<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.23.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>601</ContextCount>
  <ElementCount>595</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>161</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>16</UnitCount>
  <MyReports>
    <Report instance="ap-20221231.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/20221231/taxonomy/role/Role_DocumentDocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="ap-20221231.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/20221231/taxonomy/role/Role_StatementConsolidatedBalanceSheets</Role>
      <ShortName>Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>100020 - Statement - Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_StatementConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Consolidated Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>100030 - Statement - Consolidated Statements of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_StatementConsolidatedStatementsOfOperations</Role>
      <ShortName>Consolidated Statements of Operations</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>100040 - Statement - Consolidated Statements of Comprehensive Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_StatementConsolidatedStatementsOfComprehensiveIncome</Role>
      <ShortName>Consolidated Statements of Comprehensive Income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>100050 - Statement - Consolidated Statements of Shareholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_StatementConsolidatedStatementsOfShareholdersEquity</Role>
      <ShortName>Consolidated Statements of Shareholders' Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>100060 - Statement - Consolidated Statements of Shareholders' Equity (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_StatementConsolidatedStatementsOfShareholdersEquityParenthetical</Role>
      <ShortName>Consolidated Statements of Shareholders' Equity (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>100070 - Statement - Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_StatementConsolidatedStatementsOfCashFlows</Role>
      <ShortName>Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>100080 - Disclosure - Description of Business</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureDescriptionOfBusiness</Role>
      <ShortName>Description of Business</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>100090 - Disclosure - Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>100100 - Disclosure - Change in Method of Accounting for Inventory Valuation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/DisclosureChangeInMethodOfAccountingForInventoryValuation</Role>
      <ShortName>Change in Method of Accounting for Inventory Valuation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>100110 - Disclosure - Inventories</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureInventories</Role>
      <ShortName>Inventories</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>100120 - Disclosure - Property, Plant and Equipment</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosurePropertyPlantAndEquipment</Role>
      <ShortName>Property, Plant and Equipment</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>100130 - Disclosure - Operating Lease Right of Use Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureOperatingLeaseRightOfUseAssets</Role>
      <ShortName>Operating Lease Right of Use Assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>100140 - Disclosure - Intangible Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureIntangibleAssets</Role>
      <ShortName>Intangible Assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>100150 - Disclosure - Investments in Joint Ventures</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureInvestmentsInJointVentures</Role>
      <ShortName>Investments in Joint Ventures</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>100160 - Disclosure - Other Current Liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureOtherCurrentLiabilities</Role>
      <ShortName>Other Current Liabilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>100170 - Disclosure - Debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureDebt</Role>
      <ShortName>Debt</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>100180 - Disclosure - Operating Lease Liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureOperatingLeaseLiabilities</Role>
      <ShortName>Operating Lease Liabilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>100190 - Disclosure - Pension and Other Postretirement Benefits</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosurePensionAndOtherPostretirementBenefits</Role>
      <ShortName>Pension and Other Postretirement Benefits</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>100200 - Disclosure - Commitments and Contingent Liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureCommitmentsAndContingentLiabilities</Role>
      <ShortName>Commitments and Contingent Liabilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>100210 - Disclosure - Equity Rights Offering</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureEquityRightsOffering</Role>
      <ShortName>Equity Rights Offering</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>100220 - Disclosure - Accumulated Other Comprehensive Loss</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureAccumulatedOtherComprehensiveLoss</Role>
      <ShortName>Accumulated Other Comprehensive Loss</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>100230 - Disclosure - Derivative Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureDerivativeInstruments</Role>
      <ShortName>Derivative Instruments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>100240 - Disclosure - Fair Value</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureFairValue</Role>
