3.22.2 html 357 347 1 false 86 0 false 7 false false R1.htm 100000 - Document - Document and Entity Information Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 100010 - Statement - Condensed Consolidated Balance Sheets (Unaudited) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_StatementCondensedConsolidatedBalanceSheetsUnaudited Condensed Consolidated Balance Sheets (Unaudited) Statements 2 false false R3.htm 100020 - Statement - Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_StatementCondensedConsolidatedBalanceSheetsUnauditedParenthetical Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) Statements 3 false false R4.htm 100030 - Statement - Condensed Consolidated Statements of Income (Unaudited) Sheet http://www.adtran.com/20220630/taxonomy/role/StatementCondensedConsolidatedStatementsOfIncomeUnaudited Condensed Consolidated Statements of Income (Unaudited) Statements 4 false false R5.htm 100040 - Statement - Condensed Consolidated Statements of Comprehensive (Loss) Income (Unaudited) Sheet http://www.adtran.com/20220630/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveLossIncomeUnaudited Condensed Consolidated Statements of Comprehensive (Loss) Income (Unaudited) Statements 5 false false R6.htm 100050 - Statement - Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_StatementCondensedConsolidatedStatementsOfChangesInStockholdersEquityUnaudited Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) Statements 6 false false R7.htm 100060 - Statement - Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parenthetical) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_StatementCondensedConsolidatedStatementsOfChangesInStockholdersEquityUnauditedParenthetical Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parenthetical) Statements 7 false false R8.htm 100070 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited Condensed Consolidated Statements of Cash Flows (Unaudited) Statements 8 false false R9.htm 100080 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 9 false false R10.htm 100090 - Disclosure - Cash, Cash Equivalents and Restricted Cash Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureCashCashEquivalentsAndRestrictedCash Cash, Cash Equivalents and Restricted Cash Notes 10 false false R11.htm 100100 - Disclosure - Revenue Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureRevenue Revenue Notes 11 false false R12.htm 100110 - Disclosure - Income Taxes Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureIncomeTaxes Income Taxes Notes 12 false false R13.htm 100120 - Disclosure - Stock-Based Compensation Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureStockBasedCompensation Stock-Based Compensation Notes 13 false false R14.htm 100130 - Disclosure - Investments Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureInvestments Investments Notes 14 false false R15.htm 100140 - Disclosure - Inventory Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureInventory Inventory Notes 15 false false R16.htm 100150 - Disclosure - Property, Plant and Equipment Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosurePropertyPlantAndEquipment Property, Plant and Equipment Notes 16 false false R17.htm 100160 - Disclosure - Goodwill Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureGoodwill Goodwill Notes 17 false false R18.htm 100170 - Disclosure - Intangible Assets Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureIntangibleAssets Intangible Assets Notes 18 false false R19.htm 100180 - Disclosure - Leases Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureLeases Leases Notes 19 false false R20.htm 100190 - Disclosure - Revolving Credit Agreements Sheet http://www.adtran.com/20220630/taxonomy/role/DisclosureRevolvingCreditAgreements Revolving Credit Agreements Notes 20 false false R21.htm 100200 - Disclosure - Stockholders' Equity Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureStockholdersEquity Stockholders' Equity Notes 21 false false R22.htm 100210 - Disclosure - Earnings Per Share Sheet http://www.adtran.com/20220630/taxonomy/role/DisclosureEarningsPerShare Earnings Per Share Notes 22 false false R23.htm 100220 - Disclosure - Segment Information Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureSegmentInformation Segment Information Notes 23 false false R24.htm 100230 - Disclosure - Liability for Warranty Returns Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureLiabilityForWarrantyReturns Liability for Warranty Returns Notes 24 false false R25.htm 100240 - Disclosure - Commitments and Contingencies Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureCommitmentsAndContingencies Commitments and Contingencies Notes 25 false false R26.htm 100250 - Disclosure - Restructuring Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureRestructuring Restructuring Notes 26 false false