3.25.1 html 611 686 1 true 143 0 false 12 false false R1.htm 100000 - Document - Document and Entity Information Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 100010 - Statement - Consolidated Balance Sheets Sheet http://www.adtran.com/20241231/taxonomy/role/Role_StatementConsolidatedBalanceSheets Consolidated Balance Sheets Statements 2 false false R3.htm 100060 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_StatementConsolidatedBalanceSheetsParenthetical Consolidated Balance Sheets (Parenthetical) Statements 3 false false R4.htm 100070 - Statement - Consolidated Statements of Loss Sheet http://www.adtran.com/20241231/taxonomy/role/StatementConsolidatedStatementsOfLoss Consolidated Statements of Loss Statements 4 false false R5.htm 100080 - Statement - Consolidated Statements of Loss (Parenthetical) Sheet http://www.adtran.com/20241231/taxonomy/role/StatementConsolidatedStatementsOfLossParenthetical Consolidated Statements of Loss (Parenthetical) Statements 5 false false R6.htm 100090 - Statement - Consolidated Statements of Comprehensive (Loss) Income Sheet http://www.adtran.com/20241231/taxonomy/role/StatementConsolidatedStatementsOfComprehensiveLossIncome Consolidated Statements of Comprehensive (Loss) Income Statements 6 false false R7.htm 100100 - Statement - Consolidated Statements of Changes in Equity Sheet http://www.adtran.com/20241231/taxonomy/role/StatementConsolidatedStatementsOfChangesInEquity1 Consolidated Statements of Changes in Equity Statements 7 false false R8.htm 100110 - Statement - Consolidated Statements of Changes in Equity (Parenthetical) Sheet http://www.adtran.com/20241231/taxonomy/role/StatementConsolidatedStatementsOfChangesInEquityParenthetical Consolidated Statements of Changes in Equity (Parenthetical) Statements 8 false false R9.htm 100120 - Statement - Consolidated Statements of Cash Flows Sheet http://www.adtran.com/20241231/taxonomy/role/Role_StatementConsolidatedStatementsOfCashFlows Consolidated Statements of Cash Flows Statements 9 false false R10.htm 995410 - Disclosure - Pay vs Performance Disclosure Sheet http://xbrl.sec.gov/ecd/role/PvpDisclosure Pay vs Performance Disclosure Notes 10 false false R11.htm 995440 - Disclosure - Recovery of Erroneously Awarded Compensation Sheet http://xbrl.sec.gov/ecd/role/ErrCompDisclosure Recovery of Erroneously Awarded Compensation Notes 11 false false R12.htm 995445 - Disclosure - Insider Trading Arrangements Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements Insider Trading Arrangements Notes 12 false false R13.htm 995447 - Disclosure - Insider Trading Policies and Procedures Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc Insider Trading Policies and Procedures Notes 13 false false R14.htm 995450 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPolicies1 Summary of Significant Accounting Policies Notes 14 false false R15.htm 995457 - Disclosure - Cybersecurity Risk Management, Strategy and Governance Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureCybersecurityRiskManagementStrategyAndGovernance Cybersecurity Risk Management, Strategy and Governance Notes 15 false false R16.htm 995460 - Disclosure - Revenue Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureRevenue Revenue Notes 16 false false R17.htm 995470 - Disclosure - Stock-Based Compensation Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureStockBasedCompensation Stock-Based Compensation Notes 17 false false R18.htm 995480 - Disclosure - Investments Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureInvestments Investments Notes 18 false false R19.htm 995490 - Disclosure - Inventory Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureInventory Inventory Notes 19 false false R20.htm 995500 - Disclosure - Property, Plant and Equipment Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosurePropertyPlantAndEquipment Property, Plant and Equipment Notes 20 false false R21.htm 995510 - Disclosure - Leases Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureLeases Leases Notes 21 false false R22.htm 995520 - Disclosure - Goodwill Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureGoodwill Goodwill Notes 22 false false R23.htm 995530 - Disclosure - Intangible Assets Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureIntangibleAssets Intangible Assets Notes 23 false false R24.htm 995540 - Disclosure - Hedging Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureHedging1 Hedging Notes 24 false false R25.htm 995550 - Disclosure - Credit Agreements Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureCreditAgreements Credit Agreements Notes 25 false false R26.htm 995560 - Disclosure - Income Taxes Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureIncomeTaxes Income Taxes Notes 26 false false R27.htm 995570 - Disclosure - Employee Benefit Plans Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureEmployeeBenefitPlans Employee Benefit Plans Notes 27 false false R28.htm 995580 - Disclosure - Equity Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureEquity Equity Notes 28 false false R29.htm 995590 - Disclosure - Redeemable Non-controlling Interest Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureRedeemableNoncontrollingInterest Redeemable Non-controlling Interest Notes 29 false false R30.htm 995600 - Disclosure - Segment Information and Major Customers Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureSegmentInformationAndMajorCustomers Segment Information and Major Customers Notes 30 false false R31.htm 995610 - Disclosure - Liability for Warranty Returns Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureLiabilityForWarrantyReturns1 Liability for Warranty Returns Notes 31 false false R32.htm 995620 - Disclosure - Commitments