      <ShortName>Fair Value</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>100250 - Disclosure - Revenue</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureRevenue</Role>
      <ShortName>Revenue</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>100260 - Disclosure - Stock-Based Compensation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureStockBasedCompensation</Role>
      <ShortName>Stock-Based Compensation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>100270 - Disclosure - Research and Development Costs</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureResearchAndDevelopmentCosts</Role>
      <ShortName>Research and Development Costs</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>100280 - Disclosure - Litigation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureLitigation</Role>
      <ShortName>Litigation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>100290 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureIncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>100300 - Disclosure - Environmental Matters</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureEnvironmentalMatters</Role>
      <ShortName>Environmental Matters</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>100310 - Disclosure - Related Parties</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureRelatedParties</Role>
      <ShortName>Related Parties</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>100320 - Disclosure - Business Segments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureBusinessSegments</Role>
      <ShortName>Business Segments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>100330 - Disclosure - Summary of Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>100340 - Disclosure - Change in Method of Accounting for Inventory Valuation (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/DisclosureChangeInMethodOfAccountingForInventoryValuationTables</Role>
      <ShortName>Change in Method of Accounting for Inventory Valuation (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ampcopgh.com/20221231/taxonomy/role/DisclosureChangeInMethodOfAccountingForInventoryValuation</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>100350 - Disclosure - Inventories (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureInventoriesTables</Role>
      <ShortName>Inventories (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureInventories</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>100360 - Disclosure - Property, Plant and Equipment (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosurePropertyPlantAndEquipmentTables</Role>
      <ShortName>Property, Plant and Equipment (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosurePropertyPlantAndEquipment</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>100370 - Disclosure - Operating Lease Right of Use Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureOperatingLeaseRightOfUseAssetsTables</Role>
      <ShortName>Operating Lease Right of Use Assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureOperatingLeaseRightOfUseAssets</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>100380 - Disclosure - Intangible Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureIntangibleAssetsTables</Role>
      <ShortName>Intangible Assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureIntangibleAssets</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>100390 - Disclosure - Other Current Liabilities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureOtherCurrentLiabilitiesTables</Role>
      <ShortName>Other Current Liabilities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureOtherCurrentLiabilities</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>100400 - Disclosure - Debt (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureDebtTables</Role>
      <ShortName>Debt (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureDebt</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>100410 - Disclosure - Operating Lease Liabilities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureOperatingLeaseLiabilitiesTables</Role>
      <ShortName>Operating Lease Liabilities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureOperatingLeaseLiabilities</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>100420 - Disclosure - Pension and Other Postretirement Benefits (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosurePensionAndOtherPostretirementBenefitsTables</Role>
      <ShortName>Pension and Other Postretirement Benefits (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosurePensionAndOtherPostretirementBenefits</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>100430 - Disclosure - Equity Rights Offering (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureEquityRightsOfferingTables</Role>
      <ShortName>Equity Rights Offering (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureEquityRightsOffering</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>100440 - Disclosure - Accumulated Other Comprehensive Loss (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureAccumulatedOtherComprehensiveLossTables</Role>
      <ShortName>Accumulated Other Comprehensive Loss (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureAccumulatedOtherComprehensiveLoss</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>100450 - Disclosure - Derivative Instruments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureDerivativeInstrumentsTables</Role>
      <ShortName>Derivative Instruments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureDerivativeInstruments</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>100460 - Disclosure - Fair Value (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureFairValueTables</Role>