R27.htm 100260 - Disclosure - Subsequent Events Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureSubsequentEvents Subsequent Events Notes 27 false false R28.htm 100270 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Policies http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies 28 false false R29.htm 100280 - Disclosure - Cash, Cash Equivalents and Restricted Cash (Tables) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureCashCashEquivalentsAndRestrictedCashTables Cash, Cash Equivalents and Restricted Cash (Tables) Tables http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureCashCashEquivalentsAndRestrictedCash 29 false false R30.htm 100290 - Disclosure - Revenue (Tables) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureRevenueTables Revenue (Tables) Tables http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureRevenue 30 false false R31.htm 100300 - Disclosure - Income Taxes (Tables) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureIncomeTaxesTables Income Taxes (Tables) Tables http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureIncomeTaxes 31 false false R32.htm 100310 - Disclosure - Stock-Based Compensation (Tables) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureStockBasedCompensationTables Stock-Based Compensation (Tables) Tables http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureStockBasedCompensation 32 false false R33.htm 100320 - Disclosure - Investments (Tables) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureInvestmentsTables Investments (Tables) Tables http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureInvestments 33 false false R34.htm 100330 - Disclosure - Inventory (Tables) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureInventoryTables Inventory (Tables) Tables http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureInventory 34 false false R35.htm 100340 - Disclosure - Property, Plant and Equipment (Tables) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosurePropertyPlantAndEquipmentTables Property, Plant and Equipment (Tables) Tables http://www.adtran.com/20220630/taxonomy/role/Role_DisclosurePropertyPlantAndEquipment 35 false false R36.htm 100350 - Disclosure - Intangible Assets (Tables) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureIntangibleAssetsTables Intangible Assets (Tables) Tables http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureIntangibleAssets 36 false false R37.htm 100360 - Disclosure - Leases (Tables) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureLeasesTables Leases (Tables) Tables http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureLeases 37 false false R38.htm 100370 - Disclosure - Stockholders' Equity (Tables) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureStockholdersEquityTables Stockholders' Equity (Tables) Tables http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureStockholdersEquity 38 false false R39.htm 100380 - Disclosure - Earnings Per Share (Tables) Sheet http://www.adtran.com/20220630/taxonomy/role/DisclosureEarningsPerShareTables Earnings Per Share (Tables) Tables http://www.adtran.com/20220630/taxonomy/role/DisclosureEarningsPerShare 39 false false R40.htm 100390 - Disclosure - Segment Information (Tables) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureSegmentInformationTables Segment Information (Tables) Tables http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureSegmentInformation 40 false false R41.htm 100400 - Disclosure - Liability for Warranty Returns (Tables) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureLiabilityForWarrantyReturnsTables Liability for Warranty Returns (Tables) Tables http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureLiabilityForWarrantyReturns 41 false false R42.htm 100410 - Disclosure - Restructuring (Tables) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureRestructuringTables Restructuring (Tables) Tables http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureRestructuring 42 false false R43.htm 100420 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Details) Sheet http://www.adtran.com/20220630/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetails Summary of Significant Accounting Policies - Additional Information (Details) Details 43 false false R44.htm 100430 - Disclosure - Cash, Cash Equivalents and Restricted Cash - Summary of Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureCashCashEquivalentsAndRestrictedCashSummaryOfReconciliationOfCashCashEquivalentsAndRestrictedCashDetails Cash, Cash Equivalents and Restricted Cash - Summary of Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) Details 44 false false R45.htm 100440 - Disclosure - Revenue - Additional Information (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureRevenueAdditionalInformationDetail Revenue - Additional Information (Detail) Details 45 false false R46.htm 100450 - Disclosure - Revenue - Disaggregate of Revenue by Reportable Segment and Revenue Category (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureRevenueDisaggregateOfRevenueByReportableSegmentAndRevenueCategoryDetail Revenue - Disaggregate of Revenue by Reportable Segment and Revenue Category (Detail) Details 46 false false R47.htm 100460 - Disclosure - Revenue - Additional Information (Detail1) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureRevenueAdditionalInformationDetail1 Revenue - Additional Information (Detail1) Details 47 false false R48.htm 100470 - Disclosure - Revenue - Information about Receivables, Contract Assets, and Unearned Revenue from Contracts with Customers (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureRevenueInformationAboutReceivablesContractAssetsAndUnearnedRevenueFromContractsWithCustomersDetail Revenue - Information about Receivables, Contract Assets, and Unearned Revenue from Contracts with Customers (Detail) Details 48 false false R49.htm 100480 - Disclosure - Income Taxes - Additional Information (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureIncomeTaxesAdditionalInformationDetail Income Taxes - Additional Information (Detail) Details 49 false false R50.htm 100490 - Disclosure - Income Taxes - Summary of Supplemental Balance Sheet Information Related to Deferred Tax Assets (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureIncomeTaxesSummaryOfSupplementalBalanceSheetInformationRelatedToDeferredTaxAssetsDetail Income Taxes - Summary of Supplemental Balance Sheet Information Related to Deferred Tax Assets (Detail) Details 50 false false R51.htm 100500 - Disclosure - Stock-Based Compensation - Stock-Based Compensation Expense Related to Stock Options, PSUs, RSUs and Restricted Stock (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureStockBasedCompensationStockBasedCompensationExpenseRelatedToStockOptionsPsusRsusAndRestrictedStockDetail Stock-Based Compensation - Stock-Based Compensation Expense Related to Stock Options, PSUs, RSUs and Restricted Stock (Detail) Details 51 false false R52.htm 100510 - Disclosure - Stock-Based Compensation - Summary of PSUs, RSUs and Restricted Stock Outstanding (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureStockBasedCompensationSummaryOfPsusRsusAndRestrictedStockOutstandingDetail Stock-Based Compensation - Summary of PSUs, RSUs and Restricted Stock Outstanding (Detail) Details 52 false false R53.htm 100520 - Disclosure - Stock-Based Compensation (PSUs, RSUs and Restricted Stock) - Additional Information (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureStockBasedCompensationPsusRsusAndRestrictedStockAdditionalInformationDetail Stock-Based Compensation (PSUs, RSUs and Restricted Stock) - Additional Information (Detail) Details http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureStockBasedCompensationTables 53 false false R54.htm 100530 - Disclosure - Stock-Based Compensation - Summary of Stock Options Outstanding (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureStockBasedCompensationSummaryOfStockOptionsOutstandingDetail Stock-Based Compensation - Summary of Stock Options Outstanding (Detail) Details 54 false false R55.htm 100540 - Disclosure - Stock-Based Compensation (Stock Options) - Additional Information (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureStockBasedCompensationStockOptionsAdditionalInformationDetail Stock-Based Compensation (Stock Options) - Additional Information (Detail) Details http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureStockBasedCompensationTables 55 false false R56.htm 100550 - Disclosure - Investments - Debt Securities and Other Investments, Included on Condensed Consolidated Balance Sheet and Recorded at Fair Value (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureInvestmentsDebtSecuritiesAndOtherInvestmentsIncludedOnCondensedConsolidatedBalanceSheetAndRecordedAtFairValueDetail Investments - Debt Securities and Other Investments, Included on Condensed Consolidated Balance Sheet and Recorded at Fair Value (Detail) Details 56 false false R57.htm 100560 - Disclosure - Investments - Contractual Maturities of Debt Securities and Other Investments (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureInvestmentsContractualMaturitiesOfDebtSecuritiesAndOtherInvestmentsDetail Investments - Contractual Maturities of Debt Securities and Other Investments (Detail) Details 57 false false R58.htm 100570 - Disclosure - Investments - Gross Realized Gains and Losses on Sale of Debt Securities (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureInvestmentsGrossRealizedGainsAndLossesOnSaleOfDebtSecuritiesDetail Investments - Gross Realized Gains and Losses on Sale of Debt Securities (Detail) Details 58 false false