3.26.1 html 270 353 1 false 92 0 false 9 false false R1.htm 0000001 - Document - Cover Page Sheet http://www.abglobal.com/role/CoverPage Cover Page Cover 1 false false R2.htm 9952151 - Statement - Condensed Consolidated Statements of Financial Condition Sheet http://www.abglobal.com/role/CondensedConsolidatedStatementsofFinancialCondition Condensed Consolidated Statements of Financial Condition Statements 2 false false R3.htm 9952152 - Statement - Condensed Consolidated Statements of Financial Condition (Parenthetical) Sheet http://www.abglobal.com/role/CondensedConsolidatedStatementsofFinancialConditionParenthetical Condensed Consolidated Statements of Financial Condition (Parenthetical) Statements 3 false false R4.htm 9952153 - Statement - Condensed Consolidated Statements of Income Sheet http://www.abglobal.com/role/CondensedConsolidatedStatementsofIncome Condensed Consolidated Statements of Income Statements 4 false false R5.htm 9952154 - Statement - Condensed Consolidated Statements of Comprehensive Income Sheet http://www.abglobal.com/role/CondensedConsolidatedStatementsofComprehensiveIncome Condensed Consolidated Statements of Comprehensive Income Statements 5 false false R6.htm 9952155 - Statement - Condensed Consolidated Statements of Changes in Partners' Capital Sheet http://www.abglobal.com/role/CondensedConsolidatedStatementsofChangesinPartnersCapital Condensed Consolidated Statements of Changes in Partners' Capital Statements 6 false false R7.htm 9952156 - Statement - Condensed Consolidated Statements of Cash Flows Sheet http://www.abglobal.com/role/CondensedConsolidatedStatementsofCashFlows Condensed Consolidated Statements of Cash Flows Statements 7 false false R8.htm 9952157 - Disclosure - Business Description, Organization and Basis of Presentation Sheet http://www.abglobal.com/role/BusinessDescriptionOrganizationandBasisofPresentation Business Description, Organization and Basis of Presentation Notes 8 false false R9.htm 9952158 - Disclosure - Significant Accounting Policies Sheet http://www.abglobal.com/role/SignificantAccountingPolicies Significant Accounting Policies Notes 9 false false R10.htm 9952159 - Disclosure - Revenue Recognition Sheet http://www.abglobal.com/role/RevenueRecognition Revenue Recognition Notes 10 false false R11.htm 9952160 - Disclosure - Long-term Incentive Compensation Plans Sheet http://www.abglobal.com/role/LongtermIncentiveCompensationPlans Long-term Incentive Compensation Plans Notes 11 false false R12.htm 9952161 - Disclosure - Net Income per Unit Sheet http://www.abglobal.com/role/NetIncomeperUnit Net Income per Unit Notes 12 false false R13.htm 9952162 - Disclosure - Cash Distributions Sheet http://www.abglobal.com/role/CashDistributions Cash Distributions Notes 13 false false R14.htm 9952163 - Disclosure - Cash and Securities Segregated Under Federal Regulations and Other Requirements Sheet http://www.abglobal.com/role/CashandSecuritiesSegregatedUnderFederalRegulationsandOtherRequirements Cash and Securities Segregated Under Federal Regulations and Other Requirements Notes 14 false false R15.htm 9952164 - Disclosure - Investments Sheet http://www.abglobal.com/role/Investments Investments Notes 15 false false R16.htm 9952165 - Disclosure - Derivative Instruments Sheet http://www.abglobal.com/role/DerivativeInstruments Derivative Instruments Notes 16 false false R17.htm 9952166 - Disclosure - Offsetting Assets and Liabilities Sheet http://www.abglobal.com/role/OffsettingAssetsandLiabilities Offsetting Assets and Liabilities Notes 17 false false R18.htm 9952167 - Disclosure - Fair Value Sheet http://www.abglobal.com/role/FairValue Fair Value Notes 18 false false R19.htm 9952168 - Disclosure - Commitments and Contingencies Sheet http://www.abglobal.com/role/CommitmentsandContingencies Commitments and Contingencies Notes 19 false false R20.htm 9952169 - Disclosure - Leases Sheet http://www.abglobal.com/role/Leases Leases Notes 20 false false R21.htm 9952170 - Disclosure - Consolidated Company-Sponsored Investment Funds Sheet http://www.abglobal.com/role/ConsolidatedCompanySponsoredInvestmentFunds