75000 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 75010 - Statement - Consolidated Statements of Financial Condition (Unaudited) link:presentationLink link:calculationLink link:definitionLink 75020 - Statement - Consolidated Statements of Income (Unaudited) link:presentationLink link:calculationLink link:definitionLink 75030 - Statement - Consolidated Statements of Income (Unaudited) 2 link:presentationLink link:calculationLink link:definitionLink 75040 - Statement - Consolidated Statements of Income (Unaudited) (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 75050 - Statement - Consolidated Statements of Changes in Partnership Capital And Profits Interests Subject to Mandatory Redemption (Unaudited) link:presentationLink link:calculationLink link:definitionLink 75060 - Statement - Consolidated Statements of Comprehensive Loss (Unaudited) link:presentationLink link:calculationLink link:definitionLink 75070 - Statement - Consolidated Statements of Cash Flows (Unaudited) link:presentationLink link:calculationLink link:definitionLink 995455 - Disclosure - Introduction and Basis of Presentation link:presentationLink link:calculationLink link:definitionLink 995465 - Disclosure - Leases link:presentationLink link:calculationLink link:definitionLink 995475 - Disclosure - Receivables and Revenue link:presentationLink link:calculationLink link:definitionLink 995485 - Disclosure - Segment Information link:presentationLink link:calculationLink link:definitionLink 995495 - Disclosure - Fair Value link:presentationLink link:calculationLink link:definitionLink 995505 - Disclosure - Lines of Credit link:presentationLink link:calculationLink link:definitionLink 995515 - Disclosure - Partnership Capital Subject to Mandatory Redemption link:presentationLink link:calculationLink link:definitionLink 995525 - Disclosure - Net Capital Requirements link:presentationLink link:calculationLink link:definitionLink 995535 - Disclosure - Contingencies link:presentationLink link:calculationLink link:definitionLink 995545 - Disclosure - Offsetting Assets and Liabilities link:presentationLink link:calculationLink link:definitionLink 995555 - Disclosure - Cash Flow Information link:presentationLink link:calculationLink link:definitionLink 995565 - Disclosure - Introduction and Basis of Presentation (Policies) link:presentationLink link:calculationLink link:definitionLink 995575 - Disclosure - Leases (Tables) link:presentationLink link:calculationLink link:definitionLink 995585 - Disclosure - Receivables and Revenue (Tables) link:presentationLink link:calculationLink link:definitionLink 995595 - Disclosure - Segment Information (Tables) link:presentationLink link:calculationLink link:definitionLink 995605 - Disclosure - Fair Value (Tables) link:presentationLink link:calculationLink link:definitionLink 995615 - Disclosure - Lines of Credit (Tables) link:presentationLink link:calculationLink link:definitionLink 995625 - Disclosure - Partnership Capital Subject to Mandatory Redemption (Tables) link:presentationLink link:calculationLink link:definitionLink 995635 - Disclosure - Net Capital Requirements (Tables) link:presentationLink link:calculationLink link:definitionLink 995645 - Disclosure - Offsetting Assets and Liabilities (Tables) link:presentationLink link:calculationLink link:definitionLink 995655 - Disclosure - Cash Flow Information (Tables) link:presentationLink link:calculationLink link:definitionLink 995665 - Disclosure - Introduction and Basis of Presentation - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 995675 - Disclosure - Leases - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 995685 - Disclosure - Leases - Schedule of Lease Cost (Details) link:presentationLink link:calculationLink link:definitionLink 995695 - Disclosure - Leases - Schedule of Future Undiscounted Cash Outflows for Operating Leases (Details) link:presentationLink link:calculationLink link:definitionLink 995705 - Disclosure - Receivables and Revenue - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 995715 - Disclosure - Receivables and Revenue - Schedule of Partnership's Disaggregated Revenue (Detail) link:presentationLink link:calculationLink link:definitionLink 995725 - Disclosure - Segment Information - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 995735 - Disclosure - Segment Information - Financial Information for Partnership's Reportable Segments (Detail) link:presentationLink link:calculationLink link:definitionLink 995745 - Disclosure - Fair Value - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 995755 - Disclosure - Fair Value - Partnership's Financial Assets and Liabilities at Fair Value (Detail) link:presentationLink link:calculationLink link:definitionLink 995765 - Disclosure - Line of Credit - Schedule Of Line Of Credit Facilities (Details) link:presentationLink link:calculationLink link:definitionLink 995775 - Disclosure - Line of Credit - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 995785 - Disclosure - Partnership Capital Subject to Mandatory Redemption - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 995795 - Disclosure - Partnership Capital Subject to Mandatory Redemption - Roll Forward of Outstanding Partnership Loans (Detail) link:presentationLink link:calculationLink link:definitionLink 995805 - Disclosure - Net Capital Requirements - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 995815 - Disclosure - Net Capital Requirements - Partnership's Capital Figures for U.S. and Canada Broker-Dealer Subsidiaries (Detail) link:presentationLink link:calculationLink link:definitionLink 995825 - Disclosure - Contingencies - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 995835 - Disclosure - Offsetting Assets and Liabilities - Schedule of Partnership's Securities Purchased Under Agreement to Resell (Detail) link:presentationLink link:calculationLink link:definitionLink 995845 - Disclosure - Offsetting Assets and Liabilities - Schedule of Partnership's Securities Purchased Under Agreement to Resell (Parenthetical) (Detail) link:presentationLink link:calculationLink link:definitionLink 995855 - Disclosure - Cash Flow Information - Schedule of Supplemental Cash Flow Information (Detail) link:presentationLink link:calculationLink link:definitionLink 995865 - Disclosure - Cash Flow Information - Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash Balance (Detail) link:presentationLink link:calculationLink link:definitionLink Profits Interests Issued Profits Interests Issued Partnership granted and issued Profits Interests Schedule of Supplemental Cash Flow Information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Fund sub-adviser fees Subadvisory Fees for Mutual Funds Concentration Risk Type Concentration Risk Type [Axis] Schedule Of Revenues From External Customers And Long Lived Assets [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Partnership's Financial Assets and Liabilities at Fair Value Non-cash activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Entity Current Reporting Status Entity Current Reporting Status Class of Financing Receivable [Axis] Roll Forward of Outstanding Partnership Loans Schedule Of Partnership Loans Outstanding Roll Forward Table [Text Block] Tabular disclosure of the roll forward of outstanding partnership loans. US Government Agencies Debt Securities [Member] Government and Agency Obligations [Member] Municipal Bonds [Member] Municipal Obligations [Member] Operating expenses: Operating Expenses [Abstract] Level II [Member] Fair Value, Inputs, Level 2 [Member] Receivables And Revenue [Table] Receivables And Revenue [Table] Receivables and revenue. Product and Service Product and Service [Axis] Net receivable from brokers, dealers and clearing organizations Increase (Decrease) in Receivable from Broker-Dealer and Clearing Organization Investments segregated under federal regulations: Investments Segregated Under Federal Regulations [Abstract] Investments segregated under federal regulations. Document Fiscal Period Focus Document Fiscal Period Focus Debt Instrument Interest Rate Stated Percentage Debt Instrument, Interest Rate, Stated Percentage Revenue from Contract with Customer [Abstract] Entity Shell Company Entity Shell Company Legal Entity of Counterparty, Type [Axis] Cash and cash equivalents Cash and Cash Equivalent Cash and Cash Equivalents, at Carrying Value, Total Cash and Cash Equivalents, at Carrying Value, Beginning Balance Cash and Cash Equivalents, at Carrying Value, Ending Balance Asset Class Asset Class [Domain] Statement [Table] Statement [Table] 2018 Limited Partnership Offering [Member] Two Thousand Eighteen Limited Partnership Offering [Member] Two thousand eighteen limited partnership offering. Right-of-use assets obtained in exchange for operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Proceeds from Lines of Credit [Abstract] Partners' Capital Notes [Abstract] Statement [Line Items] Statement [Line Items] Total inventory securities Inventory securities Debt Securities, Trading, and Equity Securities, FV-NI Debt Securities, Trading, and Equity Securities, FV-NI, Total Entity Filer Category Entity Filer Category Payables and Accruals [Abstract] Payables to Accrued compensation and employee benefits Increase (Decrease) in Employee Related Liabilities Increase (Decrease) in Employee Related Liabilities, Total Statement of Partners' Capital [Abstract] Foreign currency translation Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent, Total Securities purchased under agreements to resell, Gross amounts not offset in the Consolidated Statements of Financial Condition, Securities collateral Security Purchased under Agreement to Resell, Subject to Master Netting Arrangement, Collateral, Obligation to Return Security Not Offset Distributions Distributions Partners Capital Account Net Distributions Total distributions to each class of partners (i.e. general, limited and preferred partners) net of prior year reserve for anticipated withdrawals. Total cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Percentage of interest made by partnership to general partners General Partner Loan Minimum Interest Rate Offered By Partnership General partner loan minimum interest rate offered by partnership. Regulatory Assets. Regulatory Assets [Abstract] Geographical Geographical [Domain] Partnership [Member] Limited partnership interest value Limited Partnership Interest Value Per Unit The per unit price of limited partnership interest, which represents the book value of each interest and has been arbitrarily determined. Disaggregation Of Revenue [Table] Disaggregation of Revenue [Table] Equities [Member] Equity Securities [Member] Class A Limited Partner [Member] Class A Limited Partner [Member] Class A Limited Partner [Member] Schedule of Partnership's Disaggregated Revenue Disaggregation of Revenue [Table Text Block] Limited partnership's minimum return, value Limited Partnership Minimum Return Value Amount of return on the face amount of limited partnership capital for the reporting period. Inventory securities: Inventory Securities [Abstract] Inventory securities. Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Lessee, Operating Lease, Liability, to be Paid, Year Five 2030 Revenues From External Customers And Long Lived Assets [Line Items] Revenues from External Customers and Long-Lived Assets [Line Items] Limited partnership interest issued. Limited Partnership Interest Issued Limited partnership interests issued Two Thousand Twenty One Limited Partnership Offering Two Thousand Twenty One Limited Partnership Offering [Member] Two Thousand Twenty One Limited Partnership Offering [Member] Consolidation Items [Domain] Weighted average $1,000 equivalent limited partnership units outstanding Weighted Average Limited Partnership Units Outstanding, Basic Partners Capital Account [Line Items] Partners Capital Account [Line Items] Partner’s capital account. Entity Small Business Entity Small Business Receivable from clients balance Revenue From Contract With Customer Receivables Revenue from contract with customer receivables. Home office operating expenses Home office operating expenses Home office operating expense Offsetting [Abstract] Investment Securities [Abstract] Investment securities. Securities owned: Organization, Consolidation and Presentation of Financial Statements [Abstract] Leases [Abstract] Total investments segregated under federal regulations Investments Segregated Under Federal Regulations Investments segregated under federal regulations. Amendment Flag Amendment Flag Product and Service Product and Service [Domain] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Net Capital Requirements [Table] Net Capital Requirements [Table] Net capital requirements. Entity Address, Postal Zip Code Entity Address, Postal Zip Code Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Net cash (used in) provided by operating activities Profits Interests Notional Capital Registered Profits Interests Notional Capital Registered Profits Interests Notional Capital Registered Lessee, Operating Lease, Liability, to be Paid, Year Three 2028 Offsetting Assets And Liabilities [Text Block] The entire disclosure for offsetting assets and liabilities. OFFSETTING ASSETS AND LIABILITIES Net capital after anticipated capital withdrawals, as a percentage of aggregate debit items Net Capital After Anticipated Capital Withdrawals To Aggregate Debit Items Percentage Net capital after anticipated capital withdrawals to aggregate debit items percentage. Receivables and Revenue Receivables And Revenue [Text Block] Receivables and revenue. Entity Address, Address Line One Entity Address, Address Line One Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Axis] Total investment securities Investment securities Financial Instruments, Owned, at Fair Value Financial Instruments, Owned, at Fair Value, Total Securities owned Increase Decrease In Securities Owned Net The net change during the reporting period in the aggregate fair value of securities owned, including inventory securities and investment securities. Foreign Currency Transactions and Translations Policy [Policy Text Block] Foreign Exchange Variable Compensation Amount of variable compensation expensed during the reporting period. Variable compensation Investment Type Investment Type [Axis] Lease right-of-use assets Operating Lease, Right-of-Use Asset Commissions [Member] Commissions [Member] Commissions. Securities purchased under agreements to resell, Gross amounts of recognized assets Security Purchased under Agreement to Resell, Subject to Master Netting Arrangement, before Offset Total liabilities before partnership capital Net Liabilities Before Partnership Capital Sum of the carrying amounts as of the balance sheet date of all liabilities before partnership capital that are recognized. Document Type Document Type Brokers, dealers and clearing organizations Broker-Dealer, Payable to Other Broker-Dealer and Clearing Organization Broker-Dealer, Payable to Other Broker-Dealer and Clearing Organization, Total Entity Central Index Key Entity Central Index Key Line of Credit Facility [Table] Expected credit loss for receivables from clients and securities purchased under agreement to resell. Expected Credit Loss For Receivables From Clients and Securities Purchased under Agreement to Resell Expected credit loss for receivables from clients and securities purchased under agreement to resell Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Net decrease in cash, cash equivalents and restricted cash Subsequent Event Type [Domain] Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total Other comprehensive loss allocations Comprehensive income (loss) before allocations LIABILITIES: Liabilities [Abstract] Mutual funds, insurance companies and other Receivable From Mutual Funds Insurance Companies And Other Amount due from mutual funds, insurance companies and other for fees and charges arising from transactions related to the entity's brokerage activities and operations. Receivable from mutual fund, insurance companies and other Branch office operating expense Branch office operating expenses Branch office operating expenses Issuance of partnership interests Partners' Capital Account, Contributions Redemption of partnership interests Redemption Of Partnership Interests The amount of partnership interests redeemed during the reporting period. Supplemental Cash Flow Elements [Abstract] Subordinated limited partners Net Income Loss Allocated To Subordinated Limited Partners Aggregate amount of net income