      <ShortName>Fair Value (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureFairValue</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>100470 - Disclosure - Revenue (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureRevenueTables</Role>
      <ShortName>Revenue (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureRevenue</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>100480 - Disclosure - Stock-Based Compensation (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureStockBasedCompensationTables</Role>
      <ShortName>Stock-Based Compensation (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureStockBasedCompensation</ParentRole>
      <Position>49</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>100490 - Disclosure - Litigation (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureLitigationTables</Role>
      <ShortName>Litigation (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureLitigation</ParentRole>
      <Position>50</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>100500 - Disclosure - Income Taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureIncomeTaxesTables</Role>
      <ShortName>Income Taxes (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureIncomeTaxes</ParentRole>
      <Position>51</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>100510 - Disclosure - Business Segments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureBusinessSegmentsTables</Role>
      <ShortName>Business Segments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureBusinessSegments</ParentRole>
      <Position>52</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>100520 - Disclosure - Description of Business - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureDescriptionOfBusinessAdditionalInformationDetail</Role>
      <ShortName>Description of Business - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>100530 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetail</Role>
      <ShortName>Summary of Significant Accounting Policies - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>100540 - Disclosure - Change in Method of Accounting for Inventory Valuation (Additional Information) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/DisclosureChangeInMethodOfAccountingForInventoryValuationAdditionalInformationDetail</Role>
      <ShortName>Change in Method of Accounting for Inventory Valuation (Additional Information) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ampcopgh.com/20221231/taxonomy/role/DisclosureChangeInMethodOfAccountingForInventoryValuationTables</ParentRole>
      <Position>55</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>100550 - Disclosure - Change in Method of Accounting for Inventory Valuation - Schedule of Consolidated Statement of Operations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/DisclosureChangeInMethodOfAccountingForInventoryValuationScheduleOfConsolidatedStatementOfOperationsDetails</Role>
      <ShortName>Change in Method of Accounting for Inventory Valuation - Schedule of Consolidated Statement of Operations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>100560 - Disclosure - Change in Method of Accounting for Inventory Valuation - Schedule of Consolidated Balance Sheet (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/DisclosureChangeInMethodOfAccountingForInventoryValuationScheduleOfConsolidatedBalanceSheetDetails</Role>
      <ShortName>Change in Method of Accounting for Inventory Valuation - Schedule of Consolidated Balance Sheet (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>100570 - Disclosure - Change in Method of Accounting for Inventory Valuation - Schedule of Consolidated Statement of Cash Flows (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/DisclosureChangeInMethodOfAccountingForInventoryValuationScheduleOfConsolidatedStatementOfCashFlowsDetails</Role>
      <ShortName>Change in Method of Accounting for Inventory Valuation - Schedule of Consolidated Statement of Cash Flows (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>100580 - Disclosure - Inventories - Schedule of Inventories (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureInventoriesScheduleOfInventoriesDetail</Role>
      <ShortName>Inventories - Schedule of Inventories (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>100590 - Disclosure - Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/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-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>100600 - Disclosure - Property, Plant and Equipment - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosurePropertyPlantAndEquipmentAdditionalInformationDetail</Role>
      <ShortName>Property, Plant and Equipment - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>100610 - Disclosure - Operating Lease Right-of-Use Assets - Schedule of Right-of-Use Assets Associated with Operating Leases (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureOperatingLeaseRightOfUseAssetsScheduleOfRightOfUseAssetsAssociatedWithOperatingLeasesDetail</Role>
      <ShortName>Operating Lease Right-of-Use Assets - Schedule of Right-of-Use Assets Associated with Operating Leases (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>100620 - Disclosure - Intangible Assets - Schedule of Intangible Assets (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureIntangibleAssetsScheduleOfIntangibleAssetsDetail</Role>
      <ShortName>Intangible Assets - Schedule of Intangible Assets (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>100630 - Disclosure - Intangible Assets - Summary of Changes in Intangible Assets (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/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-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>100640 - Disclosure - Intangible Assets - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureIntangibleAssetsAdditionalInformationDetail</Role>