Consolidated Company-Sponsored Investment Funds Notes 21 false false R22.htm 9952171 - Disclosure - Units Outstanding Sheet http://www.abglobal.com/role/UnitsOutstanding Units Outstanding Notes 22 false false R23.htm 9952172 - Disclosure - Debt Sheet http://www.abglobal.com/role/Debt Debt Notes 23 false false R24.htm 9952173 - Disclosure - Business Segment Information Sheet http://www.abglobal.com/role/BusinessSegmentInformation Business Segment Information Notes 24 false false R25.htm 9952174 - Disclosure - Divestitures Sheet http://www.abglobal.com/role/Divestitures Divestitures Notes 25 false false R26.htm 995445 - Disclosure - Insider Trading Arrangements Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements Insider Trading Arrangements Notes 26 false false R27.htm 9955511 - Disclosure - Business Description, Organization and Basis of Presentation (Policies) Sheet http://www.abglobal.com/role/BusinessDescriptionOrganizationandBasisofPresentationPolicies Business Description, Organization and Basis of Presentation (Policies) Policies http://www.abglobal.com/role/SignificantAccountingPolicies 27 false false R28.htm 9955512 - Disclosure - Business Description, Organization and Basis of Presentation (Tables) Sheet http://www.abglobal.com/role/BusinessDescriptionOrganizationandBasisofPresentationTables Business Description, Organization and Basis of Presentation (Tables) Tables http://www.abglobal.com/role/BusinessDescriptionOrganizationandBasisofPresentation 28 false false R29.htm 9955513 - Disclosure - Revenue Recognition (Tables) Sheet http://www.abglobal.com/role/RevenueRecognitionTables Revenue Recognition (Tables) Tables http://www.abglobal.com/role/RevenueRecognition 29 false false R30.htm 9955514 - Disclosure - Long-term Incentive Compensation Plans (Tables) Sheet http://www.abglobal.com/role/LongtermIncentiveCompensationPlansTables Long-term Incentive Compensation Plans (Tables) Tables http://www.abglobal.com/role/LongtermIncentiveCompensationPlans 30 false false R31.htm 9955515 - Disclosure - Net Income per Unit (Tables) Sheet http://www.abglobal.com/role/NetIncomeperUnitTables Net Income per Unit (Tables) Tables http://www.abglobal.com/role/NetIncomeperUnit 31 false false R32.htm 9955516 - Disclosure - Investments (Tables) Sheet http://www.abglobal.com/role/InvestmentsTables Investments (Tables) Tables http://www.abglobal.com/role/Investments 32 false false R33.htm 9955517 - Disclosure - Derivative Instruments (Tables) Sheet http://www.abglobal.com/role/DerivativeInstrumentsTables Derivative Instruments (Tables) Tables http://www.abglobal.com/role/DerivativeInstruments 33 false false R34.htm 9955518 - Disclosure - Offsetting Assets and Liabilities (Tables) Sheet http://www.abglobal.com/role/OffsettingAssetsandLiabilitiesTables Offsetting Assets and Liabilities (Tables) Tables http://www.abglobal.com/role/OffsettingAssetsandLiabilities 34 false false R35.htm 9955519 - Disclosure - Fair Value (Tables) Sheet http://www.abglobal.com/role/FairValueTables Fair Value (Tables) Tables http://www.abglobal.com/role/FairValue 35 false false R36.htm 9955520 - Disclosure - Leases (Tables) Sheet http://www.abglobal.com/role/LeasesTables Leases (Tables) Tables http://www.abglobal.com/role/Leases 36 false false R37.htm 9955521 - Disclosure - Consolidated Company-Sponsored Investment Funds (Tables) Sheet http://www.abglobal.com/role/ConsolidatedCompanySponsoredInvestmentFundsTables Consolidated Company-Sponsored Investment Funds (Tables) Tables http://www.abglobal.com/role/ConsolidatedCompanySponsoredInvestmentFunds 37 false false R38.htm 9955522 - Disclosure - Units Outstanding (Tables) Sheet http://www.abglobal.com/role/UnitsOutstandingTables Units Outstanding (Tables) Tables http://www.abglobal.com/role/UnitsOutstanding 38 false false R39.htm 9955523 - Disclosure - Business Segment Information (Tables) Sheet http://www.abglobal.com/role/BusinessSegmentInformationTables Business Segment Information (Tables) Tables http://www.abglobal.com/role/BusinessSegmentInformation 39 false false R40.htm 9955524 - Disclosure - Business Description, Organization and Basis of Presentation - Additional Information (Details) Sheet http://www.abglobal.com/role/BusinessDescriptionOrganizationandBasisofPresentationAdditionalInformationDetails Business Description, Organization and Basis of Presentation - Additional Information (Details) Details 40 false false R41.htm 9955525 - Disclosure - Business Description, Organization and Basis of Presentation - Summary of Ownership Structure (Details) Sheet http://www.abglobal.com/role/BusinessDescriptionOrganizationandBasisofPresentationSummaryofOwnershipStructureDetails Business Description, Organization and Basis of Presentation - Summary of Ownership Structure (Details) Details 41 false false R42.htm 9955526 - Disclosure - Revenue Recognition (Details) Sheet http://www.abglobal.com/role/RevenueRecognitionDetails Revenue Recognition (Details) Details http://www.abglobal.com/role/RevenueRecognitionTables 42 false false R43.htm 9955527 - Disclosure - Long-term Incentive Compensation Plans - Summary of Share-based Compensation, Employee Stock Purchase Plan, Activity (Details) Sheet http://www.abglobal.com/role/LongtermIncentiveCompensationPlansSummaryofSharebasedCompensationEmployeeStockPurchasePlanActivityDetails Long-term Incentive Compensation Plans - Summary of Share-based Compensation, Employee Stock Purchase Plan, Activity (Details) Details 43 false false R44.htm 9955528 - Disclosure - Long-term Incentive Compensation Plans - Additional Information (Details) Sheet http://www.abglobal.com/role/LongtermIncentiveCompensationPlansAdditionalInformationDetails Long-term Incentive Compensation Plans - Additional Information (Details) Details 44 false false R45.htm 9955529 - Disclosure - Net Income per Unit - Additional Information (Details) Sheet http://www.abglobal.com/role/NetIncomeperUnitAdditionalInformationDetails Net Income per Unit - Additional Information (Details) Details 45 false false R46.htm 9955530 - Disclosure - Net Income per Unit - Summary of Earnings Per Unit, Basic and Diluted (Details) Sheet http://www.abglobal.com/role/NetIncomeperUnitSummaryofEarningsPerUnitBasicandDilutedDetails Net Income per Unit - Summary of Earnings Per Unit, Basic and Diluted (Details) Details 46 false false R47.htm 9955531 - Disclosure - Cash Distributions (Details) Sheet http://www.abglobal.com/role/CashDistributionsDetails Cash Distributions (Details) Details http://www.abglobal.com/role/CashDistributions 47 false false R48.htm 9955532 - Disclosure - Cash and Securities Segregated Under Federal Regulations and Other Requirements (Details) Sheet http://www.abglobal.com/role/CashandSecuritiesSegregatedUnderFederalRegulationsandOtherRequirementsDetails Cash and Securities Segregated Under Federal Regulations and Other Requirements (Details) Details http://www.abglobal.com/role/CashandSecuritiesSegregatedUnderFederalRegulationsandOtherRequirements 48 false false R49.htm 9955533 - Disclosure - Investments - Summary of Investments (Details) Sheet http://www.abglobal.com/role/InvestmentsSummaryofInvestmentsDetails Investments - Summary of Investments (Details) Details 49 false false R50.htm 9955534 - Disclosure - Investments - Additional Information (Details) Sheet http://www.abglobal.com/role/InvestmentsAdditionalInformationDetails Investments - Additional Information (Details) Details 50 false false R51.htm 9955535 - Disclosure - Investments - Summary of Unrealized Gains (Losses) Related to Equity Securities (Details) Sheet http://www.abglobal.com/role/InvestmentsSummaryofUnrealizedGainsLossesRelatedtoEquitySecuritiesDetails Investments - Summary of Unrealized Gains (Losses) Related to Equity Securities (Details) Details 51 false false R52.htm 9955536 - Disclosure - Derivative Instruments - Summary of Notional Value and Fair Value of Derivative Instruments (Details) Sheet http://www.abglobal.com/role/DerivativeInstrumentsSummaryofNotionalValueandFairValueofDerivativeInstrumentsDetails Derivative Instruments - Summary of Notional Value and Fair Value of Derivative Instruments (Details) Details 52 false false R53.htm 