allocated to subordinated limited partners. Subordinated limited partners Payments for Legal Settlements Penalty paid against settlement Ownership [Domain] Current Fiscal Year End Date Current Fiscal Year End Date Document Quarterly Report Document Quarterly Report Other operating expenses Other Cost and Expense, Operating Other Cost and Expense, Operating, Total Offsetting Securities Purchased under Agreements to Resell [Abstract] Receivables from: Receivables [Abstract] Entity Address, State or Province Entity Address, State or Province Limited partnership's minimum annual return rate Limited Partnerships Minimum Annual Payment Rate The minimum annual return rate on the face amount of limited partnership capital. Comprehensive Income (Loss), Net of Tax, Attributable to Parent Total comprehensive loss Total comprehensive income Subordinated Limited Partnership Capital [Member] Subordinated Limited Partnership Capital [Member] Subordinated limited partnership capital. Geographical Geographical [Axis] Professional and consulting fees Professional Fees Collateral held for securities purchased under agreements to resell Securities Purchased under Agreements to Resell, Fair Value of Collateral Net Capital Requirements [Line Items] Net Capital Requirements [Line Items] Net capital requirements. Subsequent Event [Member] Client Fractional Shares Redemption Obligations. Client Fractional Shares Redemption Obligations Client Fractional Shares Redemption Obligations Cash and Securities Segregated under Federal and Other Regulations Cash and Securities Segregated under Federal and Other Regulations, Total Cash and investments segregated under federal regulations Outstanding amount of partner loans financed through the Partnership Partnership Loans Outstanding Amount of partnership loans outstanding as of the reporting date. Partnership loans outstanding Partnership loans outstanding Partnership loans outstanding Partnership loans outstanding Partnership loans outstanding Accounts payable, accrued expenses and other: Accounts Payable and Accrued Liabilities [Abstract] Finite-Lived Intangible Assets, Major Class Name [Domain] Total bank lines of credit Total bank lines of credit Total bank lines of credit Asset-based Fee Revenue [Member] Asset Based Fee Revenue [Member] Asset-based fee revenue. Reserve for anticipated withdrawals Reserve for anticipated withdrawals Reserve for anticipated withdrawals Partnership Capital Subject To Mandatory Redemption Reserve For Anticipated Withdrawals Amount of partnership capital reserved for anticipated withdrawals. Reserve for anticipated withdrawals Reserve for anticipated withdrawals Reserve for anticipated withdrawals Cash and Cash Equivalents Cash and Cash Equivalents [Domain] Minimum [Member] Minimum [Member] Financial Instrument Financial Instrument [Axis] Level III [Member] Fair Value, Inputs, Level 3 [Member] Segment Reporting [Abstract] Cash Repayment Of Partnership Loans Cash Repayment Of Partnership Loans Repayment of partnership loans Leases Disclosure [Text Block] Leases Disclosure [Text Block] Leases Commitments and Contingencies Contingencies (Note 8) Securities purchased under agreements to resell, Gross amounts offset in the Consolidated Statements of Financial Condition Securities Purchased Under Agreements To Resell Gross Amounts Offset Securities purchased under agreements to resell gross amounts offset. Lease liabilities Total present value of lease liabilities Operating Lease, Liability Operating Lease, Liability, Total Increase Decrease In Securities Purchased Under Agreements To Resell Increase Decrease In Securities Purchased Under Agreements To Resell Securities purchased under agreements to resell Expected credit loss for receivables from contracts with customers Expected Credit Loss For Receivables From Contracts With Customers Expected credit loss for receivables from contracts with customers. Depreciation and amortization Depreciation, Amortization and Accretion, Net Depreciation, Amortization and Accretion, Net, Total Trade Revenue [Member] Trade Revenue [Member] Trade revenue. Concentration Risk Benchmark Concentration Risk Benchmark [Axis] Line of Credit Facility [Abstract] Interest and dividends Interest and Dividend Income, Operating Interest and Dividend Income, Operating, Total Total partnership capital, including capital financed with partnership loans, net of reserve for anticipated withdrawals Partnership Capital Including Capital Financed With Partnership Loans Net Of Reserve For Anticipated Withdrawals Partnership capital including capital financed with partnership loans net of reserve for anticipated withdrawals. Receivable from mutual funds, insurance companies and other Increase Decrease In Receivable From Mutual Funds Insurance Companies And Other The increase (decrease) during the reporting period in the amount due to the entity from mutual funds, insurance companies and other for fees and charges arising from transactions related to the entity's brokerage activities and operations. Receivable from mutual funds, insurance companies and other Receivable from mutual funds, insurance companies and other Loss Contingencies [Table] Loss Contingencies [Table] Receivables And Revenue [Line Items] Receivables And Revenue [Line Items] Receivables and revenue. Lease liabilities Increase Decrease In Lease Liability Increase (decrease) in lease liability. Lease liabilities Uncommitted Secured Credit Facilities [Member] Uncommitted Secured Credit Facilities [Member] Uncommitted secured