3.10.0.1 html 517 504 1 true 120 0 false 7 false false R1.htm 1001 - Document - Document and Entity Information Sheet http://apergy.com/taxonomy/role/DocumentandEntityInformation Document and Entity Information Cover 1 false false R2.htm 1003 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF INCOME Sheet http://apergy.com/taxonomy/role/StatementOfIncome CONDENSED CONSOLIDATED STATEMENTS OF INCOME Statements 2 false false R3.htm 1004 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Sheet http://apergy.com/taxonomy/role/StatementOfOtherComprehensiveIncome CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Statements 3 false false R4.htm 1005 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) Sheet http://apergy.com/taxonomy/role/StatementOfOtherComprehensiveIncomeParenthetical CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) Statements 4 false false R5.htm 1006 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS Sheet http://apergy.com/taxonomy/role/StatementOfFinancialPositionClassified CONDENSED CONSOLIDATED BALANCE SHEETS Statements 5 false false R6.htm 1007 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) Sheet http://apergy.com/taxonomy/role/StatementOfFinancialPositionClassifiedParenthetical CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) Statements 6 false false R7.htm 1008 - Statement - CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY Sheet http://apergy.com/taxonomy/role/StatementOfShareholdersEquityAndOtherComprehensiveIncome CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY Statements 7 false false R8.htm 1009 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS Sheet http://apergy.com/taxonomy/role/StatementOfCashFlowsIndirect CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS Statements 8 false false R9.htm 1010 - Disclosure - Basis of Presentation and Separation Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsOrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock Basis of Presentation and Separation Notes 9 false false R10.htm 1011 - Disclosure - New Accounting Standards Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock New Accounting Standards Notes 10 false false R11.htm 1012 - Disclosure - Related Party Transactions Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsRelatedPartyTransactionsDisclosureTextBlock Related Party Transactions Notes 11 false false R12.htm 1013 - Disclosure - Earnings Per Share Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsEarningsPerShareTextBlock Earnings Per Share Notes 12 false false R13.htm 1014 - Disclosure - Inventories Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsInventoryDisclosureTextBlock Inventories Notes 13 false false R14.htm 1015 - Disclosure - Property, Plant and Equipment Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsPropertyPlantAndEquipmentDisclosureTextBlock Property, Plant and Equipment Notes 14 false false R15.htm 1016 - Disclosure - Goodwill and Intangible Assets Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsGoodwillAndIntangibleAssetsDisclosureTextBlock Goodwill and Intangible Assets Notes 15 false false R16.htm 1017 - Disclosure - Debt Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsDebtDisclosureTextBlock Debt Notes 16 false false R17.htm 1018 - Disclosure - Accumulated Other Comprehensive Income (Loss) Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsComprehensiveIncomeNoteTextBlock Accumulated Other Comprehensive Income (Loss) Notes 17 false false R18.htm 1019 - Disclosure - Commitments and Contingencies Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsCommitmentsAndContingenciesDisclosureTextBlock Commitments and Contingencies Notes 18 false false R19.htm 1020 - Disclosure - Revenue Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsRevenueFromContractWithCustomerTextBlock Revenue Notes 19 false false R20.htm 1021 - Disclosure - Restructuring and Other Related Charges Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsRestructuringAndRelatedActivitiesDisclosureTextBlock Restructuring and Other Related Charges Notes 20 false false R21.htm 1022 - Disclosure - Income Taxes Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsIncomeTaxDisclosureTextBlock Income Taxes Notes 21 false false R22.htm 1023 - Disclosure - Fair Value Measurements Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsFairValueDisclosuresTextBlock Fair Value Measurements Notes 22 false false R23.htm 1024 - Disclosure - Equity and Cash