9955537 - Disclosure - Derivative Instruments - Summary of Gains and Losses for Derivative Instruments Recognized in Investment Gains (Losses) (Details) Sheet http://www.abglobal.com/role/DerivativeInstrumentsSummaryofGainsandLossesforDerivativeInstrumentsRecognizedinInvestmentGainsLossesDetails Derivative Instruments - Summary of Gains and Losses for Derivative Instruments Recognized in Investment Gains (Losses) (Details) Details 53 false false R54.htm 9955538 - Disclosure - Derivative Instruments - Additional Information (Details) Sheet http://www.abglobal.com/role/DerivativeInstrumentsAdditionalInformationDetails Derivative Instruments - Additional Information (Details) Details 54 false false R55.htm 9955539 - Disclosure - Offsetting Assets and Liabilities - Summary of Offsetting Assets (Details) Sheet http://www.abglobal.com/role/OffsettingAssetsandLiabilitiesSummaryofOffsettingAssetsDetails Offsetting Assets and Liabilities - Summary of Offsetting Assets (Details) Details 55 false false R56.htm 9955540 - Disclosure - Offsetting Assets and Liabilities - Summary of Offsetting Liabilities (Details) Sheet http://www.abglobal.com/role/OffsettingAssetsandLiabilitiesSummaryofOffsettingLiabilitiesDetails Offsetting Assets and Liabilities - Summary of Offsetting Liabilities (Details) Details 56 false false R57.htm 9955541 - Disclosure - Fair Value - Summary of Valuation of Financial Instruments by Pricing Observability Levels (Details) Sheet http://www.abglobal.com/role/FairValueSummaryofValuationofFinancialInstrumentsbyPricingObservabilityLevelsDetails Fair Value - Summary of Valuation of Financial Instruments by Pricing Observability Levels (Details) Details 57 false false R58.htm 9955542 - Disclosure - Fair Value - Additional Information (Details) Sheet http://www.abglobal.com/role/FairValueAdditionalInformationDetails Fair Value - Additional Information (Details) Details 58 false false R59.htm 9955543 - Disclosure - Fair Value - Summary of Change in Carrying Value of Level 3 Financial Instruments (Details) Sheet http://www.abglobal.com/role/FairValueSummaryofChangeinCarryingValueofLevel3FinancialInstrumentsDetails Fair Value - Summary of Change in Carrying Value of Level 3 Financial Instruments (Details) Details 59 false false R60.htm 9955544 - Disclosure - Fair Value - Summary of Change in Carrying Value Associated with Contingent Payment Arrangements Level 3 Instruments (Details) Sheet http://www.abglobal.com/role/FairValueSummaryofChangeinCarryingValueAssociatedwithContingentPaymentArrangementsLevel3InstrumentsDetails Fair Value - Summary of Change in Carrying Value Associated with Contingent Payment Arrangements Level 3 Instruments (Details) Details 60 false false R61.htm 9955545 - Disclosure - Commitments and Contingencies (Details) Sheet http://www.abglobal.com/role/CommitmentsandContingenciesDetails Commitments and Contingencies (Details) Details http://www.abglobal.com/role/CommitmentsandContingencies 61 false false R62.htm 9955546 - Disclosure - Leases - Additional Information (Details) Sheet http://www.abglobal.com/role/LeasesAdditionalInformationDetails Leases - Additional Information (Details) Details 62 false false R63.htm 9955547 - Disclosure - Leases - Summary of Leases (Details) Sheet http://www.abglobal.com/role/LeasesSummaryofLeasesDetails Leases - Summary of Leases (Details) Details 63 false false R64.htm 9955548 - Disclosure - Leases - Summary of Components of Lease Expense (Details) Sheet http://www.abglobal.com/role/LeasesSummaryofComponentsofLeaseExpenseDetails Leases - Summary of Components of Lease Expense (Details) Details 64 false false R65.htm 9955549 - Disclosure - Leases - Summary of Maturities of Lease Liabilities (Details) Sheet http://www.abglobal.com/role/LeasesSummaryofMaturitiesofLeaseLiabilitiesDetails Leases - Summary of Maturities of Lease Liabilities (Details) Details 65 false false R66.htm 9955550 - Disclosure - Leases - Summary of Lease Term and Discount Rate (Details) Sheet http://www.abglobal.com/role/LeasesSummaryofLeaseTermandDiscountRateDetails Leases - Summary of Lease Term and