Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Award Timing Predetermined Award Timing Predetermined [Flag] Indefinite-lived Intangible Assets Indefinite-Lived Intangible Assets [Axis] Regular Units Regular Unit [Member] Regular unit. Loans, forgivable loans and other receivables from employees and partners, net Increase (Decrease) in Due from Employee, Current Entity File Number Entity File Number Additional Paid-in Capital Additional Paid-in Capital [Member] Tabular List, Table Tabular List [Table Text Block] New Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Shares issued, price per share, after tax (in dollars per share) Dividend Income, Amount Per Share, Net Of Tax Dividend Income, Amount Per Share, Net Of Tax Schedule of Activity Associated with Limited Partnership Units Awarded to BGC Employees Schedule Of Limited Partners Units Redeemed Table [Table Text Block] Schedule of limited partners units redeemed. BGC Group Notes Exchange Offer BGC Group Notes Exchange Offer [Member] BGC Group Notes Exchange Offer Other expenses Other Expenses Adjustment to Compensation: Adjustment to Compensation [Axis] Related Party Transactions Related Party Transactions Disclosure [Text Block] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Revenues from Contracts with Customers Revenue from Contract with Customer [Text Block] Stock, Class of Stock [Table] Stock, Class of Stock [Table] Common Class A, Shares Held in the Personal Asset Trust Common Class A, Shares Held In The Personal Asset Trust [Member] Common Class A, Shares Held In The Personal Asset Trust Intangible Asset, Indefinite-Lived [Table] Intangible Asset, Indefinite-Lived [Table] Equity-based compensation (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Corporate conversion, exchange ratio (in shares) Corporate Conversion, Exchange Ratio Corporate Conversion, Exchange Ratio Adjustment to Compensation, Amount Adjustment to Compensation Amount Concentration risk Concentration Risk, Percentage Other assets Increase (Decrease) in Other Operating Assets Consolidation Consolidation, Policy [Policy Text Block] Employee Stock Option Share-Based Payment Arrangement, Option [Member] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Newmark Holdings Newmark Holdings Newmark Holdings [Member] Newmark Holdings. Cash paid during the period for taxes Income Taxes Paid Antidilutive Securities Antidilutive Securities [Axis] Impairment of fixed assets, intangible assets and investments Asset Impairment Charges Total stockholders’ equity Equity, Attributable to Parent Other comprehensive income (loss), net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Insider Trading Policies and Procedures [Line Items] Schedule of Components of Fixed Assets, Net Property, Plant and Equipment [Table Text Block] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Payables to broker-dealers, clearing organizations, customers and related broker-dealers Increase (Decrease) in Payable to Broker-Dealer and Clearing Organization BGC Partners 3.750% Senior Notes due October 1, 2024 BGC Partners Three Point Seven Five Zero Percent Senior Notes [Member] Three point seven five zero percent senior notes. Net amounts of recognized assets Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Issuance of common stock (in shares) Common stock, issued during the period (in shares) Stock Issued During Period, Shares, New Issues 2031 and thereafter Lessee, Operating Lease, Liability, To Be Paid, After Year Four Lessee, Operating Lease, Liability, To Be Paid, After Year Four Liabilities Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value Liabilities and Equity Liabilities and Equity [Abstract] Payables to related parties Accounts Payable, Other Cover [Abstract] Cover [Abstract] Divestitures Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Maximum Maximum [Member] Less: Net income (loss) attributable to noncontrolling interest in subsidiaries Net Income (Loss) Attributable to Noncontrolling Interest Freedom International Brokerage Freedom International Brokerage [Member] Freedom international brokerage. Net Carrying Amount Finite-Lived Intangible Assets, Net Restricted Shares Restricted Stock [Member] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Granted Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Granted In Period Fair Value Share based compensation arrangement by share based payment award equity instruments other than options granted in period fair value. Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Total notes payable and other borrowings Total notes payable and other borrowings Debt, Long-Term and Short-Term, Combined Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Income (loss) from operations before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Share issuances: Common Stock, Number of Shares, Par Value and Other Disclosure [Abstract] Schedule of Revenue by Major Customers, by Reporting Segments [Table] Schedule of Revenue by Major Customers, by Reporting Segments [Table] Schedule of Carrying Amounts and Estimated Fair Values of Company's Senior Notes Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Proceeds from borrowings Proceeds from Issuance of Debt Finance lease, remaining lease term (in years) Lessee, Finance Lease, Remaining Lease Term Loss Contingency Nature Loss Contingency Nature [Axis] Operating lease, remaining lease term (in years) Lessee, Operating Lease, Remaining Lease Term Less: Comprehensive income (loss) attributable to noncontrolling interest in subsidiaries, net of tax Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Interest expense Interest Expense, Operating Earnings distributions to limited partnership interests and other noncontrolling interests Payments to Noncontrolling Interests Total Operating Lease, Liability, Net Of Payments To Be Received From Sublease Operating Lease, Liability, Net Of Payments To Be Received From Sublease Schedule of Compensation Expense Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Receivables from related parties Other Receivables BGC Group Six Point one Five Percentage Point Senior Notes BGC Group Six Point one Five Percentage Point Senior Notes [Member] BGC Group Six Point one Five Percentage Point Senior Notes Interest on lease liabilities Finance Lease, Interest Expense Software, including software development costs Software and Software Development Costs [Member] Document Fiscal Period Focus Document Fiscal Period Focus Number of units, redeemed (in shares) Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instrument Redeemed Share-based compensation arrangement by share based payment award non option equity instrument redeemed. Award Timing Method Award Timing Method [Text Block] Award Type Award Type [Axis] Percentage of preferred partnership units awarded Percentage Of Preferred Partnership Units Awarded Percentage of net profits of consolidated subsidiary allocated to preferred units. Investment, Name Investment, Name [Domain] Trading Symbol Trading Symbol 2030 Lessee, Operating Lease, Liability, to be Paid, Year Four Number of installments Number Of Installment Number Of Installment Earnings RSAs Earnings RSAs [Member] Earnings RSAs Interest expense recorded Interest Expense, Long-Term Debt Schedule of Components of Other Intangible Assets Schedule of Intangible Assets and Goodwill [Table Text Block] Data, network and post-trade Data Network And Post-trade Revenue Data Network And Post-trade Revenue Entity Address, City or Town Entity Address, City or Town Short-term Debt, Type Short-Term Debt, Type [Domain] BGC Group 4.375% Senior Notes due December 15, 2025 BGC Group Four Point Three Seven Five Percentage Senior Notes [Member] BGC Group Four Point Three Seven Five Percentage Senior Notes Weighted-average discount rate, finance leases (as a percent) Finance Lease, Weighted Average Discount Rate, Percent Preferred Units by Name Preferred Units by Name [Axis] Class of Financing Receivable Class of Financing Receivable [Axis] Schedule of Cash Flow Information Related to Lease Liabilities Schedule Of Cash Flow Information Related To Lease Liabilities Table [Table Text Block] Schedule Of cash flow information related to lease liabilities. Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Income Statement Location Statement of Income Location, Balance [Domain] Accounts receivable acquired, expected allowance for credit losses Business Combination, Acquired Receivable, Purchased without Credit Deterioration, Contractual Cash Flow, Estimated Uncollectible Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Company ownership of Tower Bridge (as a percent) Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Net pending trades Payable To Net pending Trades Payable To Net pending Trades Total purchase price consideration transferred Total purchase price consideration transferred Business Combination, Consideration Transferred Impairment charge on equity method investments Equity Method Investment, Other-than-Temporary Impairment Current Expected Credit Losses (CECL) Credit Loss, Financial Instrument [Text Block] Entity Emerging Growth Company Entity Emerging Growth Company Decrease (increase) in operating assets: Increase (Decrease) in Operating Assets [Abstract] Weighted-average remaining lease term, finance leases (in years) Finance Lease, Weighted Average Remaining Lease Term Contract values of fails to receive Securities Failed-to-Receive Repayment of outstanding borrowings Repayments of Lines of Credit Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Deferred financing cost Debt Issuance Costs, Net Gain (loss), net on derivative contract Derivative, Gain (Loss) on Derivative, Net Total indefinite life intangible assets Indefinite-Lived Intangible Assets (Excluding Goodwill) Interest Finance Lease, Liability, Undiscounted Excess Amount Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Schedule of Revenues from Contracts with Customers and Other Sources of Revenues Disaggregation of Revenue [Table Text Block] Schedule of Changes in Shares of Class A Common Stock Outstanding Schedule of Common Stock Outstanding Roll Forward [Table Text Block] Class of Financing Receivable Class of Financing Receivable [Domain] Other revenues Other Revenues Other revenues. Number of share-equivalent limited partnership units exchangeable into shares (in shares) Number Of Limited Partnership Units Exchangeable Into Shares Number of limited partnership units exchangeable into shares. Deferred compensation expense Deferred Compensation Arrangement with Individual, Compensation Expense Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Guarantee liability Guarantor Obligations, Current Carrying Value Schedule of Estimated Future Amortization Expense of Definite Life Intangible Assets Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Accounts payable, accrued and other liabilities Accounts Payable and Accrued Liabilities Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Accrued compensation Increase (Decrease) in Accrued Salaries Provision (benefit) for income taxes Income Tax Expense (Benefit) Futures Exchange Group Futures Exchange Group [Member] Futures Exchange Group Basis points (less than) Debt Instrument, Basis Spread on Variable Rate Data, network and post-trade Data Software And Post Trade [Member] Data, software and post-trade. Class B Common Stock Common Class B [Member] Other assets Other Assets Assets, fair value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Related party expenses Expense Related to Distribution or Servicing and Underwriting Fees Document Information [Line Items] Document Information [Line Items] Restricted Newmark Stock Restricted Newmark Stock [Member] Restricted Newmark Stock Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Charitable contributions Charitable Contributions Charitable Contributions Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Axis] Revenues: Geographic Areas, Revenues from External Customers [Abstract] Discontinued Operations and Disposal Groups [Abstract] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Less: accumulated depreciation and amortization Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, Accumulated Depreciation and Amortization Payments for acquisitions, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Compensation and employee benefits Cost, Direct Labor All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Redemption price as percentage of principal amount (as a percent) Debt Instrument, Redemption Price, Percentage Outstanding (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Loans, forgivable loans and other receivables from employees and partners, net Business Combination, Recognized Identifiable Assets Acquired, Loans, Forgivable Loans And Other Receivables From Employees And Partners, Net Business Combination, Recognized Identifiable Assets Acquired, Loans, Forgivable Loans And Other Receivables From Employees And Partners, Net Net cash provided by (used in) operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Restricted stock forfeitures (in shares) Restricted stock forfeitures (in shares) Shares, forfeited (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Forfeited Repayment of short-term borrowings from related parties Repayments of Short-Term Debt Maturity term maximum Debt Instrument, Term Equity Method Investments and Joint Ventures [Abstract] Equity Method Investments and Joint Ventures [Abstract] Subsequent Event Subsequent Event [Member] Revenues from External Customers and Long-Lived Assets [Line Items] Revenues from External Customers and Long-Lived Assets [Line Items] Equity-based compensation and allocations of net income to limited partnership units Equity-based compensation and allocations of net income to limited partnership units Equity Based Compensation And Allocation Of Net Income To Limited Partnership Units And Founding Partner Units Equity based compensation and allocation of net income to limited partnership units and founding working units. Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Long-term Debt, Type Long-Term Debt, Type [Axis] 2030 Finance Lease, Liability, to be Paid, Year Four 2026 (excluding the three months ended March 31, 2026) Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year Gross amounts, liabilities Derivative Liability, Subject to Master Netting Arrangement, before Offset Equity Components Equity Components [Axis] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Contingent consideration, liability, measurement input Business Combination, Contingent Consideration, Liability, Measurement Input Number of reportable segments Number of Reportable Segments Software development costs capitalized Capitalized Computer Software, Additions Financial instruments owned, at fair value—Equities Financial Instruments, Owned, Corporate Equities, at Fair Value Entity Address, State or Province Entity Address, State or Province Financing cash flows from finance lease liabilities Finance Lease, Principal Payments Interest and dividend income Interest and Dividend Income, Operating Antidilutive Security, Excluded EPS Calculation [Table] Antidilutive Security, Excluded EPS Calculation [Table] Dividends to common stockholders and participating RSU holders Dividends, Common Stock Commissions and floor brokerage Floor Brokerage, Exchange and Clearance Fees Financial instruments owned, at fair value Aggregate securities owned Financial Instruments, Owned, at Fair Value Domain name Internet Domain Names [Member] Individual: Individual [Axis] Fixed assets, gross Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, before Accumulated Depreciation and Amortization Remaining liability associated with charitable contributions Remaining Liability Related To Charitable Contributions Remaining liability related to charitable