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v3.25.1

Subsequent Events (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |
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May 09, 2025 | Apr. 04, 2025 | Apr. 03, 2025 | Apr. 02, 2025 | Apr. 01, 2025 | Apr. 01, 2024 | Mar. 12, 2024 | Mar. 08, 2024 | Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024 | May 06, 2025 | Jun. 07, 2024 | Aug. 06, 2018 | Mar. 19, 2018
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount of debt component |  |  |  |  |  |  |  |  | $ 1,688,640 |  | $ 1,337,540 |  |  |  |
Total consideration transferred |  |  |  |  |  |  |  |  |  |  | $ 87,300 |  |  |  |
Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Underwriting fees |  |  |  |  |  |  |  |  | 0 | $ 0 |  |  |  |  |
Revolving credit facility | Related Party | BGC Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of outstanding borrowings |  |  |  |  |  | $ 275,000 |  |  |  |  |  |  |  |  |
Principal amount of debt component |  |  |  |  |  |  |  | $ 400,000 |  |  |  |  | $ 400,000 | $ 400,000 | $ 250,000
Proceeds from borrowings |  |  |  |  |  |  | $ 275,000 |  | $ 0 |  |  |  |  |  |
Average interest rate (as a percent) |  |  |  |  |  |  | 6.92% | 1.00% |  |  |  |  |  |  |
Subsequent Event | OTC Global |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |
Total consideration transferred |  |  |  |  | $ 325,000 |  |  |  |  |  |  |  |  |  |
Payments to acquire businesses |  |  |  |  | 322,500 |  |  |  |  |  |  |  |  |  |
Consideration without cash |  |  |  |  | $ 2,500 |  |  |  |  |  |  |  |  |  |
Subsequent Event | BCG Group 6.150% Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 6.15% |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt component |  |  |  | $ 700,000 |  |  |  |  |  |  |  |  |  |  |
Carrying amount of debt component |  |  |  | 692,800 |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  | 7,200 |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | BCG Group 6.150% Senior Notes | Underwriting fees | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Underwriting fees |  |  |  | $ 400 |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Revolving credit facility | Related Party | BGC Credit Agreement | Cantor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of outstanding borrowings |  | $ 15,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from borrowings | $ 105,000 | $ 120,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Average interest rate (as a percent) | 6.18% | 6.17% |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Revolving credit facility | Unsecured credit agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of outstanding borrowings |  |  | $ 550,000 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend declared per share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 0.02 |  |  |

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