Incentive Program Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock Equity and Cash Incentive Program Notes 23 false false R24.htm 1025 - Disclosure - Employee Benefit Plans and Non-Qualified Plans Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsPensionAndOtherPostretirementBenefitsDisclosureTextBlock Employee Benefit Plans and Non-Qualified Plans Notes 24 false false R25.htm 1026 - Disclosure - Segment Information Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsSegmentReportingDisclosureTextBlock Segment Information Notes 25 false false R26.htm 1027 - Disclosure - Condensed Consolidating Financial Information Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsCondensedFinancialStatementsTextBlock Condensed Consolidating Financial Information Notes 26 false false R27.htm 1028 - Disclosure - Summary of Significant Accounting Policies Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsSignificantAccountingPoliciesTextBlock Summary of Significant Accounting Policies Notes 27 false false R28.htm 1029 - Disclosure - Acquisitions Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsBusinessCombinationDisclosureTextBlock Acquisitions Notes 28 false false R29.htm 1030 - Disclosure - Other Accrued Expenses and Other Liabilities Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsAccountsPayableAndAccruedLiabilitiesDisclosureTextBlock Other Accrued Expenses and Other Liabilities Notes 29 false false R30.htm 1031 - Disclosure - Pro Forma Information (unaudited) Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsProFormaFinancialInformationTextBlock Pro Forma Information (unaudited) Notes 30 false false R31.htm 1032 - Disclosure - Subsequent Events Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsSubsequentEventsTextBlock Subsequent Events Notes 31 false false R32.htm 1033 - Disclosure - Quarterly Information (Unaudited) Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsQuarterlyFinancialInformationTextBlock Quarterly Information (Unaudited) Notes 32 false false R33.htm 1034 - Disclosure - Schedule II Valuation and Qualifying Accounts Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock Schedule II Valuation and Qualifying Accounts Notes 33 false false R34.htm 1035 - Disclosure - Basis of Presentation and Separation (Policies) Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsOrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlockPolicies Basis of Presentation and Separation (Policies) Policies http://apergy.com/taxonomy/role/NotesToFinancialStatementsNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock 34 false false R35.htm 1036 - Disclosure - Earnings Per Share (Tables) Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsEarningsPerShareTextBlockTables Earnings Per Share (Tables) Tables http://apergy.com/taxonomy/role/NotesToFinancialStatementsEarningsPerShareTextBlock 35 false false R36.htm 1037 - Disclosure - Inventories (Tables) Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsInventoryDisclosureTextBlockTables Inventories (Tables) Tables http://apergy.com/taxonomy/role/NotesToFinancialStatementsInventoryDisclosureTextBlock 36 false false R37.htm 1038 - Disclosure - Property, Plant and Equipment (Tables) Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsPropertyPlantAndEquipmentDisclosureTextBlockTables Property, Plant and Equipment (Tables) Tables http://apergy.com/taxonomy/role/NotesToFinancialStatementsPropertyPlantAndEquipmentDisclosureTextBlock 37 false false R38.htm 1039 - Disclosure - Goodwill and Intangible Assets (Tables) Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsGoodwillAndIntangibleAssetsDisclosureTextBlockTables Goodwill and Intangible Assets (Tables) Tables http://apergy.com/taxonomy/role/NotesToFinancialStatementsGoodwillAndIntangibleAssetsDisclosureTextBlock 38 false false R39.htm 1040 - Disclosure - Debt (Tables) Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsDebtDisclosureTextBlockTables Debt (Tables) Tables http://apergy.com/taxonomy/role/NotesToFinancialStatementsDebtDisclosureTextBlock 39 false false R40.htm 1041 - Disclosure - Accumulated Other Comprehensive Income (Loss) (Tables) Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsComprehensiveIncomeNoteTextBlockTables Accumulated Other Comprehensive Income (Loss) (Tables) Tables http://apergy.com/taxonomy/role/NotesToFinancialStatementsComprehensiveIncomeNoteTextBlock 40 false false R41.htm 1042 - Disclosure - Revenue (Tables) Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsRevenueFromContractWithCustomerTextBlockTables Revenue (Tables) Tables http://apergy.com/taxonomy/role/NotesToFinancialStatementsRevenueFromContractWithCustomerTextBlock 41 false false R42.htm 1043 - Disclosure - Restructuring and Other Related Charges (Tables) Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsRestructuringAndRelatedActivitiesDisclosureTextBlockTables Restructuring and Other Related Charges (Tables) Tables http://apergy.com/taxonomy/role/NotesToFinancialStatementsRestructuringAndRelatedActivitiesDisclosureTextBlock 42 false false R43.htm 1044 - Disclosure - Equity and Cash Incentive Program (Tables) Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlockTables Equity and Cash Incentive Program (Tables) Tables http://apergy.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock 43 false false R44.htm 1045 - Disclosure - Segment Information (Tables) Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsSegmentReportingDisclosureTextBlockTables Segment Information (Tables) Tables http://apergy.com/taxonomy/role/NotesToFinancialStatementsSegmentReportingDisclosureTextBlock 44 false false R45.htm 1046 - Disclosure - Condensed Consolidating Financial Information (Tables) Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsCondensedFinancialStatementsTextBlockTables Condensed Consolidating Financial Information (Tables) Tables http://apergy.com/taxonomy/role/NotesToFinancialStatementsCondensedFinancialStatementsTextBlock 45 false false R46.htm 1047 - Disclosure - Other Accrued Expenses and Other Liabilities (Tables) Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsAccountsPayableAndAccruedLiabilitiesDisclosureTextBlockTables Other Accrued Expenses and Other Liabilities (Tables) Tables http://apergy.com/taxonomy/role/NotesToFinancialStatementsAccountsPayableAndAccruedLiabilitiesDisclosureTextBlock 46 false false R47.htm 1048 - Disclosure - Income Taxes (Tables) Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsIncomeTaxDisclosureTextBlockTables Income Taxes (Tables) Tables http://apergy.com/taxonomy/role/NotesToFinancialStatementsIncomeTaxDisclosureTextBlock 47 false false R48.htm 1049 - Disclosure - Commitments and Contingencies (Tables) Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsCommitmentsAndContingenciesDisclosureTextBlockTables Commitments and Contingencies (Tables) Tables http://apergy.com/taxonomy/role/NotesToFinancialStatementsCommitmentsAndContingenciesDisclosureTextBlock 48 false false R49.htm 1050 - Disclosure - Employee Benefit Plans and Non-Qualified Plans (Tables) Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsPensionAndOtherPostretirementBenefitsDisclosureTextBlockTables Employee Benefit Plans and Non-Qualified Plans (Tables) Tables http://apergy.com/taxonomy/role/NotesToFinancialStatementsPensionAndOtherPostretirementBenefitsDisclosureTextBlock 49 false false R50.htm 1051 - Disclosure - Quarterly Information (Unaudited) (Tables) Sheet http://apergy.com/taxonomy/role/NotesToFinancialStatementsQuarterlyFinancialInformationTextBlockTables Quarterly Information (Unaudited) (Tables) Tables http://apergy.com/taxonomy/role/NotesToFinancialStatementsQuarterlyFinancialInformationTextBlock 50 false false R51.htm 1052 - Disclosure - Basis of Presentation and Separation Separation and Distribution (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureBasisOfPresentationAndSeparationSeparationAndDistribution Basis of Presentation and Separation Separation and Distribution (Detail) Details 51 false false R52.htm 1053 - Disclosure - Basis of Presentation and Separation Basis of Presentation (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureBasisOfPresentationAndSeparationBasisOfPresentation Basis of Presentation and Separation Basis of Presentation (Detail) Details 52 false false R53.htm 1054 - Disclosure - New Accounting Standards New Accounting Standards (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureNewAccountingStandardsNewAccountingStandards New Accounting Standards New Accounting Standards (Detail) Details 53 false false R54.htm 1055 - Disclosure - Related Party Transactions (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureRelatedPartyTransactions Related Party Transactions (Detail) Details http://apergy.com/taxonomy/role/NotesToFinancialStatementsRelatedPartyTransactionsDisclosureTextBlock 54 false false R55.htm 1056 - Disclosure - Earnings per Share (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureEarningsPerShare Earnings per Share (Detail) Details 55 false false R56.htm 1057 - Disclosure - Inventories (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureInventories Inventories (Detail) Details http://apergy.com/taxonomy/role/NotesToFinancialStatementsInventoryDisclosureTextBlockTables 56 false false R57.htm 1058 - Disclosure - Property, Plant and Equipment (Detail) Sheet http://apergy.com/taxonomy/role/DisclosurePropertyPlantAndEquipment Property, Plant and Equipment (Detail) Details http://apergy.com/taxonomy/role/NotesToFinancialStatementsPropertyPlantAndEquipmentDisclosureTextBlockTables 57 false false R58.htm 1059 - Disclosure - Goodwill and Intangible Assets - Goodwill (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsGoodwill Goodwill and Intangible Assets - Goodwill (Detail) Details 58 false false R59.htm 1060 - Disclosure - Goodwill and Intangible Assets - Intangible Assets and Amortization Expense (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsIntangibleAssetsAndAmortizationExpense Goodwill and Intangible Assets - Intangible Assets and Amortization Expense (Detail) Details 59 false false R60.htm 1061 - Disclosure - Debt - Long-term Debt (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureDebtLongtermDebt Debt - Long-term Debt (Detail) Details 60 false false R61.htm 1062 - Disclosure - Debt (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureDebt Debt (Detail) Details http://apergy.com/taxonomy/role/NotesToFinancialStatementsDebtDisclosureTextBlockTables 61 false false R62.htm 1063 - Disclosure - Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureAccumulatedOtherComprehensiveLossScheduleOfAccumulatedOtherComprehensiveLoss Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss (Detail) Details 62 false false R63.htm 1064 - Disclosure - Accumulated Other Comprehensive Loss - Reclassification Out of Accumulated Other Comprehensive Loss (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureAccumulatedOtherComprehensiveLossReclassificationOutOfAccumulatedOtherComprehensiveLoss Accumulated Other Comprehensive Loss - Reclassification Out of Accumulated Other Comprehensive Loss (Detail) Details 63 false false R64.htm 1065 - Disclosure - Commitments and Contingencies (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureCommitmentsAndContingencies Commitments and Contingencies (Detail) Details http://apergy.com/taxonomy/role/NotesToFinancialStatementsCommitmentsAndContingenciesDisclosureTextBlockTables 64 false false R65.htm 1066 - Disclosure - Revenue - Narrative (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureRevenueNarrative Revenue - Narrative (Detail) Details 65 false false R66.htm 1067 - Disclosure - Revenue - Disaggregation of Revenue (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureRevenueDisaggregationOfRevenue Revenue - Disaggregation of Revenue (Detail) Details 66 false false R67.htm 1068 - Disclosure - Revenue - Contract Balances (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureRevenueContractBalances Revenue - Contract Balances (Detail) Details 67 false false R68.htm 1069 - Disclosure - Restructuring and Other Related Charges (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureRestructuringAndOtherRelatedCharges Restructuring and Other Related Charges (Detail) Details http://apergy.com/taxonomy/role/NotesToFinancialStatementsRestructuringAndRelatedActivitiesDisclosureTextBlockTables 68 false false R69.htm 1070 - Disclosure - Restructuring and Other Related Charges - Narrative (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureRestructuringAndOtherRelatedChargesNarrative Restructuring and Other Related Charges - Narrative (Detail) Details 69 false false R70.htm 1071 - Disclosure - Income Taxes (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureIncomeTaxes Income Taxes (Detail) Details http://apergy.com/taxonomy/role/NotesToFinancialStatementsIncomeTaxDisclosureTextBlockTables 70 false false R71.htm 1072 - Disclosure - Fair Value Measurements (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureFairValueMeasurements Fair Value Measurements (Detail) Details http://apergy.com/taxonomy/role/NotesToFinancialStatementsFairValueDisclosuresTextBlock 71 false false R72.htm 1073 - Disclosure - Equity and Cash Incentive Program - Narrative (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureEquityAndCashIncentiveProgramNarrative Equity and Cash Incentive Program - Narrative (Detail) Details 72 