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v3.23.3

Subsequent Events (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 27, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Oct. 06, 2023 | Oct. 04, 2023 | May 25, 2023 | Dec. 31, 2022 | Jul. 10, 2020 | Sep. 27, 2019
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends declared per share of common stock (in dollars per share) |  | $ 0.01 | $ 0.01 | $ 0.03 | $ 0.03 |  |  |  |  |  |
Carrying Amount |  | $ 944,565 |  | $ 944,565 |  |  |  |  | $ 1,045,966 |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends declared per share of common stock (in dollars per share) | $ 0.01 |  |  |  |  |  |  |  |  |  |
BGC Partners 3.750% Senior Notes due October 1, 2024 |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 3.75% |  | 3.75% |  |  |  |  |  |  | 3.75%
Carrying Amount |  | $ 299,180 |  | $ 299,180 |  |  |  |  | 298,558 |  |
BGC Partners 3.750% Senior Notes due October 1, 2024 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  |  | 3.75%
BGC Partners 3.750% Senior Notes due October 1, 2024 | Subsequent event |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying Amount |  |  |  |  |  |  | $ 44,500 |  |  |  |
BGC Partners 3.750% Senior Notes due October 1, 2024 | Subsequent event | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying Amount |  |  |  |  |  | $ 255,500 |  |  |  |  |
BGC Partners 8.000% Senior Notes due May 25, 2028 |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 8.00% |  | 8.00% |  |  |  | 8.00% |  |  |
Carrying Amount |  | $ 346,755 |  | $ 346,755 |  |  |  |  | 0 |  |
BGC Partners 8.000% Senior Notes due May 25, 2028 | Subsequent event |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying Amount |  |  |  |  |  |  | 2,800 |  |  |  |
BGC Partners 8.000% Senior Notes due May 25, 2028 | Subsequent event | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying Amount |  |  |  |  |  | 347,200 |  |  |  |  |
BGC Partners 4.375% Senior Notes due December 15, 2025 |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 4.375% |  | 4.375% |  |  |  |  |  | 4.375% | 4.375%
Carrying Amount |  | $ 298,630 |  | $ 298,630 |  |  |  |  | $ 298,165 |  |
BGC Partners 4.375% Senior Notes due December 15, 2025 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  | 4.375% |
BGC Partners 4.375% Senior Notes due December 15, 2025 | Subsequent event |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying Amount |  |  |  |  |  |  | $ 11,800 |  |  |  |
BGC Partners 4.375% Senior Notes due December 15, 2025 | Subsequent event | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying Amount |  |  |  |  |  | $ 288,200 |  |  |  |  |

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