R59.htm 100580 - Disclosure - Investments - Additional Information (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureInvestmentsAdditionalInformationDetail Investments - Additional Information (Detail) Details 59 false false R60.htm 100590 - Disclosure - Investments - Realized and Unrealized Gains and Losses related to Marketable Equity Securities (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureInvestmentsRealizedAndUnrealizedGainsAndLossesRelatedToMarketableEquitySecuritiesDetail Investments - Realized and Unrealized Gains and Losses related to Marketable Equity Securities (Detail) Details 60 false false R61.htm 100600 - Disclosure - Investments - Cash Equivalents and Investments held at Fair Value (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureInvestmentsCashEquivalentsAndInvestmentsHeldAtFairValueDetail Investments - Cash Equivalents and Investments held at Fair Value (Detail) Details 61 false false R62.htm 100610 - Disclosure - Inventory - Components of Inventory (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureInventoryComponentsOfInventoryDetail Inventory - Components of Inventory (Detail) Details 62 false false R63.htm 100620 - Disclosure - Inventory - Additional Information (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureInventoryAdditionalInformationDetail Inventory - Additional Information (Detail) Details 63 false false R64.htm 100630 - Disclosure - Property, Plant and Equipment - Property, Plant and Equipment (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosurePropertyPlantAndEquipmentPropertyPlantAndEquipmentDetail Property, Plant and Equipment - Property, Plant and Equipment (Detail) Details 64 false false R65.htm 100640 - Disclosure - Property, Plant and Equipment - Additional Information (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosurePropertyPlantAndEquipmentAdditionalInformationDetail Property, Plant and Equipment - Additional Information (Detail) Details 65 false false R66.htm 100650 - Disclosure - Goodwill - Additional Information (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureGoodwillAdditionalInformationDetail Goodwill - Additional Information (Detail) Details 66 false false R67.htm 100660 - Disclosure - Intangible Assets - Summary of Intangible Assets (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureIntangibleAssetsSummaryOfIntangibleAssetsDetail Intangible Assets - Summary of Intangible Assets (Detail) Details 67 false false R68.htm 100670 - Disclosure - Intangible Assets - Additional Information (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureIntangibleAssetsAdditionalInformationDetail Intangible Assets - Additional Information (Detail) Details 68 false false R69.htm 100680 - Disclosure - Intangible Assets - Estimated Future Amortization Expense Related to Intangible Assets (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureIntangibleAssetsEstimatedFutureAmortizationExpenseRelatedToIntangibleAssetsDetail Intangible Assets - Estimated Future Amortization Expense Related to Intangible Assets (Detail) Details 69 false false R70.htm 100690 - Disclosure - Leases - Net Investment in Sales-Type Leases (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureLeasesNetInvestmentInSalesTypeLeasesDetail Leases - Net Investment in Sales-Type Leases (Detail) Details 70 false false R71.htm 100700 - Disclosure - Revolving Credit Agreements - Additional Information (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/DisclosureRevolvingCreditAgreementsAdditionalInformationDetail Revolving Credit Agreements - Additional Information (Detail) Details 71 false false R72.htm 100710 - Disclosure - Stockholders' Equity - Additional Information (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureStockholdersEquityAdditionalInformationDetail Stockholders' Equity - Additional Information (Detail) Details 72 false false R73.htm 100720 - Disclosure - Stockholders' Equity - Changes in Accumulated Other Comprehensive Loss, Net of Tax, by Component (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/DisclosureStockholdersEquityChangesInAccumulatedOtherComprehensiveLossNetOfTaxByComponentDetail Stockholders' Equity - Changes in Accumulated Other Comprehensive Loss, Net of Tax, by Component (Detail) Details 73 false false R74.htm 100730 - Disclosure - Stockholders' Equity - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureStockholdersEquityReclassificationsOutOfAccumulatedOtherComprehensiveIncomeLossDetail Stockholders' Equity - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Detail) Details 74 false false R75.htm 100740 - Disclosure - Stockholders' Equity - Tax Effects Related to the Change in Each Component of Other Comprehensive Loss (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/DisclosureStockholdersEquityTaxEffectsRelatedToTheChangeInEachComponentOfOtherComprehensiveLossDetail