false false R73.htm 1074 - Disclosure - Equity and Cash Incentive Program - Share-based Compensation Expense Relating to All Stock-Based Incentive Plans (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureEquityAndCashIncentiveProgramSharebasedCompensationExpenseRelatingToAllStockBasedIncentivePlans Equity and Cash Incentive Program - Share-based Compensation Expense Relating to All Stock-Based Incentive Plans (Detail) Details 73 false false R74.htm 1075 - Disclosure - Employee Benefit Plans - Narrative (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureEmployeeBenefitPlansNarrative Employee Benefit Plans - Narrative (Detail) Details 74 false false R75.htm 1076 - Disclosure - Segment Information (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureSegmentInformation Segment Information (Detail) Details http://apergy.com/taxonomy/role/NotesToFinancialStatementsSegmentReportingDisclosureTextBlockTables 75 false false R76.htm 1077 - Disclosure - Condensed Consolidating Financial Information - Additional Information (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureCondensedConsolidatingFinancialInformationAdditionalInformation Condensed Consolidating Financial Information - Additional Information (Detail) Details 76 false false R77.htm 1078 - Disclosure - Condensed Consolidating Financial Information - Schedule of Condensed Statements of Income (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureCondensedConsolidatingFinancialInformationScheduleOfCondensedStatementsOfIncome Condensed Consolidating Financial Information - Schedule of Condensed Statements of Income (Detail) Details 77 false false R78.htm 1079 - Disclosure - Condensed Consolidating Financial Information - Schedule of Condensed Balance Sheets (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureCondensedConsolidatingFinancialInformationScheduleOfCondensedBalanceSheets Condensed Consolidating Financial Information - Schedule of Condensed Balance Sheets (Detail) Details 78 false false R79.htm 1080 - Disclosure - Condensed Consolidating Financial Information - Schedule of Condensed Statements of Cash Flows (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureCondensedConsolidatingFinancialInformationScheduleOfCondensedStatementsOfCashFlows Condensed Consolidating Financial Information - Schedule of Condensed Statements of Cash Flows (Detail) Details 79 false false R80.htm 1081 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformation Summary of Significant Accounting Policies - Additional Information (Detail) Details 80 false false R81.htm 1082 - Disclosure - Acquisitions - Additional Information (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureAcquisitionsAdditionalInformation Acquisitions - Additional Information (Detail) Details 81 false false R82.htm 1083 - Disclosure - Inventories - Additional Information (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureInventoriesAdditionalInformation Inventories - Additional Information (Detail) Details 82 false false R83.htm 1084 - Disclosure - Goodwill and Other Intangible Assets - Additional Information (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsAdditionalInformation Goodwill and Other Intangible Assets - Additional Information (Detail) Details 83 false false R84.htm 1085 - Disclosure - Goodwill and Other Intangible Assets - Estimated Future Amortization Expense related to Intangible Assets (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsEstimatedFutureAmortizationExpenseRelatedToIntangibleAssets Goodwill and Other Intangible Assets - Estimated Future Amortization Expense related to Intangible Assets (Detail) Details 84 false false R85.htm 1086 - Disclosure - Other Accrued Expenses and Other Liabilities - Components of Other Accrued Expenses (Current) (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureOtherAccruedExpensesAndOtherLiabilitiesComponentsOfOtherAccruedExpensesCurrent Other Accrued Expenses and Other Liabilities - Components of Other Accrued Expenses (Current) (Detail) Details 85 false false R86.htm 1087 - Disclosure - Other Accrued Expenses and Other Liabilities - Components of Other Liabilities (Noncurrent) (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureOtherAccruedExpensesAndOtherLiabilitiesComponentsOfOtherLiabilitiesNoncurrent Other Accrued Expenses and Other Liabilities - Components of Other Liabilities (Noncurrent) (Detail) Details 86 false false R87.htm 1088 - Disclosure - Other Accrued