      <ShortName>Intangible Assets - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>100650 - Disclosure - Investments in Joint Ventures - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureInvestmentsInJointVenturesAdditionalInformationDetail</Role>
      <ShortName>Investments in Joint Ventures - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>100660 - Disclosure - Other Current Liabilities - Schedule of Other Current Liabilities (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureOtherCurrentLiabilitiesScheduleOfOtherCurrentLiabilitiesDetail</Role>
      <ShortName>Other Current Liabilities - Schedule of Other Current Liabilities (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>100680 - Disclosure - Other Current Liabilities - Schedule of Changes in Liability for Product Warranty Claims (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureOtherCurrentLiabilitiesScheduleOfChangesInLiabilityForProductWarrantyClaimsDetail</Role>
      <ShortName>Other Current Liabilities - Schedule of Changes in Liability for Product Warranty Claims (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>100690 - Disclosure - Other Current Liabilities - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureOtherCurrentLiabilitiesAdditionalInformationDetail</Role>
      <ShortName>Other Current Liabilities - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>100700 - Disclosure - Other Current Liabilities - Schedule of Change in Customer Deposits (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureOtherCurrentLiabilitiesScheduleOfChangeInCustomerDepositsDetail</Role>
      <ShortName>Other Current Liabilities - Schedule of Change in Customer Deposits (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>100710 - Disclosure - Debt - Schedule of Debt (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/DisclosureDebtScheduleOfDebtDetail</Role>
      <ShortName>Debt - Schedule of Debt (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>100720 - Disclosure - Debt - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureDebtAdditionalInformationDetail</Role>
      <ShortName>Debt - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>100740 - Disclosure - Operating Lease Liabilities - Summary of Current and Non Current Portions of Operating Lease Arrangements (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/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>73</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>100750 - Disclosure - Operating Lease Liabilities - Summary of Future Operating Lease Payments (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureOperatingLeaseLiabilitiesSummaryOfFutureOperatingLeasePaymentsDetail</Role>
      <ShortName>Operating Lease Liabilities - Summary of Future Operating Lease Payments (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>100760 - Disclosure - Operating Lease Liabilities - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureOperatingLeaseLiabilitiesAdditionalInformationDetail</Role>
      <ShortName>Operating Lease Liabilities - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>100770 - Disclosure - Operating Lease Liabilities - Components of Lease Cost (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureOperatingLeaseLiabilitiesComponentsOfLeaseCostDetail</Role>
      <ShortName>Operating Lease Liabilities - Components of Lease Cost (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>100780 - Disclosure - Pension and Other Postretirement Benefits - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosurePensionAndOtherPostretirementBenefitsAdditionalInformationDetail</Role>
      <ShortName>Pension and Other Postretirement Benefits - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>100790 - Disclosure - Pension and Other Postretirement Benefits - Components of Actuarial (Gains) Losses (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosurePensionAndOtherPostretirementBenefitsComponentsOfActuarialGainsLossesDetail</Role>
      <ShortName>Pension and Other Postretirement Benefits - Components of Actuarial (Gains) Losses (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>78</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>100800 - Disclosure - Pension and Other Postretirement Benefits - Schedule of Changes in Projected Benefit Obligations (PBO) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/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>79</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>100810 - Disclosure - Pension and Other Postretirement Benefits - Schedule of Changes in Plan Assets (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosurePensionAndOtherPostretirementBenefitsScheduleOfChangesInPlanAssetsDetail</Role>
      <ShortName>Pension and Other Postretirement Benefits - Schedule of Changes in Plan Assets (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>100820 - Disclosure - Pension and Other Postretirement Benefits - Schedule of Funded Status of the Plans (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosurePensionAndOtherPostretirementBenefitsScheduleOfFundedStatusOfPlansDetail</Role>
      <ShortName>Pension and Other Postretirement Benefits - Schedule of Funded Status of the Plans (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>100830 - Disclosure - Pension and Other Postretirement Benefits - Summary of Amounts Recognized in the Consolidated Balance Sheets (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/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>82</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>100840 - Disclosure - Pension and Other Postretirement Benefits - Schedule of Accumulated Other Comprehensive Loss (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosurePensionAndOtherPostretirementBenefitsScheduleOfAccumulatedOtherComprehensiveLossDetail</Role>