Stockholders' Equity - Tax Effects Related to the Change in Each Component of Other Comprehensive Loss (Detail) Details 75 false false R76.htm 100750 - Disclosure - Earnings Per Share - Summary of Calculation of Basic and Diluted Earnings (Loss) Per Share (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/DisclosureEarningsPerShareSummaryOfCalculationOfBasicAndDilutedEarningsLossPerShareDetail Earnings Per Share - Summary of Calculation of Basic and Diluted Earnings (Loss) Per Share (Detail) Details 76 false false R77.htm 100760 - Disclosure - Earnings Per Share - Additional Information (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/DisclosureEarningsPerShareAdditionalInformationDetail Earnings Per Share - Additional Information (Detail) Details 77 false false R78.htm 100770 - Disclosure - Segment Information - Additional Information (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureSegmentInformationAdditionalInformationDetail Segment Information - Additional Information (Detail) Details 78 false false R79.htm 100780 - Disclosure - Segment Information - Revenue and Gross Profit of Reportable Segments (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureSegmentInformationRevenueAndGrossProfitOfReportableSegmentsDetail Segment Information - Revenue and Gross Profit of Reportable Segments (Detail) Details 79 false false R80.htm 100790 - Disclosure - Segment Information - Revenue Information by Category (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureSegmentInformationRevenueInformationByCategoryDetail Segment Information - Revenue Information by Category (Detail) Details 80 false false R81.htm 100800 - Disclosure - Segment Information - Revenue Information by Geographic Area (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureSegmentInformationRevenueInformationByGeographicAreaDetail Segment Information - Revenue Information by Geographic Area (Detail) Details 81 false false R82.htm 100810 - Disclosure - Liability for Warranty Returns - Additional Information (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureLiabilityForWarrantyReturnsAdditionalInformationDetail Liability for Warranty Returns - Additional Information (Detail) Details 82 false false R83.htm 100820 - Disclosure - Liability for Warranty Returns - Summary of Warranty Expense and Write-off Activity (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/DisclosureLiabilityForWarrantyReturnsSummaryOfWarrantyExpenseAndWriteoffActivityDetail Liability for Warranty Returns - Summary of Warranty Expense and Write-off Activity (Detail) Details 83 false false R84.htm 100830 - Disclosure - Commitments and Contingencies - Additional Information (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesAdditionalInformationDetail Commitments and Contingencies - Additional Information (Detail) Details 84 false false R85.htm 100840 - Disclosure - Restructuring - Additional Information (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureRestructuringAdditionalInformationDetail Restructuring - Additional Information (Detail) Details 85 false false R86.htm 100850 - Disclosure - Restructuring - Schedule of Reconciliation of Restructuring Liability (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureRestructuringScheduleOfReconciliationOfRestructuringLiabilityDetail Restructuring - Schedule of Reconciliation of Restructuring Liability (Detail) Details 86 false false R87.htm 100860 - Disclosure - Restructuring - Schedule of Components of Restructuring Expenses Including in Condensed Consolidated Statements of (Loss) Income (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/DisclosureRestructuringScheduleOfComponentsOfRestructuringExpensesIncludingInCondensedConsolidatedStatementsOfLossIncomeDetail Restructuring - Schedule of Components of Restructuring Expenses Including in Condensed Consolidated Statements of (Loss) Income (Detail) Details 87 false false R88.htm 100870 - Disclosure - Restructuring - Schedule of Components of Restructuring Expense by Geographic Area (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureRestructuringScheduleOfComponentsOfRestructuringExpenseByGeographicAreaDetail Restructuring - Schedule of Components of Restructuring Expense by Geographic Area (Detail) Details 88 false false R89.htm 100880 - Disclosure - Subsequent Events - Additional Information (Detail) Sheet http://www.adtran.com/20220630/taxonomy/role/Role_DisclosureSubsequentEventsAdditionalInformationDetail Subsequent Events - Additional Information (Detail) Details 89 false false All Reports Book All Reports adtn-20220630.htm adtn-20220630.xsd adtn-20220630_cal.xml adtn-20220630_def.xml adtn-20220630_lab.xml adtn-20220630_pre.xml adtn-ex10_8.htm adtn-ex31.htm adtn-ex32.htm http://fasb.org/us-gaap/2022 http://xbrl.sec.gov/dei/2022 true true