credit facilities. Uncommitted secured credit facilities Uncommitted secured credit facilities Capital Unit, Class Capital Unit, Class [Domain] Repayment of partnership loans through distributions from partnership capital in the period Non Cash Repayment Of Partnership Loans Non Cash Repayment Of Partnership Loans Net payable to clients Increase (Decrease) in Payables to Customers Net payable to clients Fair Value Fair Value Disclosures [Text Block] Minimum net capital requirements Broker-Dealer, Minimum Net Capital Required, Broker-Dealer Subsidiary, Aggregate Indebtedness Standard United States [Member] UNITED STATES Maximum leverage ratio required to be maintained by partnership Maximum Leverage Ratio Required To Be Maintained By Partnership Maximum leverage ratio required to be maintained by partnership. Cash Solutions Fees Member Cash Solutions Fees Member Net Income Loss Allocated to Profits Interests Net Income Loss Allocated to Profits Interests Profits interests Other assets Increase (Decrease) in Other Operating Assets Increase (Decrease) in Other Operating Assets, Total Interest expense Interest Expense, Operating and Nonoperating Interest Expense, Total Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Mutual Funds [Member] Mutual Fund [Member] Credit Facility [Axis] Certificates of Deposit [Member] Certificates of deposit [Member] Schedule of Line of Credit Facilities [Table Text Block] Schedule Of Line Of Credit Facilities Securities purchased under agreements to resell, Net amounts presented in the Consolidated Statements of Financial Condition Securities purchased under agreements to resell Securities Purchased under Agreements to Resell Net capital Broker-Dealer, Net Capital Broker-Dealer, Net Capital, Total Regulatory risk-adjusted capital in excess of the minimum required Capital In Excess Required To Be Held By Investment Industry Regulatory Organization Of Foreign Country Capital in excess required to be held by investment industry regulatory organization of foreign country. Entity Address, City or Town Entity Address, City or Town Fair value of level III, liabilities Unobservable Inputs Liabilities Fair Value Disclosure Liabilities categorized as level III during the reporting period. Net revenue Revenues, Net of Interest Expense Net revenue Number of reportable segments Number of Reportable Segments Security Exchange Name Security Exchange Name Credit Facility [Domain] Borrowed on Uncommitted Line of Credit Borrowed on uncommitted line of credit. Borrowed on uncommitted line of credit Concentration Risk Type Concentration Risk Type [Domain] Minimum regulatory net capital percentage of debit items Minimum Regulatory Net Capital Percentage Of Debit Items Minimum regulatory net capital percentage of debit items. Limited Partners' Capital Account, Class [Domain] Limited Partners' Capital Account, Class Total cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Beginning Balance Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Ending Balance Total cash, cash equivalents and restricted cash Accounts payable, accrued expenses and other Accounts Payable and Accrued Liabilities Accounts Payable and Accrued Liabilities, Total Profits Interests [Policy Text Block] Profits Interests [Policy Text Block] Profits Interests Statistical Measurement Statistical Measurement [Domain] Notional Capital Outstanding Notional Capital Outstanding Partnership capital subject to mandatory redemption, net of reserve for anticipated withdrawals Partnership capital subject to mandatory redemption, net of reserve for anticipated withdrawals Partnership Capital Subject To Mandatory Redemption Net Of Reserve For Anticipated Withdrawals The amount of ownership interest of different classes of partners in limited partnership subject to mandatory redemption, net of reserve for anticipated withdrawals. Document Period End Date Document Period End Date IncomeLossBeforeAllocations Income before allocations Income Loss Before Allocations Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Domain] Income allocated to limited partners per weighted average $1,000 equivalent limited partnership unit outstanding Net Income (Loss), Per Outstanding Limited Partnership Unit, Basic, Net of Tax Net Income (Loss), Per Outstanding Limited Partnership Unit, Basic, Net of Tax, Total Statement of Financial Position [Abstract] Line of Credit [Member] CASH, CASH EQUIVALENTS AND RESTRICTED CASH: Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation [Abstract] Current estimated profit loss Loss Contingency, Range of Possible Loss, Portion Not Accrued TOTAL LIABILITIES Liabilities Financial Instruments Financial Instruments [Domain] Loss Contingency, Estimate of Possible Loss Profits Interests [Member] Profits Interests Profits Interests [Member] Required minimum partnership capital, net of reserve for anticipated withdrawals and partnership loans Required Minimum Partnership Capital Net Of Reserve For Anticipated Withdrawals And Partnership Loans Required minimum partnership capital net of reserve for anticipated withdrawals and partnership loans. Lessee, Operating Lease, Liability, to be Paid, Year Two 2027 Restricted cash Restricted Cash Restricted Cash, Total Partnership capital subject to mandatory redemption, net of reserve for anticipated withdrawals and partnership loans Partnership Capital Subject To Mandatory Redemption Net Of Reserve For Anticipated Withdrawals And Partnership Loans The amount of ownership interest of different classes of partners in the limited