      <ShortName>Pension and Other Postretirement Benefits - Schedule of Accumulated Other Comprehensive Loss (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>83</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>100850 - Disclosure - Pension and Other Postretirement Benefits - Schedule of Estimated Benefit Payments (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosurePensionAndOtherPostretirementBenefitsScheduleOfEstimatedBenefitPaymentsDetail</Role>
      <ShortName>Pension and Other Postretirement Benefits - Schedule of Estimated Benefit Payments (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>100860 - Disclosure - Pension and Other Postretirement Benefits - Summary of Target Asset Allocations and Major Asset Categories (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/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>85</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>100870 - 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/20221231/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>86</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>100880 - Disclosure - Pension and Other Postretirement Benefits - Asset Categories Based on the Nature and Risks of the Plan Assets (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosurePensionAndOtherPostretirementBenefitsAssetCategoriesBasedOnNatureAndRisksOfPlanAssetsParentheticalDetail</Role>
      <ShortName>Pension and Other Postretirement Benefits - Asset Categories Based on the Nature and Risks of the Plan Assets (Parenthetical) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>87</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>100890 - 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/20221231/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>88</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>100900 - Disclosure - Pension and Other Postretirement Benefits - Net Periodic Pension and Other Postretirement Benefit Costs (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/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>89</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>100910 - Disclosure - Pension and Other Postretirement Benefits - Discount Rates Used to Determine the Benefit Obligations (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/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>90</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>100920 - 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/20221231/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>91</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>100930 - Disclosure - Commitments and Contingent Liabilities - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureCommitmentsAndContingentLiabilitiesAdditionalInformationDetail</Role>
      <ShortName>Commitments and Contingent Liabilities - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>92</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>100940 - Disclosure - Equity Rights Offering - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureEquityRightsOfferingAdditionalInformationDetail</Role>
      <ShortName>Equity Rights Offering - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>93</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>100950 - Disclosure - Equity Rights Offering - Summary of Outstanding Warrants (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureEquityRightsOfferingSummaryOfOutstandingWarrantsDetail</Role>
      <ShortName>Equity Rights Offering - Summary of Outstanding Warrants (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>94</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R95.htm</HtmlFileName>
      <LongName>100960 - Disclosure - Accumulated Other Comprehensive Loss - Net Changes and Ending Balances for Various Components of Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Loss (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureAccumulatedOtherComprehensiveLossNetChangesAndEndingBalancesForVariousComponentsOfOtherComprehensiveIncomeLossAndAccumulatedOtherComprehensiveLossDetail</Role>
      <ShortName>Accumulated Other Comprehensive Loss - Net Changes and Ending Balances for Various Components of Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Loss (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>95</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R96.htm</HtmlFileName>
      <LongName>100970 - 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/20221231/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>96</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R97.htm</HtmlFileName>
      <LongName>100980 - Disclosure - Accumulated Other Comprehensive Loss - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureAccumulatedOtherComprehensiveLossAdditionalInformationDetail</Role>
      <ShortName>Accumulated Other Comprehensive Loss - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>97</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R98.htm</HtmlFileName>
      <LongName>100990 - Disclosure - Accumulated Other Comprehensive Loss - Summary of Income Tax Effect Associated With Various Components of Other Comprehensive Income (Loss) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/DisclosureAccumulatedOtherComprehensiveLossSummaryOfIncomeTaxEffectAssociatedWithVariousComponentsOfOtherComprehensiveIncomeLossDetail</Role>
      <ShortName>Accumulated Other Comprehensive Loss - Summary of Income Tax Effect Associated With Various Components of Other Comprehensive Income (Loss) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>98</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R99.htm</HtmlFileName>
      <LongName>101000 - Disclosure - Derivative Instruments - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureDerivativeInstrumentsAdditionalInformationDetail</Role>