contributions. Dividends to stockholders Payments of Ordinary Dividends, Common Stock N Units Non Distributing Partnership Units [Member] Non-distributing partnership units. Maximum exposure to loss Maximum Exposure to Loss Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Lease renewal term, finance lease (in years) Lessee, Finance Lease, Renewal Term Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Ownership percentage by noncontrolling owners (as a percent) Subsidiary, Ownership Percentage, Noncontrolling Owner Entity Interactive Data Current Entity Interactive Data Current Loss Contingency, Nature Loss Contingency, Nature [Domain] Business Combination, Contingent Consideration, Type Business Combination, Contingent Consideration, Type [Axis] Financial instruments owned, at fair value—Domestic government debt Marketable Securities Conversion right (in shares) Convertible Preferred Stock, Shares Issued upon Conversion Long-Lived Tangible Asset Long-Lived Tangible Asset [Axis] Ownership Ownership [Domain] 2028 Finance Lease, Liability, to be Paid, Year Two Fails and Pending Trades with Cantor Fails and Pending Trades with Cantor [Member] Fails and Pending Trades with Cantor Entity Central Index Key Entity Central Index Key PEO Name PEO Name Asset retirement obligations Asset Retirement Obligation Total revenues Total revenues Revenues Fees from related parties Fees From Related Parties Revenue Fees from related parties revenue. Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] FX swaps Currency Swap [Member] Common Class A, Shares Held Directly By Howard W. Lutnick Common Class A, Shares Held Directly By Howard W. Lutnick [Member] Common Class A, Shares Held Directly By Howard W. Lutnick Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Fair Value Amount Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Fair Value Outstanding [Roll Forward] Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Fair Value Outstanding Opening balance, liabilities Closing balance, liabilities Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Schedule of Basic Earnings Per Share Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table Text Block] BGC Group 6.150% Senior Notes due April 2, 2030 BGC Group Six Point One Five Zero Percentage Senior Notes [Member] BGC Group Six Point One Five Zero Percentage Senior Notes BGC Partners 4.375% Senior Notes due December 15, 2025 Four Point Three Seven Five Percentage Senior Notes [Member] Four point three seven five percentage senior notes. Accrued compensation Business Combination, Recognized Liability Assumed, Accrued Compensation Business Combination, Recognized Liability Assumed, Accrued Compensation Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Netting and Collateral Derivative Asset, Subject to Master Netting Arrangement, Gross Liability and Collateral, Obligation to Return Cash, Offset Change in estimated acquisition earn-out payables Change In Estimated Acquisition Earnout Payables Change in estimated acquisition earn-out payables. Schedule of Fair Value of Derivative Contracts Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Class of Stock Class of Stock [Domain] Unrecognized compensation expense related to unvested Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Subsequent Event Type Subsequent Event Type [Axis] Schedule of Lease Expense [Line Items] Schedule Of Lease Expense [Line Items] Schedule Of Operating Lease Expense. Loss contingency accrual, provision Loss Contingency Accrual, Provision Other receivables from broker-dealers and customers Other Receivable from Broker-Dealer and Clearing Organization Notes payable and other borrowings Long-Term Debt, Excluding Current Maturities Senior Revolving Credit Facility Senior Revolving Credit Facility [Member] Senior revolving credit facility. 2029 Finite-Lived Intangible Asset, Expected Amortization, Year Three Balance Sheet Location Statement of Financial Position Location, Balance [Axis] Lease renewal increments term, operating lease (in years) Lessee, Operating Lease, Renewal Increments Term Lessee operating lease renewal increments term. Gross Amount Finite-Lived Intangible Assets, Gross Shares held by related party, number of shares sold (in shares) Shares Held By Related Party, Sold, Share Shares Held By Related Party, Sold, Share Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Entity Address, Address Line One Entity Address, Address Line One Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Shares withheld to satisfy tax liabilities (in shares) Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] Ownership Ownership [Axis] Derivatives Derivative Instruments and Hedging Activities Disclosure [Text Block] Compensation arrangements with future service requirements Less: compensation arrangements with required future service periods Business Combination, Contingent Consideration, Compensation Expense For Future Services Business Combination, Contingent Consideration, Compensation Expense For Future Services Fair Value as of Grant Date Award Grant Date Fair Value Nature of Expense Nature of Expense [Axis] Preferred Units, Class Preferred Units, Class [Domain] Add back: Allocations of undistributed earnings to participating securities Net Income (Loss) Allocated to Participating Securities Net Income (Loss) Allocated to Participating Securities Underwriting fees Underwriting Fees [Member] Underwriting fees. Derivative Instruments and Hedging Activities Disclosures [Table] Derivative Instruments and Hedging Activities Disclosures [Table] Shares granted in period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Title and Position Title and Position [Domain] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Document Quarterly Report Document Quarterly Report Fair Value Long-Term Debt, Fair Value Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Counterparty Name Counterparty Name [Domain] 2028 Lessee, Operating Lease, Liability, to be Paid, Year Two Net pending trades Receivable From Net Pending Trades Receivable from net pending trades. Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Accrued commissions and other receivables, net Accrued Commissions And Other Receivables Net [Member] Accrued commissions and other receivables, net. Accounts payable accrued and other liabilities [extensible list] Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] Total equity method and investments carried under measurement alternative Investments Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Cash Payments to Acquire Businesses, Gross Non-PEO NEO Non-PEO NEO [Member] All other Other Intangible Assets [Member] Beginning balance Ending balance Current expected credit losses reserve Financing Receivable, Allowance for Credit Loss BGC Partners 8.000% Senior Notes due May 25, 2028 BGC Partners Eight Point Zero Percentage Senior Notes [Member] BGC Partners Eight Point Zero Percentage Senior Notes Award Type Award Type [Domain] 2027 Lessee, Operating Lease, Liability, to be Paid, Year One Noncontrolling interest in subsidiaries Equity, Attributable to Noncontrolling Interest Equity Awards Adjustments Equity Awards Adjustments [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Other revenues Other Income Accrued commissions receivable, net Increase (Decrease) in Accounts and Other Receivables Compensation Amount Outstanding Recovery Compensation Amount Debt Instrument, Name Debt Instrument, Name [Domain] Value of shares withheld Value Of Share Withholding For Tax Share Based Compensation Value of shares withheld for tax, related to share-based compensation. BGC Group 3.750% Senior Notes due October 1, 2024 BGC Group Three Point Seven Five Zero Percent Senior Notes [Member] BGC Group Three Point Seven Five Zero Percent Senior Notes Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Offsetting Assets [Table] Offsetting Assets [Table] Schedule of Weighted-Average Remaining Lease Term and Discount Rate