure - Stock-Based Compensation - Summary of Outstanding Stock Options (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureStockBasedCompensationSummaryOfOutstandingStockOptionsDetail</Role>
      <ShortName>Stock-Based Compensation - Summary of Outstanding Stock Options (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>102</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R103.htm</HtmlFileName>
      <LongName>996435 - Disclosure - Stock-Based Compensation - Summary of Outstanding Restricted Stock Awards (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/DisclosureStockbasedCompensationSummaryOfOutstandingRestrictedStockAwardsDetail</Role>
      <ShortName>Stock-Based Compensation - Summary of Outstanding Restricted Stock Awards (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>103</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R104.htm</HtmlFileName>
      <LongName>996445 - Disclosure - Research and Development Costs - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureResearchAndDevelopmentCostsAdditionalInformationDetail</Role>
      <ShortName>Research and Development Costs - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>104</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R105.htm</HtmlFileName>
      <LongName>996455 - Disclosure - Litigation - Schedule of Loss Contingencies by Contingency (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureLitigationScheduleOfLossContingenciesByContingencyDetail</Role>
      <ShortName>Litigation - Schedule of Loss Contingencies by Contingency (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>105</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R106.htm</HtmlFileName>
      <LongName>996465 - Disclosure - Litigation - Schedule of Loss Contingencies by Contingency (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureLitigationScheduleOfLossContingenciesByContingencyParentheticalDetail</Role>
      <ShortName>Litigation - Schedule of Loss Contingencies by Contingency (Parenthetical) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>106</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R107.htm</HtmlFileName>
      <LongName>996475 - Disclosure - Litigation - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureLitigationAdditionalInformationDetail</Role>
      <ShortName>Litigation - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>107</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R108.htm</HtmlFileName>
      <LongName>996485 - Disclosure - Litigation - Summary of Activity Relating to Asbestos Liability (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/DisclosureLitigationSummaryOfActivityRelatingToAsbestosLiabilityDetails</Role>
      <ShortName>Litigation - Summary of Activity Relating to Asbestos Liability (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>108</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R109.htm</HtmlFileName>
      <LongName>996495 - Disclosure - Litigation - Summary of Activity in Asbestos Insurance Recoveries (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureLitigationSummaryOfActivityInAsbestosInsuranceRecoveriesDetail</Role>
      <ShortName>Litigation - Summary of Activity in Asbestos Insurance Recoveries (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>109</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R110.htm</HtmlFileName>
      <LongName>996505 - Disclosure - Litigation - Summary of Asbestos Related Costs (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/DisclosureLitigationSummaryOfAsbestosRelatedCostsDetail</Role>
      <ShortName>Litigation - Summary of Asbestos Related Costs (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>110</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R111.htm</HtmlFileName>
      <LongName>996515 - Disclosure - Income Taxes - Income (loss) from Operations Before Income Taxes (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/DisclosureIncomeTaxesIncomeLossFromOperationsBeforeIncomeTaxesDetail</Role>
      <ShortName>Income Taxes - Income (loss) from Operations Before Income Taxes (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>111</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R112.htm</HtmlFileName>
      <LongName>996525 - Disclosure - Income Taxes - Summary of Income Tax Provision (Benefit) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/DisclosureIncomeTaxesSummaryOfIncomeTaxProvisionBenefitDetail</Role>
      <ShortName>Income Taxes - Summary of Income Tax Provision (Benefit) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>112</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R113.htm</HtmlFileName>
      <LongName>996535 - Disclosure - Income Taxes - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureIncomeTaxesAdditionalInformationDetail</Role>
      <ShortName>Income Taxes - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>113</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R114.htm</HtmlFileName>
      <LongName>996545 - Disclosure - Income Taxes - Difference Between Statutory U.S. Federal Income Tax and the Corporation's Effective Income Tax (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureIncomeTaxesDifferenceBetweenStatutoryUSFederalIncomeTaxAndCorporationSEffectiveIncomeTaxDetail</Role>