partnership subject to mandatory redemption and net of reserve for anticipated withdrawals and partnership loans. Advertising Expense Advertising Issuance of partnership interests Issuance Of Partnership Interests The amount of partnership interests issued during the period, net of partnership loans. Entity File Number Securities Act File Number Other assets Other Assets Other Assets, Total Cover [Abstract] Capital Units by Class Capital Units by Class [Axis] Accounts payable, accrued expenses and other Increase (Decrease) in Accounts Payable and Accrued Liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities, Total Other Comprehensive Income Allocations Other Comprehensive Income Allocations Other comprehensive income allocations Issuance of general partnership interests through partnership loans in the period Partnership loans issued during the period Partnership Loans Issued Amount of partnership loans issued during the reporting period. Investments Investments [Domain] Sales Revenue Net [Member] Revenue Benchmark [Member] U.S. Treasuries [Member] US Treasury Securities [Member] Number of operating segments Number of Operating Segments Sale of Stock [Domain] Other Comprehensive Loss Allocations Other Comprehensive Loss Allocations Other Comprehensive Loss Allocations Segment Reporting Disclosure [Text Block] Segment Information Net Capital Requirements Broker-Dealer Disclosure [Text Block] Regulatory risk-adjusted capital Foreign Country Brokers Dealers Regulatory Risk Adjusted Capital Foreign country brokers dealers regulatory risk adjusted capital. Clients Broker-Dealer, Payable to Customer Net capital in excess of the minimum required Broker-Dealer, Excess Net Capital, Alternative Standard Broker-Dealer, Excess Net Capital, Alternative Standard, Total Securities purchased under agreements to resell, Net amount Security Purchased under Agreement to Resell, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Receivables From Clients Collateral Receivable From Clients Collateral Receivables from clients collateral Operating Lease, Expense Operating lease, cost Schedule of Future Undiscounted Cash Outflows for Operating Leases Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Account and Activity Fee Revenue [Member] Account And Activity Fee Revenue [Member] Account and activity fee revenue. Repayment of partnership loans Repayment of Partnership loans during the period Repayment of partnership loans through distributions from partnership capital in current period Repayment Of Partnership Loans Amount of partnership loans repaid during the reporting period. Repayment of Partnership loans during the period Ownership [Axis] General Partner Loan Maximum Interest Rate Offered By Partnership General Partner Loan Maximum Interest Rate Offered By Partnership General Partner Loan Maximum Interest Rate Offered By Partnership Amount of partnership capital and profits interests reserved for anticipated withdrawals. Partnership Capital and Profits Interests Subject to Mandatory Redemption Reserve for Anticipated Withdrawals Reserve for anticipated withdrawals Reserve for anticipated withdrawals Introduction and Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Interest income from outstanding amount of general partner loan Interest Income From Outstanding Amount Of General Partner Loan Amount of interest income earned by the partnership on the outstanding amount of partnership loans. Document Transition Report Document Transition Report Total operating expenses Operating Expenses Operating expenses No Trading Symbol Flag No Trading Symbol Flag Limited Partners' Capital Account by Class Limited Partners' Capital Account by Class [Axis] Statement of Cash Flows [Abstract] Committed revolving line of credit Committed revolving line of credits. Committed Revolving Line of Credits Assets, Fair Value Disclosure [Abstract] Contingencies Disclosure [Text Block] CONTINGENCIES Net income Net income Increase Decrease In Investments Segregated Under Federal Regulations Increase Decrease In Investments Segregated Under Federal Regulations Investments segregated under federal regulations Partner Type of Partners' Capital Account, Name Partner Type of Partners' Capital Account, Name [Domain] PARTNERSHIP CAPITAL SUBJECT TO MANDATORY REDEMPTION Partners' Capital Notes Disclosure [Text Block] Operating Lease, Cost Operating lease cost 2018 Credit Facility 2018 Credit Facility Income before allocations margin Income before allocations margin Income before allocations margin Line of Credit Facility [Line Items] Cash paid for operating leases Operating Lease, Payments ASSETS: Assets [Abstract] Partner Type Partner Type [Axis] Percentage of aggregate debit items arising from customer transactions to maintain minimum net capital requirements Percentage Of Aggregate Debit Items Arising From Customer Transactions To Maintain Minimum Net Capital Percentage of aggregate debit items arising from customer transactions required to be maintained by entity's broker-dealer subsidiary to maintain minimum net capital. Fair value of level III, assets Unobservable Inputs Assets Fair Value Disclosure Assets categorized as level III during the reporting period. Document Fiscal Year Focus Document Fiscal Year Focus Concentration Risk Benchmark Concentration Risk Benchmark [Domain] CASH FLOWS FROM INVESTING ACTIVITIES: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] General Partnership Capital [Member] General partnership capital. General Partnership Capital [Member] Customer Securities