      <ShortName>Derivative Instruments - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>99</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R100.htm</HtmlFileName>
      <LongName>101020 - 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/20221231/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>100</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R101.htm</HtmlFileName>
      <LongName>101030 - 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/20221231/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>101</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R102.htm</HtmlFileName>
      <LongName>101040 - Disclosure - Fair Value - Fair Value of Financial Assets and Liabilities (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureFairValueFairValueOfFinancialAssetsAndLiabilitiesDetail</Role>
      <ShortName>Fair Value - Fair Value of Financial Assets and Liabilities (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>102</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R103.htm</HtmlFileName>
      <LongName>101050 - Disclosure - Revenue - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureRevenueAdditionalInformationDetail</Role>
      <ShortName>Revenue - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>103</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R104.htm</HtmlFileName>
      <LongName>101060 - Disclosure - Revenue - Net Sales (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureRevenueNetSalesDetail</Role>
      <ShortName>Revenue - Net Sales (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>104</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R105.htm</HtmlFileName>
      <LongName>101070 - Disclosure - Stock-Based Compensation - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureStockBasedCompensationAdditionalInformationDetail</Role>
      <ShortName>Stock-Based Compensation - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>105</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R106.htm</HtmlFileName>
      <LongName>101080 - 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/20221231/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>106</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R107.htm</HtmlFileName>
      <LongName>101090 - Disclosure - Stock-Based Compensation - Summary of Outstanding Stock Options (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureStockBasedCompensationSummaryOfOutstandingStockOptionsDetail</Role>
      <ShortName>Stock-Based Compensation - Summary of Outstanding Stock Options (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>107</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R108.htm</HtmlFileName>
      <LongName>101100 - Disclosure - Research and Development Costs - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureResearchAndDevelopmentCostsAdditionalInformationDetail</Role>
      <ShortName>Research and Development Costs - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>108</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R109.htm</HtmlFileName>
      <LongName>101110 - Disclosure - Litigation - Schedule of Loss Contingencies by Contingency (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureLitigationScheduleOfLossContingenciesByContingencyDetail</Role>
      <ShortName>Litigation - Schedule of Loss Contingencies by Contingency (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>109</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R110.htm</HtmlFileName>
      <LongName>101120 - Disclosure - Litigation - Schedule of Loss Contingencies by Contingency (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureLitigationScheduleOfLossContingenciesByContingencyParentheticalDetail</Role>
      <ShortName>Litigation - Schedule of Loss Contingencies by Contingency (Parenthetical) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>110</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R111.htm</HtmlFileName>
      <LongName>101130 - Disclosure - Litigation - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureLitigationAdditionalInformationDetail</Role>
      <ShortName>Litigation - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>111</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R112.htm</HtmlFileName>
      <LongName>101140 - Disclosure - Litigation - Summary of Activity Relating to Asbestos Liability (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/DisclosureLitigationSummaryOfActivityRelatingToAsbestosLiabilityDetails</Role>
      <ShortName>Litigation - Summary of Activity Relating to Asbestos Liability (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>112</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R113.htm</HtmlFileName>
      <LongName>101150 - Disclosure - Litigation - Summary of Activity in Asbestos Insurance Recoveries (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureLitigationSummaryOfActivityInAsbestosInsuranceRecoveriesDetail</Role>
      <ShortName>Litigation - Summary of Activity in Asbestos Insurance Recoveries (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>113</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R114.htm</HtmlFileName>
      <LongName>101160 - Disclosure - Income Taxes - Income (Loss) from Operations Before Income Taxes (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/DisclosureIncomeTaxesIncomeLossFromOperationsBeforeIncomeTaxesDetail</Role>
      <ShortName>Income Taxes - Income (Loss) from Operations Before Income Taxes (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>114</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R115.htm</HtmlFileName>
      <LongName>101170 - Disclosure - Income Taxes - Summary of Income Tax Provision (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/DisclosureIncomeTaxesSummaryOfIncomeTaxProvisionDetail</Role>