Expenses and Other Liabilities - Carrying Amount of Product Warranties (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureOtherAccruedExpensesAndOtherLiabilitiesCarryingAmountOfProductWarranties Other Accrued Expenses and Other Liabilities - Carrying Amount of Product Warranties (Detail) Details 87 false false R88.htm 1089 - Disclosure - Restructuring Activities - Restructuring and Other Related Charges (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureRestructuringActivitiesRestructuringAndOtherRelatedCharges Restructuring Activities - Restructuring and Other Related Charges (Detail) Details 88 false false R89.htm 1090 - Disclosure - Restructuring Activities - Company's Severance and Other Restructuring Accrual Activities (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureRestructuringActivitiesCompanysSeveranceAndOtherRestructuringAccrualActivities Restructuring Activities - Company's Severance and Other Restructuring Accrual Activities (Detail) Details 89 false false R90.htm 1091 - Disclosure - Income Taxes - Schedule of Income before Income Tax, Domestic and Foreign (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureIncomeTaxesScheduleOfIncomeBeforeIncomeTaxDomesticAndForeign Income Taxes - Schedule of Income before Income Tax, Domestic and Foreign (Detail) Details 90 false false R91.htm 1092 - Disclosure - Income Taxes - Schedule of Components of Income Tax Expense (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureIncomeTaxesScheduleOfComponentsOfIncomeTaxExpense Income Taxes - Schedule of Components of Income Tax Expense (Detail) Details 91 false false R92.htm 1093 - Disclosure - Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureIncomeTaxesScheduleOfEffectiveIncomeTaxRateReconciliation Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail) Details 92 false false R93.htm 1094 - Disclosure - Income Taxes - Schedule of Future Deferred Tax Assets and Liabilities (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureIncomeTaxesScheduleOfFutureDeferredTaxAssetsAndLiabilities Income Taxes - Schedule of Future Deferred Tax Assets and Liabilities (Detail) Details 93 false false R94.htm 1095 - Disclosure - Equity and Cash Incentive Program - Black Scholes Option-Pricing Model (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureEquityAndCashIncentiveProgramBlackScholesOptionPricingModel Equity and Cash Incentive Program - Black Scholes Option-Pricing Model (Detail) Details 94 false false R95.htm 1096 - Disclosure - Equity and Cash Incentive Program - Summary of Activity Relating to SARs (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureEquityAndCashIncentiveProgramSummaryOfActivityRelatingToSARs Equity and Cash Incentive Program - Summary of Activity Relating to SARs (Detail) Details 95 false false R96.htm 1097 - Disclosure - Equity And Cash Incentive Program - Summary of Outstanding and Exercisable SARs (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureEquityAndCashIncentiveProgramSummaryOfOutstandingAndExercisableSARs Equity And Cash Incentive Program - Summary of Outstanding and Exercisable SARs (Detail) Details 96 false false R97.htm 1098 - Disclosure - Equity and Cash Incentive Program - Other Information Regarding Exercise of SARs and Stock Options (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureEquityAndCashIncentiveProgramOtherInformationRegardingExerciseOfSARsAndStockOptions Equity and Cash Incentive Program - Other Information Regarding Exercise of SARs and Stock Options (Detail) Details 97 false false R98.htm 1099 - Disclosure - Equity and Cash Incentive Program - Fair Value Used in Determining Compensation Cost of Performance Shares (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureEquityAndCashIncentiveProgramFairValueUsedInDeterminingCompensationCostOfPerformanceShares Equity and Cash Incentive Program - Fair Value Used in Determining Compensation Cost of Performance Shares (Detail) Details 98 false false R99.htm 1100 - Disclosure - Equity and Cash Incentive Program - Summary of Activity for Performance Share Awards (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureEquityAndCashIncentiveProgramSummaryOfActivityForPerformanceShareAwards Equity and Cash Incentive Program - Summary of Activity for Performance Share Awards (Detail) Details 99 false false R100.htm 1101 - Disclosure - Equity and Cash Incentive Program - Summary of activity for restricted stock units (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureEquityAndCashIncentiveProgramSummaryOfActivityForRestrictedStockUnits Equity and Cash Incentive Program - Summary of activity for restricted stock units (Detail) Details 100 false false R101.htm 1102 - Disclosure - Commitments and Contingent Liabilities - Operating And Capital Leases (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureCommitmentsAndContingentLiabilitiesOperatingAndCapitalLeases Commitments and Contingent Liabilities - Operating And Capital Leases (Detail) Details 101 false false R102.htm 1103 - Disclosure - Employee Benefit Plans And Non-Qualified Plans - Summary of Expenses Recorded in the Financial Statements (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureEmployeeBenefitPlansAndNonQualifiedPlansSummaryOfExpensesRecordedInTheFinancialStatements Employee Benefit Plans And Non-Qualified Plans - Summary of Expenses Recorded in the Financial Statements (Detail) Details 102 false false R103.htm 1104 - Disclosure - Employee Benefit Plans and Non-Qualified Plans - Summary of Combined Balance Sheets Impact Associated with the Company's Single Employer Defined Benefit Plans (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureEmployeeBenefitPlansAndNonQualifiedPlansSummaryOfCombinedBalanceSheetsImpactAssociatedWithTheCompanysSingleEmployerDefinedBenefitPlans Employee Benefit Plans and Non-Qualified Plans - Summary of Combined Balance Sheets Impact Associated with the Company's Single Employer Defined Benefit Plans (Detail) Details 103 false false R104.htm 1105 - Disclosure - Employee Benefit Plans and Non-Qualified Plans - Summary of Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureEmployeeBenefitPlansAndNonQualifiedPlansSummaryOfPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssets Employee Benefit Plans and Non-Qualified Plans - Summary of Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets (Detail) Details 104 false false R105.htm 1106 - Disclosure - Employee Benefit Plans and Non-Qualified Plans - Components of the Net Periodic Benefit Cost (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureEmployeeBenefitPlansAndNonQualifiedPlansComponentsOfTheNetPeriodicBenefitCost Employee Benefit Plans and Non-Qualified Plans - Components of the Net Periodic Benefit Cost (Detail) Details 105 false false R106.htm 1107 - Disclosure - Employee Benefit Plans and Non-Qualified Plans - Schedule of Amounts Expected to be Amortized from Accumulated Other Comprehensive Income (loss) into Net Periodic Benefit Cost (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureEmployeeBenefitPlansAndNonQualifiedPlansScheduleOfAmountsExpectedToBeAmortizedFromAccumulatedOtherComprehensiveIncomelossIntoNetPeriodicBenefitCost Employee Benefit Plans and Non-Qualified Plans - Schedule of Amounts Expected to be Amortized from Accumulated Other Comprehensive Income (loss) into Net Periodic Benefit Cost (Detail) Details 106 false false R107.htm 1108 - Disclosure - Employee Benefit Plans and Non-Qualified Plans - Weighted Average Assumptions Used in Determining the Benefit Obligations (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureEmployeeBenefitPlansAndNonQualifiedPlansWeightedAverageAssumptionsUsedInDeterminingTheBenefitObligations Employee Benefit Plans and Non-Qualified Plans - Weighted Average Assumptions Used in Determining the Benefit Obligations (Detail) Details 107 false false R108.htm 1109 - Disclosure - Employee Benefit Plans and Non-Qualified Plans - Weighted Average Assumptions Used in Determining the Net Periodic Benefit Cost (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureEmployeeBenefitPlansAndNonQualifiedPlansWeightedAverageAssumptionsUsedInDeterminingTheNetPeriodicBenefitCost Employee Benefit Plans and Non-Qualified Plans - Weighted Average Assumptions Used in Determining the Net Periodic Benefit Cost (Detail) Details 108 false false R109.htm 1110 - Disclosure - Employee Benefit Plans and Non-Qualified Plans - Actual and Target Weighted Average Asset Allocation (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureEmployeeBenefitPlansAndNonQualifiedPlansActualAndTargetWeightedAverageAssetAllocation Employee Benefit Plans and Non-Qualified Plans - Actual and Target Weighted Average Asset Allocation (Detail) Details 109 false false R110.htm 1111 - Disclosure - Employee Benefit Plans and Non-Qualified Plans - Fair Values of Pension Plan Assets by Asset Category within the Fair Value Hierarchy (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureEmployeeBenefitPlansAndNonQualifiedPlansFairValuesOfPensionPlanAssetsByAssetCategoryWithinTheFairValueHierarchy Employee Benefit Plans and Non-Qualified Plans - Fair Values of Pension Plan Assets by Asset Category within the Fair Value Hierarchy (Detail) Details 110 false false R111.htm 1112 - Disclosure - Employee Benefit Plans and Non-Qualified Plans - Estimated Future Benefit Payments to Retirees (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureEmployeeBenefitPlansAndNonQualifiedPlansEstimatedFutureBenefitPaymentsToRetirees Employee Benefit Plans and Non-Qualified Plans - Estimated Future Benefit Payments to Retirees (Detail) Details 111 false false R112.htm 1113 - Disclosure - Other Comprehensive Income (Loss) - Schedule of Amounts Recognized in Other Comprehensive Income (Loss) (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureOtherComprehensiveIncomeLossScheduleOfAmountsRecognizedInOtherComprehensiveIncomeLoss Other Comprehensive Income (Loss) - Schedule of Amounts Recognized in Other Comprehensive Income (Loss) (Detail) Details 112 false false R113.htm 1114 - Disclosure - Other Comprehensive Income (Loss) - Schedule of Comprehensive Income (Loss) (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureOtherComprehensiveIncomeLossScheduleOfComprehensiveIncomeLoss Other Comprehensive Income (Loss) - Schedule of Comprehensive Income (Loss) (Detail) Details 113 false false R114.htm 1115 - Disclosure - Segment Information - Additional Information (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureSegmentInformationAdditionalInformation Segment Information - Additional Information (Detail) Details 114 false false R115.htm 1116 - Disclosure - Segment Information (Parenthetical) (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureSegmentInformationParenthetical Segment Information (Parenthetical) (Detail) Details http://apergy.com/taxonomy/role/NotesToFinancialStatementsSegmentReportingDisclosureTextBlockTables 115 false false R116.htm 1117 - Disclosure - Segment Information - Revenue Classified by Significant Products and Services (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureSegmentInformationRevenueClassifiedBySignificantProductsAndServices Segment Information - Revenue Classified by Significant Products and Services (Detail) Details 116 false false R117.htm 1118 - Disclosure - Segment Information - Information Concerning Principal Geographic Areas (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureSegmentInformationInformationConcerningPrincipalGeographicAreas Segment Information - Information Concerning Principal Geographic Areas (Detail) Details 117 false false R118.htm 1119 - Disclosure - Pro Forma Information (unaudited) - Additional Information (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureProFormaInformationunauditedAdditionalInformation Pro Forma Information (unaudited) - Additional Information (Detail) Details http://apergy.com/taxonomy/role/NotesToFinancialStatementsProFormaFinancialInformationTextBlock 118 false false R119.htm 1120 - Disclosure - Subsequent Events - Additional Information (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureSubsequentEventsAdditionalInformation Subsequent Events - Additional Information (Detail) Details 119 false false R120.htm 1121 - Disclosure - Quarterly Information - Business Information Segment (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureQuarterlyInformationBusinessInformationSegment Quarterly Information - Business Information Segment (Detail) Details 120 false false R121.htm 1122 - Disclosure - Quarterly Information - Business Information Segment (Parenthetical) (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureQuarterlyInformationBusinessInformationSegmentParenthetical Quarterly Information - Business Information Segment (Parenthetical) (Detail) Details 121 false false R122.htm 1123 - Disclosure - Schedule II - Schedule Of Valuation and Qualifying Accounts (Detail) Sheet http://apergy.com/taxonomy/role/DisclosureScheduleIIScheduleOfValuationAndQualifyingAccounts Schedule II - Schedule Of Valuation and Qualifying Accounts (Detail) Details 122 false false All Reports Book All Reports apy-20180930.xml apy-20180930.xsd apy-20180930_cal.xml apy-20180930_def.xml apy-20180930_lab.xml apy-20180930_pre.xml http://xbrl.sec.gov/dei/2018-01-31 http://fasb.org/srt/2018-01-31 http://xbrl.sec.gov/country/2017-01-31 http://fasb.org/us-gaap/2018-01-31 true true