      <ShortName>Income Taxes - Difference Between Statutory U.S. Federal Income Tax and the Corporation's Effective Income Tax (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>114</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R115.htm</HtmlFileName>
      <LongName>996555 - Disclosure - Income Taxes - Deferred Income Tax Assets and Liabilities (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureIncomeTaxesDeferredIncomeTaxAssetsAndLiabilitiesDetail</Role>
      <ShortName>Income Taxes - Deferred Income Tax Assets and Liabilities (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>115</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R116.htm</HtmlFileName>
      <LongName>996565 - Disclosure - Environmental Matters - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureEnvironmentalMattersAdditionalInformationDetail</Role>
      <ShortName>Environmental Matters - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>116</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R117.htm</HtmlFileName>
      <LongName>996575 - Disclosure - Related Parties - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureRelatedPartiesAdditionalInformationDetail</Role>
      <ShortName>Related Parties - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>117</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R118.htm</HtmlFileName>
      <LongName>996585 - Disclosure - Related Parties - Summary of Loan Activity (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/DisclosureRelatedPartiesSummaryOfLoanActivityDetail</Role>
      <ShortName>Related Parties - Summary of Loan Activity (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>118</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R119.htm</HtmlFileName>
      <LongName>996595 - Disclosure - Related Parties - Summary of Sales to and Purchases from ATR's Minority Shareholder and Its Affiliates (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/DisclosureRelatedPartiesSummaryOfSalesToAndPurchasesFromAtrsMinorityShareholderAndItsAffiliatesDetail</Role>
      <ShortName>Related Parties - Summary of Sales to and Purchases from ATR's Minority Shareholder and Its Affiliates (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>119</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R120.htm</HtmlFileName>
      <LongName>996605 - Disclosure - Related Parties - Summary of Balances Outstanding with ATR's Minority Shareholder and Its Affiliates (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/DisclosureRelatedPartiesSummaryOfBalancesOutstandingWithAtrsMinorityShareholderAndItsAffiliatesDetail</Role>
      <ShortName>Related Parties - Summary of Balances Outstanding with ATR's Minority Shareholder and Its Affiliates (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>120</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R121.htm</HtmlFileName>
      <LongName>996615 - Disclosure - Business Segments - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/Role_DisclosureBusinessSegmentsAdditionalInformationDetail</Role>
      <ShortName>Business Segments - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>121</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R122.htm</HtmlFileName>
      <LongName>996625 - Disclosure - Business Segments - Summary of Net Sales By Product Line (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/DisclosureBusinessSegmentsSummaryOfNetSalesByProductLineDetail</Role>
      <ShortName>Business Segments - Summary of Net Sales By Product Line (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>122</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R123.htm</HtmlFileName>
      <LongName>996635 - Disclosure - Business Segments - Schedule of Financial Information Concerning Corporation's Reportable Segments (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/DisclosureBusinessSegmentsScheduleOfFinancialInformationConcerningCorporationsReportableSegmentsDetail</Role>
      <ShortName>Business Segments - Schedule of Financial Information Concerning Corporation's Reportable Segments (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>123</Position>
    </Report>
    <Report instance="ap-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R124.htm</HtmlFileName>
      <LongName>996645 - Disclosure - Business Segments - Schedule of Financial Information Concerning Corporation's Reportable Segments (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20241231/taxonomy/role/DisclosureBusinessSegmentsScheduleOfFinancialInformationConcerningCorporationsReportableSegmentsParentheticalDetail</Role>
      <ShortName>Business Segments - Schedule of Financial Information Concerning Corporation's Reportable Segments (Parenthetical) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>124</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="10-K" isDefinitelyFs="true" isUsgaap="true" original="ap-20241231.htm">ap-20241231.htm</File>
    <File>ap-20241231.xsd</File>
  </InputFiles>
  <SupplementalFiles>
    <File>img138197277_0.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="1429">http://fasb.org/us-gaap/2024</BaseTaxonomy>
    <BaseTaxonomy items="10">http://xbrl.sec.gov/cyd/2024</BaseTaxonomy>
    <BaseTaxonomy items="43">http://xbrl.sec.gov/dei/2024</BaseTaxonomy>
    <BaseTaxonomy items="4">http://xbrl.sec.gov/ecd/2024</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>false</HasPresentationLinkbase>
  <HasCalculationLinkbase>false</HasCalculationLinkbase>
</FilingSummary>