      <ShortName>Income Taxes - Summary of Income Tax Provision (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>115</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R116.htm</HtmlFileName>
      <LongName>101180 - Disclosure - Income Taxes - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureIncomeTaxesAdditionalInformationDetail</Role>
      <ShortName>Income Taxes - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>116</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R117.htm</HtmlFileName>
      <LongName>101190 - 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/20221231/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>117</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R118.htm</HtmlFileName>
      <LongName>101200 - Disclosure - Income Taxes - Deferred Income Tax Assets and Liabilities (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureIncomeTaxesDeferredIncomeTaxAssetsAndLiabilitiesDetail</Role>
      <ShortName>Income Taxes - Deferred Income Tax Assets and Liabilities (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>118</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R119.htm</HtmlFileName>
      <LongName>101210 - Disclosure - Environmental Matters - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureEnvironmentalMattersAdditionalInformationDetail</Role>
      <ShortName>Environmental Matters - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>119</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R120.htm</HtmlFileName>
      <LongName>101220 - Disclosure - Related Parties - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureRelatedPartiesAdditionalInformationDetail</Role>
      <ShortName>Related Parties - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>120</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R121.htm</HtmlFileName>
      <LongName>101230 - Disclosure - Business Segments - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureBusinessSegmentsAdditionalInformationDetail</Role>
      <ShortName>Business Segments - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>121</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R122.htm</HtmlFileName>
      <LongName>101240 - Disclosure - Business Segments - Business Segment Net Sales and (Loss) Income from Operations Before Income Taxes (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureBusinessSegmentsBusinessSegmentNetSalesAndLossIncomeFromOperationsBeforeIncomeTaxesDetail</Role>
      <ShortName>Business Segments - Business Segment Net Sales and (Loss) Income from Operations Before Income Taxes (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>122</Position>
    </Report>
    <Report instance="ap-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R123.htm</HtmlFileName>
      <LongName>101250 - Disclosure - Business Segments - Business Segment Net Sales and (Loss) Income from Operations Before Income Taxes (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ampcopgh.com/20221231/taxonomy/role/Role_DisclosureBusinessSegmentsBusinessSegmentNetSalesAndLossIncomeFromOperationsBeforeIncomeTaxesParentheticalDetail</Role>
      <ShortName>Business Segments - Business Segment Net Sales and (Loss) Income from Operations Before Income Taxes (Parenthetical) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>123</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <Logs>
    <Log type="Warning">[dq-0542-Deprecated-Concept] Concept AccountsReceivableRelatedPartiesCurrent in us-gaap/2022 used in 1 facts was deprecated in us-gaap/2023 as of 2023 and should not be used. ap-20221231.htm 2158</Log>
    <Log type="Warning">[dq-0542-Deprecated-Concept] Concept AccountsPayableRelatedPartiesCurrent in us-gaap/2022 used in 2 facts was deprecated in us-gaap/2023 as of 2023 and should not be used. ap-20221231.htm 2350, 2354</Log>
    <Log type="Warning">[dq-0542-Deprecated-Concept] Concept RevenueFromRelatedParties in us-gaap/2022 used in 6 facts was deprecated in us-gaap/2023 as of 2023 and should not be used. ap-20221231.htm 2665, 2669, 13749</Log>
    <Log type="Warning">[dq-0542-Deprecated-Concept] Concept LondonInterbankOfferedRateLIBORMember in us-gaap/2022 used in 3 facts was deprecated in us-gaap/2023 as of 2023 and should not be used. ap-20221231.htm 7162</Log>
    <Log type="Warning">[dq-0542-Deprecated-Concept] Concept RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty in us-gaap/2022 used in 4 facts was deprecated in us-gaap/2023 as of 2023 and should not be used. ap-20221231.htm 13749</Log>
    <Log type="Warning">[dq-0542-Deprecated-Concept] Concept DueFromRelatedParties in us-gaap/2022 used in 3 facts was deprecated in us-gaap/2023 as of 2023 and should not be used. ap-20221231.htm 13749</Log>
    <Log type="Warning">[ix-0514-Hidden-Fact-Eligible-For-Transform] WARN: 2 fact(s) appearing in ix:hidden were eligible for transformation: dei:CurrentFiscalYearEndDate, dei:EntityRegistrantName -  ap-20221231.htm 8</Log>
  </Logs>
  <InputFiles>
    <File doctype="10-K" original="ap-20221231.htm">ap-20221231.htm</File>
    <File>ap-20221231.xsd</File>
    <File>ap-20221231_cal.xml</File>
    <File>ap-20221231_def.xml</File>
    <File>ap-20221231_lab.xml</File>
    <File>ap-20221231_pre.xml</File>
    <File>ap-ex18.htm</File>
    <File>ap-ex21.htm</File>
    <File>ap-ex23_1.htm</File>
    <File>ap-ex23_2.htm</File>
    <File>ap-ex31_1.htm</File>
    <File>ap-ex31_2.htm</File>
    <File>ap-ex32_1.htm</File>
    <File>ap-ex32_2.htm</File>
    <File>ap-ex3_3.htm</File>
    <File>ap-ex4_4.htm</File>
  </InputFiles>
  <SupplementalFiles>
    <File>img136350235_0.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="3">http://fasb.org/srt/2022</BaseTaxonomy>
    <BaseTaxonomy items="1781">http://fasb.org/us-gaap/2022</BaseTaxonomy>
    <BaseTaxonomy items="41">http://xbrl.sec.gov/dei/2022</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
