0000001 - Document - Cover link:presentationLink link:calculationLink link:definitionLink 9952151 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION link:presentationLink link:calculationLink link:definitionLink 9952152 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952153 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS link:presentationLink link:calculationLink link:definitionLink 9952154 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) link:presentationLink link:calculationLink link:definitionLink 9952155 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS link:presentationLink link:calculationLink link:definitionLink 9952156 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY link:presentationLink link:calculationLink link:definitionLink 9952157 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952158 - Disclosure - Organization and Basis of Presentation link:presentationLink link:calculationLink link:definitionLink 9952159 - Disclosure - Limited Partnership Interests in Newmark Holdings link:presentationLink link:calculationLink link:definitionLink 9952160 - Disclosure - Summary of Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 9952161 - Disclosure - Acquisitions link:presentationLink link:calculationLink link:definitionLink 9952162 - Disclosure - Divestitures link:presentationLink link:calculationLink link:definitionLink 9952163 - Disclosure - Earnings Per Share link:presentationLink link:calculationLink link:definitionLink 9952164 - Disclosure - Stock Transactions link:presentationLink link:calculationLink link:definitionLink 9952165 - Disclosure - Financial Instruments Owned, at Fair Value link:presentationLink link:calculationLink link:definitionLink 9952166 - Disclosure - Collateralized Transactions link:presentationLink link:calculationLink link:definitionLink 9952167 - Disclosure - Receivables from and Payables to Broker-Dealers, Clearing Organizations, Customers and Related Broker-Dealers link:presentationLink link:calculationLink link:definitionLink 9952168 - Disclosure - Derivatives link:presentationLink link:calculationLink link:definitionLink 9952169 - Disclosure - Fair Value of Financial Assets and Liabilities link:presentationLink link:calculationLink link:definitionLink 9952170 - Disclosure - Related Party Transactions link:presentationLink link:calculationLink link:definitionLink 9952171 - Disclosure - Investments link:presentationLink link:calculationLink link:definitionLink 9952172 - Disclosure - Fixed Assets, Net link:presentationLink link:calculationLink link:definitionLink 9952173 - Disclosure - Goodwill and Other Intangible Assets, Net link:presentationLink link:calculationLink link:definitionLink 9952174 - Disclosure - Notes Payable and Other Borrowings link:presentationLink link:calculationLink link:definitionLink 9952175 - Disclosure - Compensation link:presentationLink link:calculationLink link:definitionLink 9952176 - Disclosure - Commitments, Contingencies and Guarantees link:presentationLink link:calculationLink link:definitionLink 9952177 - Disclosure - Income Taxes link:presentationLink link:calculationLink link:definitionLink 9952178 - Disclosure - Regulatory Requirements link:presentationLink link:calculationLink link:definitionLink 9952179 - Disclosure - Segment and Geographic Information link:presentationLink link:calculationLink link:definitionLink 9952180 - Disclosure - Revenues from Contracts with Customers link:presentationLink link:calculationLink link:definitionLink 9952181 - Disclosure - Leases link:presentationLink link:calculationLink link:definitionLink 9952182 - Disclosure - Current Expected Credit Losses (CECL) link:presentationLink link:calculationLink link:definitionLink 9952183 - Disclosure - Subsequent Events link:presentationLink link:calculationLink link:definitionLink 9955511 - Disclosure - Organization and Basis of Presentation (Policies) link:presentationLink link:calculationLink link:definitionLink 9955512 - Disclosure - Acquisitions (Tables) link:presentationLink link:calculationLink link:definitionLink 9955513 - Disclosure - Earnings Per Share (Tables) link:presentationLink link:calculationLink link:definitionLink 9955514 - Disclosure - Stock Transactions (Tables) link:presentationLink link:calculationLink link:definitionLink 9955515 - Disclosure - Receivables from and Payables to Broker-Dealers, Clearing Organizations, Customers and Related Broker-Dealers (Tables) link:presentationLink link:calculationLink link:definitionLink 9955516 - Disclosure - Derivatives (Tables) link:presentationLink link:calculationLink link:definitionLink 9955517 - Disclosure - Fair Value of Financial Assets and Liabilities (Tables) link:presentationLink link:calculationLink link:definitionLink 9955518 - Disclosure - Investments (Tables) link:presentationLink link:calculationLink link:definitionLink 9955519 - Disclosure - Fixed Assets, Net (Tables) link:presentationLink link:calculationLink link:definitionLink 9955520 - Disclosure - Goodwill and Other Intangible Assets, Net (Tables) link:presentationLink link:calculationLink link:definitionLink 9955521 - Disclosure - Notes Payable and Other Borrowings (Tables) link:presentationLink link:calculationLink link:definitionLink 9955522 - Disclosure - Compensation (Tables) link:presentationLink link:calculationLink link:definitionLink 9955523 - Disclosure - Segment and Geographic Information (Tables) link:presentationLink link:calculationLink link:definitionLink 9955524 - Disclosure - Revenues from Contracts with Customers (Tables) link:presentationLink link:calculationLink link:definitionLink 9955525 - Disclosure - Leases (Tables) link:presentationLink link:calculationLink link:definitionLink 9955526 - Disclosure - Current Expected Credit Losses (CECL) (Tables) link:presentationLink link:calculationLink link:definitionLink 9955527 - Disclosure - Organization and Basis of Presentation (Details) link:presentationLink link:calculationLink link:definitionLink 9955528 - Disclosure - Limited Partnership Interests in Newmark Holdings (Details) link:presentationLink link:calculationLink link:definitionLink 9955529 - Disclosure - Acquisitions - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955530 - Disclosure - Acquisitions - Calculation of the Purchase Price Consideration Transferred (Details) link:presentationLink link:calculationLink link:definitionLink 9955531 - Disclosure - Acquisitions - Preliminary Allocation of the Assets Acquired, and Liabilities Assumed (Details) link:presentationLink link:calculationLink link:definitionLink 9955532 - Disclosure - Divestitures (Details) link:presentationLink link:calculationLink link:definitionLink 9955533 - Disclosure - Earnings Per Share - Calculation of Basic Earnings Per Share (Details) link:presentationLink link:calculationLink link:definitionLink 9955534 - Disclosure - Earnings Per Share - Calculation of Fully Diluted Earnings Per Share (Details) link:presentationLink link:calculationLink link:definitionLink 9955535 - Disclosure - Earnings Per Share - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955536 - Disclosure - Stock Transactions - Changes in Shares of Class A Common Stock Outstanding (Details) link:presentationLink link:calculationLink link:definitionLink 9955537 - Disclosure - Stock Transactions - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955538 - Disclosure - Stock Transactions - Share Repurchases of Class A Common Stock (Details) link:presentationLink link:calculationLink link:definitionLink 9955539 - Disclosure - Financial Instruments Owned, at Fair Value (Details) link:presentationLink link:calculationLink link:definitionLink 9955540 - Disclosure - Collateralized Transactions (Details) link:presentationLink link:calculationLink link:definitionLink 9955541 - Disclosure - Receivables from and Payables to Broker-Dealers, Clearing Organizations, Customers and Related Broker-Dealers (Details) link:presentationLink link:calculationLink link:definitionLink 9955542 - Disclosure - Derivatives - Fair Value of Derivative Contracts (Details) link:presentationLink link:calculationLink link:definitionLink 9955543 - Disclosure - Derivatives - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955544 - Disclosure - Derivatives - Offsetting of Derivative Instruments (Details) link:presentationLink link:calculationLink link:definitionLink 9955545 - Disclosure - Derivatives - Gains and (Losses) on Derivative Contracts (Details) link:presentationLink link:calculationLink link:definitionLink 9955546 - Disclosure - Fair Value of Financial Assets and Liabilities - Fair Value Hierarchy of Financial Assets and Liabilities under U.S. GAAP Guidance (Details) link:presentationLink link:calculationLink link:definitionLink 9955546 - Disclosure - Fair Value of Financial Assets and Liabilities - Fair Value Hierarchy of Financial Assets and Liabilities under U.S. GAAP Guidance (Details) link:presentationLink link:calculationLink link:definitionLink 9955547 - Disclosure - Fair Value of Financial Assets and Liabilities - Changes in Level 3 Liabilities Measured at Fair Value on Recurring Basis (Details) link:presentationLink link:calculationLink link:definitionLink 9955548 - Disclosure - Fair Value of Financial Assets and Liabilities - Quantitative Information about Level 3 Fair Value Measurements on Recurring Basis (Details) link:presentationLink link:calculationLink link:definitionLink 9955549 - Disclosure - Fair Value of Financial Assets and Liabilities - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955550 - Disclosure - Related Party Transactions - Service Agreements (Details) link:presentationLink link:calculationLink link:definitionLink 9955551 - Disclosure - Related Party Transactions - Clearing Capital Agreement with Cantor (Details) link:presentationLink link:calculationLink link:definitionLink 9955552 - Disclosure - Related Party Transactions - Purchases of Futures Exchange Group (Details) link:presentationLink link:calculationLink link:definitionLink 9955553 - Disclosure - Related Party Transactions - BGC Credit Agreement (Details) link:presentationLink link:calculationLink link:definitionLink 9955554 - Disclosure - Related Party Transactions - Other Agreements with Cantor (Details) link:presentationLink link:calculationLink link:definitionLink 9955555 - Disclosure - Related Party Transactions - Receivables from and Payables to Related Broker-Dealers (Details) link:presentationLink link:calculationLink link:definitionLink 9955556 - Disclosure - Related Party Transactions - Loans, Forgivable Loans and Other Receivables from Employees and Partners, Net (Details) link:presentationLink link:calculationLink link:definitionLink 9955557 - Disclosure - Related Party Transactions - Other Transactions with CF&Co (Details) link:presentationLink link:calculationLink link:definitionLink 9955558 - Disclosure - Related Party Transactions - Transactions with Executive Officers and Directors (Details) link:presentationLink link:calculationLink link:definitionLink 9955559 - Disclosure - Related Party Transactions - Transactions with Other Related Parties (Details) link:presentationLink link:calculationLink link:definitionLink 9955560 - Disclosure - Related Party Transactions - Transactions with the Relief Fund (Details) link:presentationLink link:calculationLink link:definitionLink 9955561 - Disclosure - Related Party Transactions - Other Transactions (Details) link:presentationLink