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Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 11 Months Ended | 12 Months Ended
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Dec. 31, 2020 USD ($) | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 USD ($) | Nov. 30, 2018 Segment | Dec. 31, 2020 USD ($) Segment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of reportable segments | Segment |  |  |  |  |  | 2 | 1 |  |  |
Maturity days for highly liquid investments |  |  |  |  |  |  | The Company considers all highly liquid investments with maturities of 90 days or less at the date of acquisition that are not segregated under regulatory requirements, other than those used for trading purposes, to be cash equivalents. |  |  |
Allowance for doubtful accounts on accrued commissions receivable | $ 14,000,000.0 |  |  |  | $ 10,500,000 |  | $ 14,000,000.0 | $ 10,500,000 |  |
Ownership interest |  |  |  |  |  |  | The Company’s policy is to consolidate all entities of which it owns more than 50% unless it does not have control over the entity. |  |  |
Impairment of goodwill | $ 0 |  |  |  | $ 0 |  | $ 0 | 0 | $ 0 |
Impairment of goodwill or indefinite-lived intangible assets |  |  |  |  |  |  | $ 0 | $ 0 | $ 0 |
US federal corporate tax rate |  |  |  |  |  |  | 21.00% | 21.00% |  | 35.00%
Restricted stock saleable period Description |  |  |  |  |  |  | shares of restricted stock are generally saleable by partners in five to ten years. |  |  |
Payout period for post-termination awards |  |  |  |  |  |  | four equal yearly installments |  |  |
Limited partnership units exchangeability into Class A common stock |  |  |  |  |  |  | Following the Spin-Off, certain limited partnership units in BGC Holdings are granted exchangeability or redeemed in connection with the grant of shares of BGC Class A common stock on a one-for-one basis (subject to adjustment), and certain limited partnership units in Newmark Holdings are granted exchangeability or redeemed in connection with the grant of shares of Newmark Class A common stock based on the exchange ratio at the time. |  |  |
Percentage to preferred units | 0.6875% | 0.6875% | 0.6875% | 0.6875% |  |  | 2.75% |  |  |
U.S. Federal [Member] |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Open tax year |  |  |  |  |  |  | 2008 |  |  |
U.S. State and Local [Member] |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Open tax year |  |  |  |  |  |  | 2009 |  |  |
Non-U.S [Member] |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Open tax year |  |  |  |  |  |  | 2012 |  |  |
Software, Including Software Development Costs [Member] |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Software amortization period |  |  |  |  |  |  | 3 years |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Restricted stock saleable period |  |  |  |  |  |  | 10 years |  |  |
Maximum [Member] | Computer and Communications Equipment [Member] |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Useful life of computer software |  |  |  |  |  |  | 5 years |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Restricted stock saleable period |  |  |  |  |  |  | 5 years |  |  |
Minimum [Member] | Computer and Communications Equipment [Member] |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Useful life of computer software |  |  |  |  |  |  | 3 years |  |  |

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