and Contingencies Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureCommitmentsAndContingencies Commitments and Contingencies Notes 32 false false R33.htm 995630 - Disclosure - Loss per Share Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureLossPerShare Loss per Share Notes 33 false false R34.htm 995640 - Disclosure - Restructuring Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureRestructuring Restructuring Notes 34 false false R35.htm 995650 - Disclosure - Current Expected Credit Losses Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureCurrentExpectedCreditLosses Current Expected Credit Losses Notes 35 false false R36.htm 995660 - Disclosure - Restatement of Quarterly Financial Information (Unaudited) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureRestatementOfQuarterlyFinancialInformationUnaudited Restatement of Quarterly Financial Information (Unaudited) Notes 36 false false R37.htm 995670 - Disclosure - Subsequent Events Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureSubsequentEvents Subsequent Events Notes 37 false false R38.htm 995680 - Disclosure - Schedule II - Valuation and Qualifying Accounts Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureScheduleIIValuationAndQualifyingAccounts Schedule II - Valuation and Qualifying Accounts Notes 38 false false R39.htm 995690 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Policies http://www.adtran.com/20241231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPolicies1 39 false false R40.htm 995700 - Disclosure - Summary of Significant Accounting Policies (Tables) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesTables Summary of Significant Accounting Policies (Tables) Tables http://www.adtran.com/20241231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPolicies1 40 false false R41.htm 995710 - Disclosure - Revenue (Tables) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureRevenueTables Revenue (Tables) Tables http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureRevenue 41 false false R42.htm 995720 - Disclosure - Stock-Based Compensation (Tables) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureStockBasedCompensationTables Stock-Based Compensation (Tables) Tables http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureStockBasedCompensation 42 false false R43.htm 995730 - Disclosure - Investments (Tables) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureInvestmentsTables Investments (Tables) Tables http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureInvestments 43 false false R44.htm 995740 - Disclosure - Inventory (Tables) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureInventoryTables Inventory (Tables) Tables http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureInventory 44 false false R45.htm 995750 - Disclosure - Property, Plant and Equipment (Tables) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosurePropertyPlantAndEquipmentTables Property, Plant and Equipment (Tables) Tables http://www.adtran.com/20241231/taxonomy/role/Role_DisclosurePropertyPlantAndEquipment 45 false false R46.htm 995760 - Disclosure - Leases (Tables) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureLeasesTables Leases (Tables) Tables http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureLeases 46 false false R47.htm 995770 - Disclosure - Goodwill (Tables) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureGoodwillTables Goodwill (Tables) Tables http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureGoodwill 47 false false R48.htm 995780 - Disclosure - Intangible Assets (Tables) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureIntangibleAssetsTables Intangible Assets (Tables) Tables http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureIntangibleAssets 48 false false R49.htm 995790 - Disclosure - Hedging (Tables) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureHedgingTables Hedging (Tables) Tables http://www.adtran.com/20241231/taxonomy/role/DisclosureHedging1 49 false false R50.htm 995800 - Disclosure - Credit Agreements (Tables) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureCreditAgreementsTables Credit Agreements (Tables) Tables http://www.adtran.com/20241231/taxonomy/role/DisclosureCreditAgreements 50 false false R51.htm 995810 - Disclosure - Income Taxes (Tables) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureIncomeTaxesTables Income Taxes (Tables) Tables http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureIncomeTaxes 51 false false R52.htm 995820 - Disclosure - Employee Benefit Plans (Tables) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansTables Employee Benefit Plans (Tables) Tables http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureEmployeeBenefitPlans 52 false false R53.htm 995830 - Disclosure - Equity (Tables) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureEquityTables Equity (Tables) Tables http://www.adtran.com/20241231/taxonomy/role/DisclosureEquity 53 false false R54.htm 995840 - Disclosure - Redeemable Non-controlling Interest (Tables) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureRedeemableNoncontrollingInterestTables Redeemable Non-controlling Interest (Tables) Tables http://www.adtran.com/20241231/taxonomy/role/DisclosureRedeemableNoncontrollingInterest 54 false false R55.htm 995850 - Disclosure - Segment Information and Major Customers (Tables) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureSegmentInformationAndMajorCustomersTables Segment Information and Major Customers (Tables) Tables http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureSegmentInformationAndMajorCustomers 55 false false R56.htm 995860 - Disclosure - Liability for Warranty Returns (Tables) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureLiabilityForWarrantyReturnsTables Liability for Warranty Returns (Tables) Tables http://www.adtran.com/20241231/taxonomy/role/DisclosureLiabilityForWarrantyReturns1 56 false false R57.htm 995870 - Disclosure - Loss per Share (Tables) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureLossPerShareTables Loss per Share (Tables) Tables http://www.adtran.com/20241231/taxonomy/role/DisclosureLossPerShare 57 false false R58.htm 995880 - Disclosure - Restructuring (Tables) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureRestructuringTables Restructuring (Tables) Tables http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureRestructuring 58 false false R59.htm 995890 - Disclosure - Restatement of Quarterly Financial Information (Unaudited) (Tables) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureRestatementOfQuarterlyFinancialInformationUnauditedTables Restatement of Quarterly Financial Information (Unaudited) (Tables) Tables http://www.adtran.com/20241231/taxonomy/role/DisclosureRestatementOfQuarterlyFinancialInformationUnaudited 59 false false R60.htm 995900 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetail Summary of Significant Accounting Policies - Additional Information (Detail) Details 60 false false R61.htm 995910 - Disclosure - Summary of Significant Accounting Policies - Accounts Receivable - Additional Information (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAccountsReceivableAdditionalInformationDetail Summary of Significant Accounting Policies - Accounts Receivable - Additional Information (Detail) Details 61 false false R62.htm 995920 - Disclosure - Summary of Significant Accounting Policies - Summary of Impact of Restatement to Specific Line Items in Consolidated Balance Sheets (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesSummaryOfImpactOfRestatementToSpecificLineItemsInConsolidatedBalanceSheetsDetail Summary of Significant Accounting Policies - Summary of Impact of Restatement to Specific Line Items in Consolidated Balance Sheets (Detail) Details 62 false false R63.htm 995930 - Disclosure - Summary of Significant Accounting Policies - Summary of Impact of Restatement to Specific Line Items in Consolidated Balance Sheets (Parenthetical) (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesSummaryOfImpactOfRestatementToSpecificLineItemsInConsolidatedBalanceSheetsParentheticalDet Summary of Significant Accounting Policies - Summary of Impact of Restatement to Specific Line Items in Consolidated Balance Sheets (Parenthetical) (Detail) Details 63 false false R64.htm 995940 - Disclosure - Summary of Significant Accounting Policies - Summary of Impact of Restatement to Specific Line Items in Consolidated Statement of Loss and the Consolidated Statement of Comprehensive Loss (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesSummaryOfImpactOfRestatementToSpecificLineItemsInConsolidatedStatementOfLossAndTheConsol2 Summary of Significant Accounting Policies - Summary of Impact of Restatement to Specific Line Items in Consolidated Statement of Loss and the Consolidated Statement of Comprehensive Loss (Detail) Details 64 false false R65.htm 995950 - Disclosure - Summary of Significant Accounting Policies - Summary of Impact of Restatement to Specific Line Items in Consolidated Statement of Loss and the Consolidated Statement of Comprehensive Loss (Parenthetical) (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesSummaryOfImpactOfRestatementToSpecificLineItemsInConsolidatedStatementOfLossAndTheConsol4 Summary of Significant Accounting Policies - Summary of Impact of Restatement to Specific Line Items in Consolidated Statement of Loss and the Consolidated Statement of Comprehensive Loss (Parenthetical) (Detail) Details 65 false false R66.htm 995960 - Disclosure - Summary of Significant Accounting Policies - Summary of Impact of Restatement to Specific Line Items in Consolidated Statement of Changes in Stockholders Equity (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesSummaryOfImpactOfRestatementToSpecificLineItemsInConsolidatedStatementOfChangesInStockhol Summary of Significant Accounting Policies - Summary of Impact of Restatement to Specific Line Items in Consolidated Statement of Changes in Stockholders Equity (Detail) Details 66 false false R67.htm 995970 - Disclosure - Summary of Significant Accounting Policies - Summary of Impact of Restatement to Specific Line Items in Consolidated Statement of Changes in Stockholders Equity (Parenthetical) (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesSummaryOfImpactOfRestatementToSpecificLineItemsInConsolidatedStatementOfChangesInStockhol1 Summary of Significant Accounting Policies - Summary of Impact of Restatement to Specific Line Items in Consolidated Statement of Changes in Stockholders Equity (Parenthetical) (Detail) Details 67 false false R68.htm 995980 - Disclosure - Summary of Significant Accounting Policies - Summary of Impact of Restatement to Specific Line Items in Consolidated Statements of Cash Flows (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesSummaryOfImpactOfRestatementToSpecificLineItemsInConsolidatedStatementsOfCashFlowsDetail Summary of Significant Accounting Policies - Summary of Impact of Restatement to Specific Line Items in Consolidated Statements of Cash Flows (Detail) Details 68 false false R69.htm 995990 - Disclosure - Revenue - Additional Information (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureRevenueAdditionalInformationDetail Revenue - Additional Information (Detail) Details 69 false false R70.htm 996000 - Disclosure - Revenue - Disaggregate of Revenue by Reportable Segment and Revenue Category (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureRevenueDisaggregateOfRevenueByReportableSegmentAndRevenueCategoryDetail Revenue - Disaggregate of Revenue by Reportable Segment and Revenue Category (Detail) Details 70 false false R71.htm 996010 - Disclosure - Revenue - Additional Information (Detail1) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureRevenueAdditionalInformationDetail1 Revenue - Additional Information (Detail1) Details 71 false false R72.htm 996020 - Disclosure - Revenue - Information about Receivable, Contract Assets, and Unearned Revenue from Contracts with Customers (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureRevenueInformationAboutReceivableContractAssetsAndUnearnedRevenueFromContractsWithCustomersDetail Revenue - Information about Receivable, Contract Assets, and Unearned Revenue from Contracts with Customers (Detail) Details 72 false false R73.htm 996030 - Disclosure - Stock-Based Compensation (Stock Incentive Program Descriptions) - Additional Information (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureStockbasedCompensationStockIncentiveProgramDescriptionsAdditionalInformationDetail Stock-Based Compensation (Stock Incentive Program Descriptions) - Additional Information (Detail) Details http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureStockBasedCompensationTables 73 false false R74.htm 996040 - Disclosure - Stock-Based Compensation - Stock-Based Compensation Expense Related to Stock Options, PSUs, RSUs and Restricted Stock (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureStockBasedCompensationStockBasedCompensationExpenseRelatedToStockOptionsPsusRsusAndRestrictedStockDetail Stock-Based Compensation - Stock-Based Compensation Expense Related to Stock Options, PSUs, RSUs and Restricted Stock (Detail) Details 74 false false R75.htm 996050 - Disclosure - Stock-Based Compensation - Summary of PSUs, RSUs and Restricted Stock Outstanding (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureStockBasedCompensationSummaryOfPsusRsusAndRestrictedStockOutstandingDetail Stock-Based Compensation - Summary of PSUs, RSUs and Restricted Stock Outstanding (Detail) Details 75 false false R76.htm 996060 - Disclosure - Stock-Based Compensation - Summary of Weighted-Average Assumptions and Value of Options Granted (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureStockBasedCompensationSummaryOfWeightedAverageAssumptionsAndValueOfOptionsGrantedDetail Stock-Based Compensation - Summary of Weighted-Average Assumptions and Value of Options Granted (Detail) Details 76 false false R77.htm 996070 - Disclosure - Stock-Based Compensation (PSUs, RSUs and Restricted Stock) - Additional Information (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureStockBasedCompensationPsusRsusAndRestrictedStockAdditionalInformationDetail Stock-Based Compensation (PSUs, RSUs and Restricted Stock) - Additional Information (Detail) Details http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureStockBasedCompensationTables 77 false false R78.htm 996080 - Disclosure - Stock-Based Compensation - Summary of Stock Options Outstanding (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureStockBasedCompensationSummaryOfStockOptionsOutstandingDetail Stock-Based Compensation - Summary of Stock Options Outstanding (Detail) Details 78 false false R79.htm 996100 - Disclosure - Stock-Based Compensation (Stock Options) - Additional Information (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureStockBasedCompensationStockOptionsAdditionalInformationDetail Stock-Based Compensation (Stock Options) - Additional Information (Detail) Details http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureStockBasedCompensationTables 79 false false R80.htm 996110 - Disclosure - Stock-Based Compensation - Stock Options Outstanding (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureStockBasedCompensationStockOptionsOutstandingDetail Stock-Based Compensation - Stock Options Outstanding (Detail) Details 80 false false R81.htm 996120 - Disclosure - Investments - Gross Realized Gains and Losses on Sale of Debt Securities (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureInvestmentsGrossRealizedGainsAndLossesOnSaleOfDebtSecuritiesDetail Investments - Gross Realized Gains and Losses on Sale of Debt Securities (Detail) Details 81 false false R82.htm 996130 - Disclosure - Investments - Additional Information (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureInvestmentsAdditionalInformationDetail Investments - Additional Information (Detail) Details 82 false false R83.htm 996140 - Disclosure - Investments - Realized and Unrealized Gains and Losses for Marketable Equity Securities (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureInvestmentsRealizedAndUnrealizedGainsAndLossesForMarketableEquitySecuritiesDetail Investments - Realized and Unrealized Gains and Losses for Marketable Equity Securities (Detail) Details 83 false false R84.htm 996150 - Disclosure - Investments - Cash Equivalents and Investments held at Fair Value (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureInvestmentsCashEquivalentsAndInvestmentsHeldAtFairValueDetail Investments - Cash Equivalents and Investments held at Fair Value (Detail) Details 84 false false R85.htm 996160 - Disclosure - Inventory - Components of Inventory (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureInventoryComponentsOfInventoryDetail Inventory - Components of Inventory (Detail) Details 85 false false R86.htm 996170 - Disclosure - Inventory - Additional Information (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureInventoryAdditionalInformationDetail Inventory - Additional Information (Detail) Details 86 false false R87.htm 996180 - Disclosure - Property, Plant