Lessee Weighted Average Remaining Lease Term And Discount Rate Table [Table Text Block] Lessee, operating weighted average remaining lease term and discount rate. Accrued rent Accrued Rent Mr. Stephen Merkel Mr. Stephen Merkel [Member] Mr. Stephen Merkel Contract values of fails to deliver Securities Failed-to-Deliver Schedule of Investments [Line Items] Schedule of Investments [Line Items] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Revenues: Revenues [Abstract] 2026 (excluding the three months ended March 31, 2026) Finance Lease, Liability, to be Paid, Remainder of Fiscal Year Other comprehensive income (loss) on level 3 assets / liabilities outstanding Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Net Unrealized Gain Loss Included In Other Comprehensive Income Loss Fair value measurement with unobservable inputs reconciliation recurring basis liability net unrealized gain loss included in other comprehensive income (loss). Fixed assets, net [extensible list] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Mark-up cost of services (as a percent) Markup On Cost Percentage mark-up charged to related party for cost of administrative services, technology services or other support. Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Payables to clearing organizations Commission Payable to Broker-Dealer and Clearing Organization EMEA EMEA [Member] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Open Derivative Contracts with Cantor Open Derivative Contracts with Cantor [Member] Open Derivative Contracts with Cantor Finite-Lived Intangible Assets by Major Class Finite-Lived Intangible Assets by Major Class [Axis] Limited partnership interest, conversion ratio Limited Partnership Interest, Conversion Ratio Limited Partnership Interest, Conversion Ratio Minimum Minimum [Member] Equity-based compensation and allocations of net income to limited partnership units Equity Based Compensation And Allocations Of Net Income To Limited Partnership Units And Founding Or Working Partner Units The aggregate of our equity-based compensation (primarily charges related to the grants of exchangeability to limited partnership units and FPUs) and the allocation of net income to limited partnership units and FPUs which represent the pro rata interest in net income attributable to such partners units based on the weighted-average economic ownership for the period. Number of restricted stock award settled per common stock (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number Of Restricted Stock Award Settled Per Common Stock Share-based Compensation Arrangement by Share-based Payment Award, Number Of Restricted Stock Award Settled Per Common Stock Measurement period adjustments Goodwill, Measurement Period Adjustment Company Selected Measure Name Company Selected Measure Name Contingent Consideration Contingent Consideration Liability [Member] Contingent Consideration Liability [Member] ECS Brokerage Energy, Commodities and Shipping [Member] Brokerage energy and commodities. Gain (loss) on sale of investments Gain (Loss) on Sale of Investments Notes Payable and Other Borrowings Debt Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Restricted shares, restriction period (in years) Sharebased Compensation Arrangement By Sharebased Payment Award Award Restriction Period Period over which the sale or transferability of an the equity-based payment award is restricted, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Debt instrument, remaining authorized purchase amount Debt Instrument, Remaining Authorized Purchase Amount Debt Instrument, Remaining Authorized Purchase Amount Operating cash flows from operating lease liabilities Operating Lease, Payments Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Service Agreement with Cantor Service Agreement with Cantor [Member] Service Agreement with Cantor Net income (loss) for fully diluted shares Net income (loss) for fully diluted shares Net Income (Loss) Available to Common Stockholders, Diluted Impairment charges Impairment of Intangible Assets (Excluding Goodwill) Goodwill [Roll Forward] Goodwill [Roll Forward] Fully diluted weighted-average shares of common stock outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Conversion, shares issued (in shares) Stock Issued During Period, Shares, Conversion of Units Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Weighted-average remaining contractual term (years) Weighted-Average Remaining Contractual Term (Years) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms Entity Small Business Entity Small Business Percentage of voting interests acquired Business Combination, Voting Equity Interest Acquired, Percentage Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Bank fees related to the agreement Line of Credit Facility, Commitment Fee Amount Common Class A, Shares Held in a Retirement Account Common Class A, Shares Held In A Retirement Account [Member] Common Class A, Shares Held In A Retirement Account Document Transition Report Document Transition Report Other assets [extensible list] Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other assets Business Combination, Recognized Asset Acquired, Other Asset, Noncurrent Total Finance Lease, Liability, to be Paid Underlying Securities Award Underlying Securities Amount Shares held by related party, shares sold, price per share (in dollars per share) Shares Held By Related Party, Sold, Price Per Share Shares Held By Related Party, Sold, Price Per Share Equity Component Equity Component [Domain] Statement of Partners' Capital [Abstract] Statement of Partners' Capital [Abstract] Document Period End Date Document Period End Date Unsecured senior revolving credit agreement Long-Term Line of Credit, Noncurrent Income Taxes Income Tax Disclosure [Text Block] Class A Common Stock Common Class A [Member] UNITED KINGDOM UNITED KINGDOM Vesting of RSUs (in shares) Stock Issued During Period Shares Restricted Stock Award Vested Stock issued during period shares restricted stock award vested. Payments on acquisition earn-outs Payment for Contingent Consideration Liability, Financing Activities Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] ROU assets and liabilities Right Of Use Assets And Liabilities Right-of-use assets and liabilities. Schedule of Investments [Table] Schedule of Investments [Table] Weighted-Average Price Paid per Share (in dollars per share) Treasury Stock Acquired Weighted Average Cost Per Share Treasury stock acquired weighted average cost per share. Total equity Beginning balance Ending balance Equity, Including Portion Attributable to Noncontrolling Interest Stock repurchased, weighted average price (in dollars per share) Shares Acquired, Average Cost Per Share Issuance of long-term debt, net of deferred issuance costs Issuance Of Long Term Debt And Collateralized Borrowings Net Of Deferred Issuance Costs Issuance of long-term debt and collateralized borrowings, net of deferred issuance costs. Amortization of discount (premium) on notes payable Amortization of Debt Discount (Premium) Document Type Document Type Limited partnership units outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Balance outstanding (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number Level 3 Fair Value, Inputs, Level 3 [Member] Earnings Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Loss Contingencies [Table] Loss Contingencies [Table] Percentage of preferred partnership units awarded per calendar year Percentage Of Preferred Partnership Units Awarded Per Calendar Year Percentage Of Preferred Partnership Units Awarded Per Calendar Year Selling and promotion Marketing and Advertising Expense Product and Service Product and Service [Axis] Business Combination, Contingent Consideration, Type Business Combination, Contingent Consideration, Type [Domain] Total revenues from contracts with customers Revenue from Contract with Customer, Excluding Assessed Tax Brokers and Dealers [Abstract] Broker-Dealer [Abstract] Statistical Measurement Statistical Measurement [Axis] RSU, RSU Tax Account, and restricted stock amortization RSU amortization Share Based Compensation Arrangement By Share Based Payment Award Restricted Stock Units Amortization Share based compensation arrangement by share based payment award restricted stock units amortization. Stock repurchase program, authorized amount Share Repurchase Program, Authorized, Amount Revenue From Contracts With Customers [Table] Revenue From Contracts With Customers [Table] Revenue from contracts with customers. Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Payments for tax obligations related to equity awards Payment, Tax Withholding, Share-Based Payment Arrangement Regulatory Requirements Broker-Dealer Disclosure [Text Block] Contributions of capital to and from Cantor for equity-based compensation Contributions Of Capital To And From Affiliate For Equity Based Compensation Contributions of capital to and from affiliate for equity based compensation. Accelerated vesting expense Share-Based Payment Arrangement, Accelerated Cost Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Net income (loss) attributable to common stockholders Net income (loss) attributable to common stockholders Net income (loss) attributable to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Schedule of Gains and (Losses) on Derivative Contracts Derivative Instruments, Gain (Loss) [Table Text Block] Total expenses Operating Expenses Line of credit facility, outstanding amount Long-Term Line of Credit Level 1 Fair Value, Inputs, Level 1 [Member] Shares outstanding at beginning of period (in shares) Shares outstanding at end of period (in shares) Shares, Outstanding Notional value with post-termination pay-out amount Notional Value Of Limited Partnership Units With Post Termination Pay Out Amount Notional value of limited partnership units with post termination pay out amount. Gain (loss) on divestitures of investments Gain (Loss) On Divestiture The aggregate of gain (loss) from a divestiture or sale of a business activity, Other issuances of BGC Class A common stock (in shares) Stock Issued During Period, Shares, Other, Net Of Adjustments Stock Issued During Period, Shares, Other, Net Of Adjustments Related Party Transaction [Table] Related Party Transaction [Table] Fully diluted earnings (loss) per share (in dollars per share) Earnings Per Share, Diluted Supplemental non-cash information: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Receivables from broker-dealers, clearing organizations, customers and related broker-dealers Receivables from Brokers-Dealers and Clearing Organizations [Member] Receivables from Brokers-Dealers and Clearing Organizations Treasury stock (in shares) Treasury Stock, Common, Shares Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Variable interest entity Variable Interest Entity, Not Primary Beneficiary [Member] Compensation expense related to employee loans Employee Loan Expense The compensation expense recognized during the period related to employee loans. Investments Equity Method Investments and Joint Ventures Disclosure [Text Block] Employee loan amortization and reserves on employee loans Employee Loan Amortization And Reserve On Employee Loans Employee Loan Amortization and Reserve On Employee Loans Guarantees Guarantees [Member] Other Stockholders' Equity, Other Interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Indemnification assets Business Combination, Indemnification Asset, Acquisition Date, Amount 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Two Fixed Assets, Net Property, Plant and Equipment Disclosure [Text Block] Total Lessee, Operating Lease, Liability, to be Paid Fixed assets, net Fixed assets, net Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Trade names Trade Names [Member] Repurchase agreements Securities Sold under Agreements to Repurchase SEC Rules on Climate-Related Disclosures Climate-Related Disclosures, Policy [Policy Text Block] Climate-Related Disclosures, Policy Investment owned, balance (in shares) Investment Owned, Balance, Shares Expiration Date Trading Arrangement Expiration Date Limited partnership interests exchange ratio Limited Partnership Interests Exchange Ratio Limited Partnership Interests Exchange Ratio Accelerated vesting of restricted stock (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Accelerated Vesting, Number Senior Revolving Credit Agreement Senior Revolving Credit Agreement [Member] Senior revolving credit agreement. Equity Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Commissions Commissions [Member] Commissions. Geographic Concentration Risk Geographic Concentration Risk [Member] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Entity Current Reporting Status Entity Current Reporting Status BGC Partners BGC Parnters [Member] BGC Parnters Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Consolidated Entities Consolidated Entities [Domain] Losses (gains) on equity method investments Losses Gains On Equity Method Investments Losses (gains) on equity method investments. Derivative liability Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement Accounts payable, accrued and other liabilities Business Combination, Recognized Liability Assumed, Accounts Payable, Accrued And Other Liabilities Business Combination, Recognized Liability Assumed, Accounts Payable, Accrued And Other Liabilities Restricted Stock Units, Tax Account Restricted Stock Units, Tax Account [Member] Restricted Stock Units, Tax Account Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Executive Category: Executive Category [Axis] Treasury stock repurchases (in shares) Treasury Stock, Shares, Acquired, Including Shares Withheld for Tax Withholding Obligation Treasury Stock, Shares, Acquired, Including Shares Withheld for Tax Withholding Obligation Repayments of debt Repayments of Debt Allocations of net income and dividend equivalents Net Income (Loss) Allocated to Limited Partners Replacement cost of contracts in a gain position Derivative Contract In Gain Position Replacement Cost The replacement cost of derivative contracts in a gain or asset position. Current Fiscal Year End Date Current Fiscal Year End Date Technology Technology-Based Intangible Assets [Member] Finite-Lived Intangible Assets, Major Class Name Finite-Lived Intangible Assets, Major Class Name [Domain] Intra-day overdraft credit line Intra Day Overdraft Credit Line [Member] Intra-day overdraft credit line. Preferred Units Preferred Units [Member] Preferred units. Weighted-Average Grant Date Fair Value Per Share Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Aggregate number of shares grant of future awards (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Professional and consulting fees Professional Fees Assets Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value Net amounts presented in the statements of financial condition, liabilities Derivative Liability Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Share of net profit (loss) from noncontrolling interest Income (Loss) from Continuing Operations, Net of Tax, Attributable to Noncontrolling Interest Advanced Markets Holdings Advanced Markets Holdings [Member] Advanced Markets Holdings [Member] Amount of capital in excess of aggregate regulatory requirements Banking Regulation, Total Risk-Based Capital, Excess, Actual Schedule of Fair Value Hierarchy of Financial Assets and Liabilities under U.S. GAAP Guidance Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Issuance of Class A common stock and RSUs for acquisitions Stock Issued During Period, Value, Acquisitions Net identifiable assets acquired Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less) Anti-dilutive securities excluded from computation of earnings per share amount (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Weighted-average shares: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Purchaser Trusts Purchaser Trusts [Member] Purchaser Trusts Leases Lessee, Operating Leases [Text Block] Net cash provided by (used in) financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Measure: Measure [Axis] Current-period provision for expected credit losses Financing Receivable, Credit Loss, Expense (Reversal) Valuation Approach and Technique Valuation Approach and Technique [Axis] Number of units redeemed and cancelled for exchange (in shares) Number Of Units Redeemed And Cancelled For Exchange Number of units redeemed and cancelled for exchange. Receivables from broker-dealers, clearing organizations, customers and related broker-dealers Total Receivable from Broker-Dealer and Clearing Organization Long-Lived Tangible Asset Long-Lived Tangible Asset [Domain] LPUs Limited Partnership Units [Member] Limited partnership units. Stock repurchase program and unit redemption remaining authorized amount Approximate Dollar Value of Shares That Could Be Repurchased Under the Program Share Repurchase Program, Remaining Authorized, Amount BGC Partners 4.375% Senior Notes due December 15, 2025 BGC Partners Four Point Three Seven Five Percentage Senior Notes [Member] Four point three seven five percentage senior notes. Number of businesses acquired Business Combination, Number of Businesses Acquired Certain other Trusts Controlled by Mr. Brandon G. Lutnick Certain Other Trusts Controlled By Mr. Brandon G. Lutnick [Member] Certain Other Trusts Controlled By Mr. Brandon G. Lutnick Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Entity Tax Identification Number Entity Tax Identification Number Proceeds from equity method investments Proceeds from Sale of Equity Method Investments Equity method investment, amount sold Equity Method Investment, Amount Sold Valuation Technique, Discounted Cash Flow Valuation Technique, Discounted Cash Flow [Member] Schedule of Investments in Variable Interest Entities Schedule of Variable Interest Entities [Table Text Block] Common stock, shares issued (in shares) Common Stock, Shares, Issued Weighted-average remaining lease term, operating leases (in years) Operating Lease, Weighted Average Remaining Lease Term Goodwill and Other Intangible Assets, Net Goodwill and Intangible Assets Disclosure [Text Block] Mr. Hauf Mr. Hauf [Member] Mr. Hauf Receivables from broker-dealers, clearing organizations, customers and related broker-dealers Increase (Decrease) in Receivable from Broker-Dealer and Clearing Organization Schedule of Changes in Carrying Amount of Goodwill Schedule of Goodwill [Table Text Block] Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount BGC Group Unsecured Credit Agreement BGC Group Unsecured Credit Agreement November Twenty Eight Two Thousand Eighteen [Member] BGC Group Unsecured Credit Agreement November Twenty Eight Two Thousand Eighteen Loss Contingencies [Line Items] Loss Contingencies [Line Items] Total realized and unrealized (gains) losses included in net income (loss) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Other Other [Member] Other Security Exchange Name Security Exchange Name Interim Period, Costs Not Allocable Interim Period, Costs Not Allocable [Domain] Limited Partnership Interests in Newmark Holdings Partners' Capital Notes Disclosure [Text Block] Maximum revolving credit Line of Credit Facility, Maximum Borrowing Capacity Stock repurchased during period (in shares) Stock Repurchased During Period, Shares Indefinite-lived Intangible Assets, Major Class Name Indefinite-Lived Intangible Assets, Major Class Name [Domain] Expenses: Operating Expenses [Abstract] Remaining expense related to charitable contributions Remaining Expense Related To Charitable Contributions Remaining Expense Related To Charitable Contributions Issuance of Class A and contingent Class A common stock for acquisitions Issuance Of Class Common Stock And Limited Partnership Interests For Acquisitions Issuance of Class A, contingent Class A common stock and limited partnership interests for acquisitions. Issuance of common stock and grants of exchangeability Issuance Of Common Stock And Grants Of Exchangeability Issuance of common stock and grants of exchangeability. Equity-based compensation Shares Granted, Value, Share-Based Payment Arrangement, after Forfeiture Statement [Line Items] Statement [Line Items] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] BGC Group 8.000% Senior Notes due May 25, 2028 BGC Group Eight Point Zero Percentage Senior Notes [Member] BGC Group Eight Point Zero Percentage Senior Notes Cash and cash equivalents Cash and Cash Equivalent Subsequent Event [Line Items] Subsequent Event [Line Items] Common Stock Common Stock [Member] Accrued compensation Employee-related Liabilities BGC Group BGC Group [Member] BGC Group Loans, forgivable loans and other receivables from employees and partners, net Loans Forgivable Loans And Other Receivables From Employees And Partners Loans forgivable loans and other receivables from employees and partners. Finance leases Finance Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Schedule of Share Repurchases of Class A Common Stock Unit Redemption And Share Repurchase Activity Table [Table Text Block] Unit redemption and share repurchase activity. Net increase (decrease) in Cash and cash equivalents, and Cash segregated under regulatory requirements Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Unrealized gains Unrealized Gain (Loss) on Investments Dividends declared and paid per share of common stock (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Debt instrument, renewal term Debt Instrument, Renewal Term Debt Instrument, Renewal Term Reportable Segment Reportable Segment [Member] Reportable Segment Statistical Measurement Statistical Measurement [Domain] Fixed assets, net Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment 2026 (excluding the three months ended March 31, 2026) Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Related Party Transaction Related Party Transaction [Axis] Gross Amount Intangible Assets, Gross (Excluding Goodwill) Expected tax deductible, amount Business Combination, Goodwill, Expected Tax Deductible, Amount Valuation Approach and Technique Valuation Approach and Technique [Domain] Interest rate swaps Interest Rate Swap [Member] Gains (losses) on equity method investments Income (Loss) from Equity Method Investments Leases [Abstract] Leases [Abstract] Basic earnings (loss) per share Basic earnings (loss) per share: Earnings Per Share, Basic [Abstract] Net (income) loss on level 3 assets/ liabilities outstanding Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Net Unrealized Gain Loss Included In Net Income Loss Fair value measurement with unobservable inputs reconciliation recurring basis liability net unrealized gain loss included in net income (loss). Issuance of Restricted Shares of BGC Class A common stock in acquisitions (in shares) Business Combination, Consideration Transferred, Equity Interest, Share Issued, Number of Shares Share-based payment arrangement, decrease for tax withholding obligation Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Reverse repurchase agreements Securities for Reverse Repurchase Agreements Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Basic earnings (loss) per share (in dollars per share) Earnings Per Share, Basic Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Discount rate Measurement Input, Discount Rate [Member] Total other comprehensive income (loss), net of tax Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax Schedule of Offsetting of Derivative Instruments Offsetting Derivative Instruments Table [Table Text Block] Offsetting derivative instruments. Short-term borrowings from related parties Short-Term Debt Measurement Input Type Measurement Input Type [Domain] 2029 Finance Lease, Liability, to be Paid, Year Three Schedule of Receivables from and Payables to Broker-Dealers, Clearing Organizations, Customers and Related Broker-Dealers Schedule of Due to (from) Broker-Dealer and Clearing Organization [Table Text Block] Indefinite-Lived Intangible Assets [Line Items] Indefinite-Lived Intangible Assets [Line Items] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Compensation to leased employees Related Party Transaction Compensation And Employee Benefit Expense Total expense related to fees paid to a related party to cover the compensation costs of leased employees, which is included as "compensation and employee benefits" in the consolidated statements of operations. Restricted BGC Stock Restricted BGC Stock [Member] Restricted BGC Stock Variable interest entity, primary beneficiary Variable Interest Entity, Primary Beneficiary [Member] Share-based payment arrangement, expense Share-Based Payment Arrangement, Expense Itau Unibanco S.A. Itau Unibanco S.A. [Member] Itau Unibanco S.A. Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Patents Patents [Member] Total liabilities and equity Liabilities and Equity Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Issuance of Class A common stock and RSUs for acquisitions (in shares) Acquisitions (in shares) Stock Issued During Period, Shares, Acquisitions Concentration Risk Benchmark Concentration Risk Benchmark [Axis] Stock issued to employees (in shares) Stock Issued During Period, Shares, Employee Stock Ownership Plan Senior notes Senior Notes, Noncurrent Licenses Licensing Agreements [Member] Cash and cash equivalents, and Cash segregated under regulatory requirements at beginning of period Cash and cash equivalents, and Cash segregated under regulatory requirements at end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation REUs R E Us [Member] REUs. Equity Method Investment [Table] Equity Method Investment [Table] Accounting Policies [Abstract] Accounting Policies [Abstract] Unsecured Credit Agreement Unsecured Credit Agreement November Twenty Eight Two Thousand Eighteen [Member] Unsecured credit agreement november twenty eight two thousand eighteen. Schedule of Maturity Analysis of Operating Lease Liabilities Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Concentration Risk Type Concentration Risk Type [Domain] Forwards Forward Contracts [Member] Purchase of investment carried under measurement alternative Payments to Acquire Other Investments Treasury Stock Treasury Stock, Common [Member] Delivered Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Pay vs Performance Disclosure [Line Items] Operating lease liabilities Operating Lease, Liability Equity investments carried under measurement alternative, loss Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Annual Amount Line of Credit Facility, Lender Line of Credit Facility, Lender [Domain] Liabilities Liabilities Liabilities [Abstract] Acquisitions Business Combination [Text Block] Depreciation and intangible amortization Depreciation, Depletion and Amortization, Nonproduction Amortization on ROU assets Finance Lease, Right-of-Use Asset, Amortization Schedule of the BGC Holdings and Newmark Holdings LPUs held by BGC Employees Schedule Of Limited Partnership Units Regular And Preferred Units Table [Table Text Block] Schedule of limited partnership units regular and preferred units Schedule of Quantitative Information about Level 3 Fair Value Measurements on Recurring Basis Fair Value Inputs Assets And Liabilities Quantitative Information Table [Table Text Block] Fair value inputs assets and liabilities quantitative information. Line of credit, maturity date extension (in years) Line of Credit, Maturity Date Extension Line of Credit, Maturity Date Extension Variable Interest Entity [Table] Variable Interest Entity [Table] Accounts payable, accrued and other liabilities Increase (Decrease) in Other Accounts Payable and Accrued Liabilities Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount 2029 Lessee, Operating Lease, Liability, to be Paid, Year Three Equity plan Long Term Equity Incentive Plan [Member] Long term equity incentive plan. Debt issuance costs Debt Issuance Costs, Gross Comprehensive income (loss) attributable to common stockholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Measurement Input Type Measurement Input Type [Axis] Name Measure Name Restricted Stock, Dividend Eligible Restricted Stock, Dividend Eligible [Member] Restricted Stock, Dividend Eligible Less: Reallocation of undistributed earnings to participating securities Net Income (Loss) Reallocated To Participating Securities Net Income (Loss) Reallocated To Participating Securities Schedule of Changes in Level 3 Financial Liabilities Measured at Fair Value on Recurring Basis Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Principal transactions Principal Transactions Revenue, Net Class of Stock [Line Items] Class of Stock [Line Items] Receivables from broker-dealers, clearing organizations, customers and related broker-dealers Receivable from Broker-Dealer and Clearing Organization [Abstract] Unsecured Debt Unsecured Debt [Member] Futures Future [Member] Consolidated net income (loss), adjusted for non-cash and non-operating items Net Income Loss After Adjustments For Noncash And Nonoperating Items Net income (loss) after adjustments for noncash and nonoperating items. Netting and Collateral Derivative Liability, Subject to Master Netting Arrangement, Gross Asset and Collateral, Right to Reclaim Cash, Offset Payables to related parties Increase (Decrease) in Accounts Payable, Related Parties Long-term debt Carrying Amount Long-Term Debt Legal Entity Legal Entity [Axis] Total assets Total assets Assets 2027 Finite-Lived Intangible Asset, Expected Amortization, Year One Delivered (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Minimum number of shares required to be issued (in shares) Corporate Conversion, Minimum Number Of Shares Required To Be Issued Corporate Conversion, Minimum Number Of Shares Required To Be Issued Geographical Geographical [Domain] Financing Receivable, Allowance for Credit Loss [Roll Forward] Financing Receivable, Allowance for Credit Loss [Roll Forward] Consideration transferred, including compensation expense for future services Business Combination, Consideration Transferred, Including Compensation Expense For Future Services Business Combination, Consideration Transferred, Including Compensation Expense For Future Services CASH FLOWS FROM OPERATING ACTIVITIES: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Other segment items Segment Reporting, Other Segment Item, Amount Weighted-average useful life Weighted-Average Remaining Life (Years) Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life Concentration Risk Type Concentration Risk Type [Axis] 2030 Finite-Lived Intangible Asset, Expected Amortization, Year Four Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] 2027 Finance Lease, Liability, to be Paid, Year One Dividends declared per share of common stock (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Capitalized costs Capitalized Contract Cost, Net Total identifiable assets acquired Business Combination, Recognized Asset Acquired, Asset Investments Equity Method And Alternative Investments Equity method and alternative investments. Level 2 Fair Value, Inputs, Level 2 [Member] BGC or Newmark BGC or Newmark [Member] BGC or Newmark Equity method investments Equity Method Investments Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Business Combination Business Combination [Domain] Financial Instruments Owned, at Fair Value Securities Owned Disclosure [Text Block] Securities owned disclosure. Operating leases Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Related Party Related Party [Member] Redeemed/exchanged units (in shares) Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instrument Redeemed Exchanged Number of exchangeable limited partnership units redeemed or exchanged into the Company's class A common stock during the period. Receivables from clearing organizations Receivables from Clearing Organizations Schedule of Lease Expense [Table] Schedule Of Lease Expense [Table] Schedule Of Operating Lease Expense. Plan Name Plan Name [Axis] Document Information [Table] Document Information [Table] PEO PEO [Member] FX Brokerage Foreign Exchange [Member] Brokerage foreign exchange. Communications Communication UNITED STATES UNITED STATES Revenues From Contracts With Customers [Line Items] Revenue From Contracts With Customers [Line Items] Revenue from contracts with customers. Retained Deficit Retained Earnings [Member] Rates Brokerage Rates [Member] Brokerage rates. Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Income Statement [Abstract] Income Statement [Abstract] Net amounts presented in the statements of financial condition, assets Derivative Asset Revenue, Major Customer [Line Items] Revenue, Major Customer [Line Items] Interest expense Interest Expense [Member] BGC Group 6.600% Senior Notes due June 10, 2029 BGC Group Six Point Six Percentage Senior Notes [Member] BGC Group Six Point Six Percentage Senior Notes Tax withholding (in dollars per share) Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Per Share Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Per Share Other intangible assets, net Net Carrying Amount Intangible Assets, Net (Excluding Goodwill) Product and Service Product and Service [Domain] Consolidated net income (loss) Consolidated net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Total Liabilities, Fair Value Disclosure Business Combination [Table] Business Combination [Table] Notional Amounts Derivative, Notional Amount Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Purchase of other assets Payments to Acquire Other Productive Assets Total compensation and employee benefits Total compensation and employee benefits Compensation And Employee Benefit Net The aggregate amount of expenditures for salaries, wages, profit sharing and incentives compensation, and other employee benefits, including share-based compensation and the expense related to allocation of income to limited partnership units and founding/working partner units. Investments Business Combination, Recognized Asset Acquired, Investments Business Combination, Recognized Asset Acquired, Investments Schedule of Recognized Identified Assets Acquired and Liabilities Assumed Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block] Schedule of Fully Diluted Earnings Per Share Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table Text Block] City Area Code City Area Code Forfeited Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures In Period Fair Value Share based compensation arrangement by share based payment award equity instruments other than options forfeitures in period fair value. Schedule of Current Expected Credit Losses Financing Receivable, Allowance for Credit Loss [Table Text Block] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] CASH FLOWS FROM INVESTING ACTIVITIES: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Total long-lived assets Long-Lived Assets Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] BGC Holdings B G C Holdings [Member] BGC holdings. Accounts payable, accrued and other liabilities [extensible list] Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] Other (in shares) Incremental Common Shares Attributable To Other Instruments Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of other instruments. Related Party Transactions [Abstract] Related Party Transactions [Abstract] Corporate Conversion Corporate Conversion [Policy Text Block] Corporate Conversion Goodwill Beginning balance Ending balance Goodwill Schedule of Components of Lease Expense Lease, Cost [Table Text Block] Financial instruments owned, at fair value Increase (Decrease) in Financial Instruments Used in Operating Activities Net assets held by regulated subsidiaries Net Regulatory Assets Supplemental cash information: Supplemental Cash Flow Information [Abstract] Other Performance Measure, Amount Other Performance Measure, Amount Underwriting fees paid Payments of Debt Issuance Costs Accounts receivable acquired, fair value Business Combination, Acquired Receivable, Purchased without Credit Deterioration, Fair Value Tower Bridge International Services LP Tower Bridge International Services L P [Member] Tower Bridge International Services LP. Related and Nonrelated Parties Related and Nonrelated Parties [Domain] Derivative Instrument Derivative Instrument [Axis] Net amounts of recognized liabilities Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Accrued commissions and other receivables, net Accrued Fees and Other Revenue Receivable Leases Lessee, Finance Leases [Text Block] Additional paid-in capital Additional Paid in Capital, Common Stock Entity Entity [Domain] Net cash provided by (used in) investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Cash paid during the period for interest Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Document Fiscal Year Focus Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Lender Name Lender Name [Axis] Operating lease ROU assets Operating Lease, Right-of-Use Asset Cash and collateral posted expense Cash And Collateral Posted Expense Cash And Collateral Posted Expense Operating lease cost Operating Lease, Cost Capitalization of software development costs Payments for Software Plan Name Plan Name [Domain] Acquisition-related cost, expense Business Combination, Acquisition-Related Cost, Expense Fees to related parties Fee Expense Fee Expense Unrecognized compensation expense related to unvested recognized period (in years) Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Equity [Abstract] Equity [Abstract] Segment and Geographic Information Segment Reporting Disclosure [Text Block] Dr. Bell Dr. Bell [Member] Dr. Bell 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] Forfeitures of Class A common stock Payment For Forfeiture Of Restricted Stock Award Payment For Forfeiture Of Restricted Stock Award Trademarks Trademarks [Member] Fully diluted weighted-average shares of common stock outstanding (in shares) Weighted Average Number Of Diluted Shares Outstanding From Continuing Operations Weighted average number of diluted shares outstanding from continuing operations. 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Collateralized Transactions Repurchase Agreements, Resale Agreements, Securities Borrowed, and Securities Loaned Disclosure [Text Block] Fixed asset depreciation and intangible asset amortization Depreciation expense Depreciation, Depletion and Amortization Schedule of Revenues from External Customers and Long-Lived Assets [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Receivables from related parties Increase (Decrease) Due from Affiliates Accrued commissions and other receivables, net Business Combination, Recognized Assets Acquired, Accrued Commissions And Other Receivables, Net Business Combination, Recognized Assets Acquired, Accrued Commissions And Other Receivables, Net Revolving credit facility Revolving Credit Facility [Member] Finance lease liabilities Total Finance Lease, Liability Arrangement Duration Trading Arrangement Duration Derivative, gain (loss), statement of income or comprehensive income [Extensible Enumeration] Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Computer and communications equipment Computer Equipment [Member] Segments Segments [Axis] Schedule of Equity Method Investments And Investments Carried Under the Measurement Alternative Equity Method Investments And Investments Carried Under Measurement Alternative Table [Table Text Block] Equity method investments and investments carried under measurement alternative. 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