for which Entity has Right to Sell or Repledge, Fair Value Receivables from clients collateral Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest Limited Partnership Capital Partnership's Capital Figures for U.S. and Canada Broker-Dealer Subsidiaries Broker-Dealer, Net Capital Requirement, SEC Regulation [Table Text Block] Fair Value Disclosures [Abstract] Commitments and Contingencies Disclosure [Abstract] Canada [Member] CANADA Offsetting Assets [Table Text Block] Schedule of Partnership's Securities Purchased Under Agreement to Resell Lessee, Operating Lease, Liability, to be Paid, Year One 2026 Two Thousands and Twenty Two Credit Facility [Member] Two Thousands and Twenty Two Credit Facility [Member] 2022 Credit Facility [Member] Cash Flow Information Cash Flow, Supplemental Disclosures [Text Block] Lessee, Operating Lease, Liability, to be Paid, after Year Five Thereafter Sale of Stock [Axis] Total revenue Revenues Cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Private Placement [Member] Title of 12(b) Security Title of 12(b) Security Accrued compensation and employee benefits Employee-related Liabilities Employee-related Liabilities, Total Net interest and dividends revenue Investment Income, Net Investment Income, Net, Total Money Market Funds [Member] Money Market Funds [Member] Net interest and dividends and other revenue Net Interest Dividends Other Revenue Net interest and dividend income and other revenue. Amounts outstanding Amounts outstanding Consolidated Entities Consolidated Entities [Axis] Changes in assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value, Recurring and Nonrecurring [Table] Period of loans made by Partnership to general partners Period Of Loans Made By Partnership To General Partners Period of time loans are generally offered by the partnership to those general partners who require financing for some or all of their general partner interests. Income Statement Location Statement of Income Location, Balance [Axis] Clients Receivable from Customer in Brokerage Trading Symbol Trading Symbol Subsequent Event Type [Axis] Customer Contracts [Member] CASH FLOWS FROM FINANCING ACTIVITIES: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Total lease payments Lessee, Operating Lease, Liability, to be Paid Securities owned, at fair value: Financial Instruments, Owned, at Fair Value, by Type, Alternative [Abstract] Less: Interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Asset Class Asset Class [Axis] Brokers, dealers and clearing organizations Receivable from Broker-Dealer and Clearing Organization Receivables from Brokers-Dealers and Clearing Organizations, Total Subsidiaries [Member] Subsidiaries [Member] Amount of limited partnership interests registered for issuance under the Employee Limited Partnership Interest Purchase Plan. Limited Partnership Amount Registered Limited partnership amount registered Statement of Comprehensive Income [Abstract] Other Assets [Abstract] Other Assets: Maximum [Member] Maximum [Member] Statistical Measurement Statistical Measurement [Axis] General partners General partners Net Income (Loss) Allocated to General Partners Financial Advisors Compensation Financial Advisors Compensation FA compensation and benefits Cash equivalents: Cash and Cash Equivalents [Abstract] Legal Entity Type of Counterparty [Domain] Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Other comprehensive income (loss): Partnership Capital And Profits Interests Subject To Mandatory Redemption Partnership Capital And Profits Interests Subject To Mandatory Redemption TOTAL PARTNERSHIP CAPITAL AND PROFITS INTERESTS SUBJECT TO MANDATORY REDEMPTION TOTAL PARTNERSHIP CAPITAL AND PROFITS INTERESTS SUBJECT TO MANDATORY REDEMPTION Total partnership capital and profits interests subject to mandatory redemption Limited Partnership Capital [Member] Limited Partnership Capital [Member] Limited partnership capital. Entity Public Float Other Comprehensive Income Loss Allocated Other Comprehensive Income Loss Allocated Allocations Allocations Lines Of Credit Lines Of Credit [Text Block] Lines of Credit Finite-Lived Intangible Assets by Major Class [Axis] Net Income Loss Allocated Net income allocations Net Income Loss Allocated Entity Registrant Name Entity Registrant Name Securities purchased under agreements to resell, Gross amounts not offset in the Consolidated Statements of Financial Condition, Financial instruments Securities Purchased Under Agreements To Resell Subject To Master Netting Arrangement Elected Not To Be Offset Amount of obligation to return financial instruments collateral under master netting arrangements that have not been offset against securities purchased under agreement to resell. Customer [Member] Customer Concentration Risk [Member] Lessee Disclosure [Abstract] Offsetting Assets And Liabilities [Table] Offsetting Assets And Liabilities [Table] Offsetting assets and liabilities. Consolidated Entities Consolidated Entities [Domain] Limited partners Net Income (Loss) Allocated to Limited Partners Limited partners Partners Capital Account [Table] Partners Capital Account [Table] Partner’s capital account. Entity Limited Partnership Interests Outstanding Entity Common Stock, Shares Outstanding Other Asset-based Fees [Member] Other Asset Based Fees [Member] Other asset-based fees. Consolidation Items [Axis] Purchase of fixed assets Payments to Acquire Property, Plant, and Equipment Payments to Acquire Property, Plant, and Equipment, Total Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash Balance Restrictions on Cash and Cash Equivalents [Table Text Block] TOTAL ASSETS Assets Total assets Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract] Regulatory Capital Requirements Class of Financing Receivable [Domain] Income Statement [Abstract] Lease, Cost [Abstract] Two Thousand Twenty Six Limited Partnership Offering [Member] Two Thousand Twenty Six Limited Partnership Offering [Member] Financial Information for Partnership's Reportable Segments Schedule of Segment Reporting Information, by Segment [Table Text Block] Operating Segments [Member] City Area Code City Area Code Other Account and Activity Fee Revenue [Member] Other Account And Activity Fee Revenue [Member] Other account and activity fee revenue. Total investments segregated under federal regulations Restricted Investments Less: Investments segregated under federal regulations Actual collateral of related assets Securities Purchased Under Agreements To Resell Fair Value Of Underlying Collateral Percentage Securities purchased under agreements to resell fair value of underlying collateral percentage. Net capital as a percentage of aggregate debit items Net Capital To Aggregate Debit Item Percentage Net capital to aggregate debit item percentage. Distributions from partnership capital Payments of Capital Distribution Advisory programs fees. Advisory Programs Fees [Member] Advisory Programs Fees [Member] Line of Credit Facility, Maximum Borrowing Capacity Line of credit facility Variable Lease, Cost Variable lease cost Weighted average remaining lease term in years Operating Lease, Weighted Average Remaining Lease Term Two thousand and eighteen credit facility . 2018 Credit Facility [Member] Two Thousand And Eighteen Credit Facility [Member] Total Fee Revenue [Member] Fee Revenue [Member] Fee revenue. Other Revenue Loss Net Amount of fee and financial service revenue and losses classified as other. Other (loss) revenue, net Total lease cost Lease, Cost Total lease cost Client Fractional Shares Ownership Assets. Client Fractional Shares Ownership Assets Client Fractional Shares Ownership Assets Property, Plant and Equipment, Net Property, Plant and Equipment, Net, Total Fixed assets, at cost, net of accumulated depreciation and amortization Partnership Capital Including Capital Financed With Partnership Loans And Profits Interests Partnership Capital Including Capital Financed With Partnership Loans And Profits Interests Total partnership capital, including capital financed with partnership loans, and profits interests Beginning of period End of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations, Total Cash and Cash Equivalents Cash and Cash Equivalents [Axis] Net Capital Requirements [Abstract] Net capital requirements. Weighted Average Limited Partnership Outstanding Per Unit Weighted Average Limited Partnership Outstanding Per Unit Weighted Average Limited Partnership Outstanding Per Unit Shareholder Accounting Services Fees [Member] Shareholder Accounting Services Fees [Member] Shareholder accounting services fees. Weighted average discount rate Operating Lease, Weighted Average Discount Rate, Percent Level I [Member] Fair Value, Inputs, Level 1 [Member] Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Net cash provided by (used in) financing activities Lease, Cost [Table Text Block] Schedule of Lease Cost Percentage of aggregate debit items arising from customer transaction required to be maintained by entity's broker-dealer subsidiary to maintain minimum net capital. Percentage of Aggregate Debit Items Arising From Customer Transaction To Maintain Minimum Net Capital Percentage of aggregate debit items arising from customer transactions to maintain minimum net capital requirements Expected credit loss on partnership loans Partnership Loans Expected Credit Loss Partnership loans expected credit loss. Corporate Bonds and Notes [Member] Corporate Debt Securities [Member] Entity Interactive Data Current Entity Interactive Data Current Income Statement Location Statement of Income Location, Balance [Domain] CASH FLOWS FROM OPERATING ACTIVITIES: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Principal Transactions [Member] Principal Transactions [Member] Principal transactions. Committed revolving line of credit Committed revolving line of credit Service Fees [Member] Service Fees [Member] Service fees. Communications and data processing Communications and Information Technology Communications and Information Technology, Total Entity Tax Identification Number Entity Tax Identification Number Net revenue: Revenue: Revenues [Abstract] Partnership Income [Abstract] Allocations: Partnership's Financial Assets at Fair Value Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block] Offsetting Assets And Liabilities [Line Items] Offsetting Assets And Liabilities [Line Items] Offsetting assets and liabilities. Occupancy and equipment Occupancy, Net Local Phone Number Local Phone Number Income Before Allocations Income Before Allocations Income before allocations Redemption of partnership interests Redemption of partnership interests Partners' Capital Account, Redemptions Disaggregation Of Revenue [Line Items] Disaggregation of Revenue [Line Items] Revenue Revenue from Contract with Customer, Excluding Assessed Tax Net revenue Total revenue from customers Broker-Dealer [Abstract] Lessee, Operating Lease, Liability, to be Paid, Year Four 2029 Compensation and benefits Labor and Related Expense Entity Emerging Growth Company Entity Emerging Growth Company