and Equipment - Property, Plant and Equipment, Net (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosurePropertyPlantAndEquipmentPropertyPlantAndEquipmentNetDetail Property, Plant and Equipment - Property, Plant and Equipment, Net (Detail) Details 87 false false R88.htm 996190 - Disclosure - Property, Plant and Equipment - Additional Information (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosurePropertyPlantAndEquipmentAdditionalInformationDetail Property, Plant and Equipment - Additional Information (Detail) Details 88 false false R89.htm 996200 - Disclosure - Leases - Additional Information (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureLeasesAdditionalInformationDetail Leases - Additional Information (Detail) Details 89 false false R90.htm 996210 - Disclosure - Leases - Schedule of Supplemental Balance Sheet Information Related to Operating Leases (Details) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureLeasesScheduleOfSupplementalBalanceSheetInformationRelatedToOperatingLeasesDetails Leases - Schedule of Supplemental Balance Sheet Information Related to Operating Leases (Details) Details 90 false false R91.htm 996220 - Disclosure - Leases - Components of Lease Expense included in Consolidated Statements of Loss (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureLeasesComponentsOfLeaseExpenseIncludedInConsolidatedStatementsOfLossDetail Leases - Components of Lease Expense included in Consolidated Statements of Loss (Detail) Details 91 false false R92.htm 996230 - Disclosure - Leases - Schedule of Maturity of Operating Lease Liabilities (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureLeasesScheduleOfMaturityOfOperatingLeaseLiabilitiesDetail Leases - Schedule of Maturity of Operating Lease Liabilities (Detail) Details 92 false false R93.htm 996250 - Disclosure - Leases - Schedule of Weighted Average Remaining Lease Terms and Weighted Average Discount Rates (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureLeasesScheduleOfWeightedAverageRemainingLeaseTermsAndWeightedAverageDiscountRatesDetail Leases - Schedule of Weighted Average Remaining Lease Terms and Weighted Average Discount Rates (Detail) Details 93 false false R94.htm 996260 - Disclosure - Goodwill - Summary of Changes in Carrying Amount of Goodwill (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureGoodwillSummaryOfChangesInCarryingAmountOfGoodwillDetail Goodwill - Summary of Changes in Carrying Amount of Goodwill (Detail) Details 94 false false R95.htm 996270 - Disclosure - Goodwill - Additional Information (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureGoodwillAdditionalInformationDetail Goodwill - Additional Information (Detail) Details 95 false false R96.htm 996280 - Disclosure - Intangible Assets - Summary of Intangible Assets (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureIntangibleAssetsSummaryOfIntangibleAssetsDetail Intangible Assets - Summary of Intangible Assets (Detail) Details 96 false false R97.htm 996290 - Disclosure - Intangible Assets - Additional Information (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureIntangibleAssetsAdditionalInformationDetail Intangible Assets - Additional Information (Detail) Details 97 false false R98.htm 996300 - Disclosure - Intangible Assets - Estimated Future Amortization Expense Related to Intangible Assets (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureIntangibleAssetsEstimatedFutureAmortizationExpenseRelatedToIntangibleAssetsDetail Intangible Assets - Estimated Future Amortization Expense Related to Intangible Assets (Detail) Details 98 false false R99.htm 996310 - Disclosure - Hedging - Additional Information (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureHedgingAdditionalInformationDetail Hedging - Additional Information (Detail) Details 99 false false R100.htm 996320 - Disclosure - Hedging - Schedule of Fair Values of Derivative Instruments (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureHedgingScheduleOfFairValuesOfDerivativeInstrumentsDetail Hedging - Schedule of Fair Values of Derivative Instruments (Detail) Details 100 false false R101.htm 996330 - Disclosure - Credit Agreements - Carrying Amount of Revolving Agreements (Details) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureCreditAgreementsCarryingAmountOfRevolvingAgreementsDetails Credit Agreements - Carrying Amount of Revolving Agreements (Details) Details 101 false false R102.htm 996340 - Disclosure - Credit Agreements - Additional Information (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureCreditAgreementsAdditionalInformationDetail Credit Agreements - Additional Information (Detail) Details 102 false false R103.htm 996350 - Disclosure - Credit Agreements - Additional Information (Detail1) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureCreditAgreementsAdditionalInformationDetail1 Credit Agreements - Additional Information (Detail1) Details 103 false false R104.htm 996360 - Disclosure - Income Taxes - Summary of Components of Income Tax Expense (Benefit) (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureIncomeTaxesSummaryOfComponentsOfIncomeTaxExpenseBenefitDetail Income Taxes - Summary of Components of Income Tax Expense (Benefit) (Detail) Details 104 false false R105.htm 996370 - Disclosure - Income Taxes - Effective Income Tax Rate Differs from Federal Statutory Rate (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureIncomeTaxesEffectiveIncomeTaxRateDiffersFromFederalStatutoryRateDetail Income Taxes - Effective Income Tax Rate Differs from Federal Statutory Rate (Detail) Details 105 false false R106.htm 996380 - Disclosure - Income Taxes - Loss Before Expense (Benefit) for Income Taxes (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureIncomeTaxesLossBeforeExpenseBenefitForIncomeTaxesDetail Income Taxes - Loss Before Expense (Benefit) for Income Taxes (Detail) Details 106 false false R107.htm 996390 - Disclosure - Income Taxes - Significant Components of Current and Non-current Deferred Taxes (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureIncomeTaxesSignificantComponentsOfCurrentAndNonCurrentDeferredTaxesDetail Income Taxes - Significant Components of Current and Non-current Deferred Taxes (Detail) Details 107 false false R108.htm 996400 - Disclosure - Income Taxes - Additional Information (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureIncomeTaxesAdditionalInformationDetail Income Taxes - Additional Information (Detail) Details 108 false false R109.htm 996410 - Disclosure - Income Taxes - Summary of Supplemental Balance Sheet Information Related to Deferred Tax Assets (Liabilities) (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureIncomeTaxesSummaryOfSupplementalBalanceSheetInformationRelatedToDeferredTaxAssetsLiabilitiesDetail Income Taxes - Summary of Supplemental Balance Sheet Information Related to Deferred Tax Assets (Liabilities) (Detail) Details 109 false false R110.htm 996420 - Disclosure - Income Taxes - Change in Unrecognized Income Tax Benefits (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureIncomeTaxesChangeInUnrecognizedIncomeTaxBenefitsDetail Income Taxes - Change in Unrecognized Income Tax Benefits (Detail) Details 110 false false R111.htm 996430 - Disclosure - Employee Benefit Plans (Pension Benefit Plan) - Schedule of Pension Benefit Plan Obligations and Funded Status (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansPensionBenefitPlanScheduleOfPensionBenefitPlanObligationsAndFundedStatusDetail Employee Benefit Plans (Pension Benefit Plan) - Schedule of Pension Benefit Plan Obligations and Funded Status (Detail) Details http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansTables 111 false false R112.htm 996440 - Disclosure - Employee Benefit Plans (Pension Benefit Plan) - Additional Information (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansPensionBenefitPlanAdditionalInformationDetail Employee Benefit Plans (Pension Benefit Plan) - Additional Information (Detail) Details http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansTables 112 false false R113.htm 996450 - Disclosure - Employee Benefit Plans (Pension Benefit Plan) - Summary of Net Amounts Recognized in Consolidated Balance Sheets for the Unfunded Pension Liability (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansPensionBenefitPlanSummaryOfNetAmountsRecognizedInConsolidatedBalanceSheetsForUnfundedPensionLiabilityDetail Employee Benefit Plans (Pension Benefit Plan) - Summary of Net Amounts Recognized in Consolidated Balance Sheets for the Unfunded Pension Liability (Detail) Details http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansTables 113 false false R114.htm 996460 - Disclosure - Employee Benefit Plans (Pension Benefit Plan) - Components of Net Periodic Pension Cost and Amounts Recognized Other Comprehensive (Loss) Income (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureEmployeeBenefitPlansPensionBenefitPlanComponentsOfNetPeriodicPensionCostAndAmountsRecognizedOtherComprehensiveLossIncomeDetail Employee Benefit Plans (Pension Benefit Plan) - Components of Net Periodic Pension Cost and Amounts Recognized Other Comprehensive (Loss) Income (Detail) Details http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansTables 114 false false R115.htm 996470 - Disclosure - Employee Benefit Plans (Pension Benefit Plan) - Accumulated Other Comprehensive (Loss) Income (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureEmployeeBenefitPlansPensionBenefitPlanAccumulatedOtherComprehensiveLossIncomeDetail Employee Benefit Plans (Pension Benefit Plan) - Accumulated Other Comprehensive (Loss) Income (Detail) Details http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansTables 115 false false R116.htm 996480 - Disclosure - Employee Benefit Plans (Pension Benefit Plan) - Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansPensionBenefitPlanWeightedAverageAssumptionsUsedToDetermineNetPeriodicBenefitCostDetail Employee Benefit Plans (Pension Benefit Plan) - Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost (Detail) Details http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansTables 116 false false R117.htm 996490 - Disclosure - Employee Benefit Plans (Pension Benefit Plan) - Weighted-Average Assumptions Used to Determine Benefit Obligation (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansPensionBenefitPlanWeightedAverageAssumptionsUsedToDetermineBenefitObligationDetail Employee Benefit Plans (Pension Benefit Plan) - Weighted-Average Assumptions Used to Determine Benefit Obligation (Detail) Details http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansTables 117 false false R118.htm 996500 - Disclosure - Employee Benefit Plans (Pension Benefit Plan) - Schedule of Pension Benefit Payments Expected Future Service (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansPensionBenefitPlanScheduleOfPensionBenefitPaymentsExpectedFutureServiceDetail Employee Benefit Plans (Pension Benefit Plan) - Schedule of Pension Benefit Payments Expected Future Service (Detail) Details http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansTables 118 false false R119.htm 996510 - Disclosure - Employee Benefit Plans (Pension Benefit Plan) - Schedule of Cash Equivalents and Investments Held at Fair Value (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansPensionBenefitPlanScheduleOfCashEquivalentsAndInvestmentsHeldAtFairValueDetail Employee Benefit Plans (Pension Benefit