Discount Rate (Details) Details 66 false false R67.htm 9955551 - Disclosure - Leases - Summary of Supplemental Cash Flow (Details) Sheet http://www.abglobal.com/role/LeasesSummaryofSupplementalCashFlowDetails Leases - Summary of Supplemental Cash Flow (Details) Details 67 false false R68.htm 9955552 - Disclosure - Consolidated Company-Sponsored Investment Funds - Summary of Balance Sheet Amounts (Details) Sheet http://www.abglobal.com/role/ConsolidatedCompanySponsoredInvestmentFundsSummaryofBalanceSheetAmountsDetails Consolidated Company-Sponsored Investment Funds - Summary of Balance Sheet Amounts (Details) Details 68 false false R69.htm 9955553 - Disclosure - Consolidated Company-Sponsored Investment Funds - Additional Information (Details) Sheet http://www.abglobal.com/role/ConsolidatedCompanySponsoredInvestmentFundsAdditionalInformationDetails Consolidated Company-Sponsored Investment Funds - Additional Information (Details) Details 69 false false R70.htm 9955554 - Disclosure - Consolidated Company-Sponsored Investment Funds - Summary of Redeemable Noncontrolling Interest (Details) Sheet http://www.abglobal.com/role/ConsolidatedCompanySponsoredInvestmentFundsSummaryofRedeemableNoncontrollingInterestDetails Consolidated Company-Sponsored Investment Funds - Summary of Redeemable Noncontrolling Interest (Details) Details 70 false false R71.htm 9955555 - Disclosure - Consolidated Company-Sponsored Investment Funds - Summary of Fair Value (Details) Sheet http://www.abglobal.com/role/ConsolidatedCompanySponsoredInvestmentFundsSummaryofFairValueDetails Consolidated Company-Sponsored Investment Funds - Summary of Fair Value (Details) Details 71 false false R72.htm 9955556 - Disclosure - Consolidated Company-Sponsored Investment Funds - Summary of Offsetting of Derivative Assets and Liabilities (Details) Sheet http://www.abglobal.com/role/ConsolidatedCompanySponsoredInvestmentFundsSummaryofOffsettingofDerivativeAssetsandLiabilitiesDetails Consolidated Company-Sponsored Investment Funds - Summary of Offsetting of Derivative Assets and Liabilities (Details) Details 72 false false R73.htm 9955557 - Disclosure - Units Outstanding (Details) Sheet http://www.abglobal.com/role/UnitsOutstandingDetails Units Outstanding (Details) Details http://www.abglobal.com/role/UnitsOutstandingTables 73 false false R74.htm 9955558 - Disclosure - Debt (Details) Sheet http://www.abglobal.com/role/DebtDetails Debt (Details) Details http://www.abglobal.com/role/Debt 74 false false R75.htm 9955559 - Disclosure - Business Segment Information - Additional Information (Details) Sheet http://www.abglobal.com/role/BusinessSegmentInformationAdditionalInformationDetails Business Segment Information - Additional Information (Details) Details 75 false false R76.htm 9955560 - Disclosure - Business Segment Information - Summary of Net Revenues Derived From Investment Management, Research and Related Services (Details) Sheet http://www.abglobal.com/role/BusinessSegmentInformationSummaryofNetRevenuesDerivedFromInvestmentManagementResearchandRelatedServicesDetails Business Segment Information - Summary of Net Revenues Derived From Investment Management, Research and Related Services (Details) Details 76 false false R77.htm 9955561 - Disclosure - Business Segment Information - Summary of Net Revenues and Long-Lived Assets, Related To Geographic Areas (Details) Sheet http://www.abglobal.com/role/BusinessSegmentInformationSummaryofNetRevenuesandLongLivedAssetsRelatedToGeographicAreasDetails Business Segment Information - Summary of Net Revenues and Long-Lived Assets, Related To Geographic Areas (Details) Details 77 false false R78.htm 9955562 - Disclosure - Divestitures (Details) Sheet http://www.abglobal.com/role/DivestituresDetails Divestitures (Details) Details http://www.abglobal.com/role/Divestitures 78 false false All Reports Book All Reports ab-20260331.htm ab-20260331.xsd ab-20260331_cal.xml ab-20260331_def.xml ab-20260331_lab.xml ab-20260331_pre.xml http://fasb.org/srt/2025 http://fasb.org/us-gaap/2025 http://xbrl.sec.gov/dei/2025 http://xbrl.sec.gov/ecd/2025 true true