link:calculationLink link:definitionLink 9955562 - Disclosure - Investments - Equity Method Investments and Investments Carried Under Measurement Alternative (Details) link:presentationLink link:calculationLink link:definitionLink 9955563 - Disclosure - Investments - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955564 - Disclosure - Investments - Investments in Variable Interest Entities (Details) link:presentationLink link:calculationLink link:definitionLink 9955565 - Disclosure - Fixed Assets, Net - Components of Fixed Assets, Net (Details) link:presentationLink link:calculationLink link:definitionLink 9955566 - Disclosure - Fixed Assets, Net - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955567 - Disclosure - Goodwill and Other Intangible Assets, Net - Changes in Carrying Amount of Goodwill (Details) link:presentationLink link:calculationLink link:definitionLink 9955568 - Disclosure - Goodwill and Other Intangible Assets, Net - Components of Other Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9955569 - Disclosure - Goodwill and Other Intangible Assets, Net - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955570 - Disclosure - Goodwill and Other Intangible Assets, Net - Estimated Future Amortization Expense of Definite Life Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9955571 - Disclosure - Notes Payable and Other Borrowings - Notes Payable, Other and Short-term Borrowings (Details) link:presentationLink link:calculationLink link:definitionLink 9955572 - Disclosure - Notes Payable and Other Borrowings - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955573 - Disclosure - Notes Payable and Other Borrowings - Carrying Amounts and Estimated Fair Values of Company's Senior Notes (Details) link:presentationLink link:calculationLink link:definitionLink 9955574 - Disclosure - Compensation - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955575 - Disclosure - Compensation - Compensation Expense Related to Class A Common Stock (Details) link:presentationLink link:calculationLink link:definitionLink 9955576 - Disclosure - Compensation - Activity Associated with LPU's Held by BGC Employees (Details) link:presentationLink link:calculationLink link:definitionLink 9955577 - Disclosure - Compensation - Summary of the BGC Holdings and Newmark Holdings LPUs Held by BGC Employees (Details) link:presentationLink link:calculationLink link:definitionLink 9955578 - Disclosure - Compensation - Compensation Expense Related to Issuance of BGC or Newmark Class A Common Stock and Grants of Exchangeability on BGC Holdings and Newmark Holdings LPUs Held by BGC Employees (Details) link:presentationLink link:calculationLink link:definitionLink 9955579 - Disclosure - Compensation - Activity Associated with Limited Partnership Units Awarded to BGC Employees (Details) link:presentationLink link:calculationLink link:definitionLink 9955580 - Disclosure - Compensation - Compensation Expense Related to Restricted Stock Unit Held by BGC Employees (Details) link:presentationLink link:calculationLink link:definitionLink 9955581 - Disclosure - Compensation - Activity Associated with Restricted Stock Units and Restricted Stock (Details) link:presentationLink link:calculationLink link:definitionLink 9955582 - Disclosure - Commitments, Contingencies and Guarantees (Details) link:presentationLink link:calculationLink link:definitionLink 9955583 - Disclosure - Regulatory Requirements (Details) link:presentationLink link:calculationLink link:definitionLink 9955584 - Disclosure - Segment and Geographic Information - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955585 - Disclosure - Segment and Geographic Information - Product Information Regarding Revenues (Details) link:presentationLink link:calculationLink link:definitionLink 9955586 - Disclosure - Segment and Geographic Information - Geographic Information Regarding Revenues (Details) link:presentationLink link:calculationLink link:definitionLink 9955587 - Disclosure - Segment and Geographic Information - Information Regarding Long-Lived Assets in Geographic Areas (Details) link:presentationLink link:calculationLink link:definitionLink 9955588 - Disclosure - Revenues from Contracts with Customers - Revenues from Contracts with Customers and Other Sources of Revenues (Details) link:presentationLink link:calculationLink link:definitionLink 9955589 - Disclosure - Revenues from Contracts with Customers - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955590 - Disclosure - Leases - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955591 - Disclosure - Leases - Supplemental Information Related to Operating and Finance Leases (Details) link:presentationLink link:calculationLink link:definitionLink 9955592 - Disclosure - Leases - Weighted-Average Remaining Lease Term and Discount Rate (Details) link:presentationLink link:calculationLink link:definitionLink 9955593 - Disclosure - Leases - Components of Lease Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9955594 - Disclosure - Leases - Maturity Analysis of Lease Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955594 - Disclosure - Leases - Maturity Analysis of Lease Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955595 - Disclosure - Leases - Cash Flow Information Related to Lease Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955596 - Disclosure - Current Expected Credit Losses (CECL) - Current Expected Credit Losses (Details) link:presentationLink link:calculationLink link:definitionLink 9955597 - Disclosure - Current Expected Credit Losses (CECL) - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955598 - Disclosure - Subsequent Events (Details) link:presentationLink link:calculationLink link:definitionLink