Plan) - Schedule of Cash Equivalents and Investments Held at Fair Value (Detail) Details http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansTables 119 false false R120.htm 996520 - Disclosure - Employee Benefit Plans (401(k) Savings Plans) - Additional Information (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureEmployeeBenefitPlans401kSavingsPlansAdditionalInformationDetail Employee Benefit Plans (401(k) Savings Plans) - Additional Information (Detail) Details http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansTables 120 false false R121.htm 996530 - Disclosure - Employee Benefit Plans (Deferred Compensation Plans) - Additional Information (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansDeferredCompensationPlansAdditionalInformationDetail Employee Benefit Plans (Deferred Compensation Plans) - Additional Information (Detail) Details http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansTables 121 false false R122.htm 996540 - Disclosure - Employee Benefit Plans (Deferred Compensation Plans) - Fair Value of Assets Held by Trust and Amounts Payable to Plan Participants (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansDeferredCompensationPlansFairValueOfAssetsHeldByTrustAndAmountsPayableToPlanParticipantsDetail Employee Benefit Plans (Deferred Compensation Plans) - Fair Value of Assets Held by Trust and Amounts Payable to Plan Participants (Detail) Details http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansTables 122 false false R123.htm 996560 - Disclosure - Equity - Changes in Accumulated Other Comprehensive Income (Loss), Net of Tax by Components of Accumulated Other Comprehensive Income (Loss) (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureEquityChangesInAccumulatedOtherComprehensiveIncomeLossNetOfTaxByComponentsOfAccumulatedOtherComprehensiveIncomeLossDetail Equity - Changes in Accumulated Other Comprehensive Income (Loss), Net of Tax by Components of Accumulated Other Comprehensive Income (Loss) (Detail) Details 123 false false R124.htm 996570 - Disclosure - Equity - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureEquityReclassificationsOutOfAccumulatedOtherComprehensiveIncomeLossDetail Equity - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Detail) Details 124 false false R125.htm 996580 - Disclosure - Equity - Tax Effects Related to the Change in Each Component of Other Comprehensive Income (Loss) (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureEquityTaxEffectsRelatedToTheChangeInEachComponentOfOtherComprehensiveIncomeLossDetail Equity - Tax Effects Related to the Change in Each Component of Other Comprehensive Income (Loss) (Detail) Details 125 false false R126.htm 996590 - Disclosure - Redeemable Non-controlling Interest - Summary of Redeemable Non-controlling Interest Activity (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureRedeemableNoncontrollingInterestSummaryOfRedeemableNoncontrollingInterestActivityDetail Redeemable Non-controlling Interest - Summary of Redeemable Non-controlling Interest Activity (Detail) Details 126 false false R127.htm 996600 - Disclosure - Redeemable Non-controlling Interest - Additional Information (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureRedeemableNoncontrollingInterestAdditionalInformationDetail Redeemable Non-controlling Interest - Additional Information (Detail) Details 127 false false R128.htm 996610 - Disclosure - Segment Information and Major Customers - Additional Information (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureSegmentInformationAndMajorCustomersAdditionalInformationDetail Segment Information and Major Customers - Additional Information (Detail) Details 128 false false R129.htm 996620 - Disclosure - Segment Information and Major Customers - Revenue and Gross Profit of Reportable Segments (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureSegmentInformationAndMajorCustomersRevenueAndGrossProfitOfReportableSegmentsDetail Segment Information and Major Customers - Revenue and Gross Profit of Reportable Segments (Detail) Details 129 false false R130.htm 996630 - Disclosure - Segment Information and Major Customers - Disaggregation of Sales by Category (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureSegmentInformationAndMajorCustomersDisaggregationOfSalesByCategoryDetail Segment Information and Major Customers - Disaggregation of Sales by Category (Detail) Details 130 false false R131.htm 996640 - Disclosure - Segment Information and Major Customers - Revenue Information by Geographic Area (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureSegmentInformationAndMajorCustomersRevenueInformationByGeographicAreaDetail Segment Information and Major Customers - Revenue Information by Geographic Area (Detail) Details 131 false false R132.htm 996650 - Disclosure - Liability for Warranty Returns - Additional Information (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureLiabilityForWarrantyReturnsAdditionalInformationDetail Liability for Warranty Returns - Additional Information (Detail) Details 132 false false R133.htm 996660 - Disclosure - Liability for Warranty Returns - Summary of Warranty Expense and Write-off Activity (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureLiabilityForWarrantyReturnsSummaryOfWarrantyExpenseAndWriteoffActivityDetail Liability for Warranty Returns - Summary of Warranty Expense and Write-off Activity (Detail) Details 133 false false R134.htm 996670 - Disclosure - Commitments and Contingencies - Additional Information (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesAdditionalInformationDetail Commitments and Contingencies - Additional Information (Detail) Details 134 false false R135.htm 996680 - Disclosure - Loss per Share - Summary of Calculations of Basic and Diluted Loss Per Share (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureLossPerShareSummaryOfCalculationsOfBasicAndDilutedLossPerShareDetail Loss per Share - Summary of Calculations of Basic and Diluted Loss Per Share (Detail) Details 135 false false R136.htm 996690 - Disclosure - Loss per Share - Additional Information (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureLossPerShareAdditionalInformationDetail Loss per Share - Additional Information (Detail) Details 136 false false R137.htm 996700 - Disclosure - Restructuring - Additional Information (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureRestructuringAdditionalInformationDetail Restructuring - Additional Information (Detail) Details 137 false false R138.htm 996710 - Disclosure - Restructuring - Schedule of Reconciliation of Restructuring Liability (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureRestructuringScheduleOfReconciliationOfRestructuringLiabilityDetail Restructuring - Schedule of Reconciliation of Restructuring Liability (Detail) Details 138 false false R139.htm 996720 - Disclosure - Restructuring - Schedule of Components of Restructuring Expenses Included in Consolidated Statements of Loss (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureRestructuringScheduleOfComponentsOfRestructuringExpensesIncludedInConsolidatedStatementsOfLossDetail Restructuring - Schedule of Components of Restructuring Expenses Included in Consolidated Statements of Loss (Detail) Details 139 false false R140.htm 996730 - Disclosure - Restructuring - Schedule of Components of Restructuring Expense by Geographic Area (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureRestructuringScheduleOfComponentsOfRestructuringExpenseByGeographicAreaDetail Restructuring - Schedule of Components of Restructuring Expense by Geographic Area (Detail) Details 140 false false R141.htm 996740 - Disclosure - Current Expected Credit Losses - Additional Information (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureCurrentExpectedCreditLossesAdditionalInformationDetail Current Expected Credit Losses - Additional Information (Detail) Details 141 false false R142.htm 996750 - Disclosure - Restatement of Quarterly Financial Information (Unaudited) - Schedule of Restatement of Condensed Consolidated Statement of Loss and Condensed Consolidated Statement of Comprehensive Loss (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureRestatementOfQuarterlyFinancialInformationUnauditedScheduleOfRestatementOfCondensedConsolidatedStatementOfLossAndCondensedConsolid2 Restatement of Quarterly Financial Information (Unaudited) - Schedule of Restatement of Condensed Consolidated Statement of Loss and Condensed Consolidated Statement of Comprehensive Loss (Detail) Details http://www.adtran.com/20241231/taxonomy/role/DisclosureRestatementOfQuarterlyFinancialInformationUnauditedTables 142 false false R143.htm 996760 - Disclosure - Restatement of Quarterly Financial Information (Unaudited) - Schedule of Restatement of Condensed Consolidated Statement of Loss and Condensed Consolidated Statement of Comprehensive Loss (Parenthetical) (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureRestatementOfQuarterlyFinancialInformationUnauditedScheduleOfRestatementOfCondensedConsolidatedStatementOfLossAndCondensedConsolid4 Restatement of Quarterly Financial Information (Unaudited) - Schedule of Restatement of Condensed Consolidated Statement of Loss and Condensed Consolidated Statement of Comprehensive Loss (Parenthetical) (Detail) Details http://www.adtran.com/20241231/taxonomy/role/DisclosureRestatementOfQuarterlyFinancialInformationUnauditedTables 143 false false R144.htm 996770 - Disclosure - Restatement of Quarterly Financial Information (Unaudited) - Schedule of Restatement of Condensed Consolidated Statements of Cash Flows (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureRestatementOfQuarterlyFinancialInformationUnauditedScheduleOfRestatementOfCondensedConsolidatedStatementsOfCashFlowsDetail Restatement of Quarterly Financial Information (Unaudited) - Schedule of Restatement of Condensed Consolidated Statements of Cash Flows (Detail) Details http://www.adtran.com/20241231/taxonomy/role/DisclosureRestatementOfQuarterlyFinancialInformationUnauditedTables 144 false false R145.htm 996780 - Disclosure - Restatement of Quarterly Financial Information (Unaudited) - Additional Information (Details) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureRestatementOfQuarterlyFinancialInformationUnauditedAdditionalInformationDetails Restatement of Quarterly Financial Information (Unaudited) - Additional Information (Details) Details http://www.adtran.com/20241231/taxonomy/role/DisclosureRestatementOfQuarterlyFinancialInformationUnauditedTables 145 false false R146.htm 996790 - Disclosure - Subsequent Events - Additional Information (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/DisclosureSubsequentEventsAdditionalInformationDetail Subsequent Events - Additional Information (Detail) Details 146 false false R147.htm 996800 - Disclosure - Schedule II - Valuation and Qualifying Accounts (Detail) Sheet http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureScheduleIIValuationAndQualifyingAccountsDetail Schedule II - Valuation and Qualifying Accounts (Detail) Details http://www.adtran.com/20241231/taxonomy/role/Role_DisclosureScheduleIIValuationAndQualifyingAccounts 147 false false All Reports Book All Reports adtn-20241231.htm adtn-20241231.xsd img229452591_0.jpg img229452591_1.jpg http://fasb.org/srt/2024 http://fasb.org/us-gaap/2024 http://xbrl.sec.gov/cyd/2024 http://xbrl.sec.gov/dei/2024 http://xbrl.sec.gov/ecd/2024 false false