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Stock Transactions and Unit Redemptions - Share Repurchases of Class A Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
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May 19, 2025 | May 16, 2025 | Feb. 05, 2025 | Sep. 30, 2025 | Aug. 31, 2025 | Jul. 31, 2025 | Sep. 30, 2024 | Aug. 31, 2024 | Jul. 31, 2024 | Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Number of Shares Repurchased (in shares) |  |  |  | 2,225,000 | 2,014,000 | 0 | 1,046,000 | 4,807,000 | 2,040,000 | 4,239,000 | 17,224,000 | 3,184,000 | 7,893,000 | 10,688,000 | 11,250,000 | 24,647,000 | 29,831,000
Weighted-Average Price Paid per Share (in dollars per share) |  |  |  | $ 9.96 | $ 9.80 | $ 0 | $ 9.65 | $ 9.12 | $ 8.59 |  | $ 9.21 | $ 9.36 |  | $ 8.32 | $ 7.11 | $ 9.34 | $ 8.06
Approximate Dollar Value of Shares That Could Be Repurchased Under the Program |  |  |  | $ 136,518 |  |  | $ 121,173 |  |  | $ 136,518 |  |  | $ 121,173 |  |  | $ 136,518 | $ 121,173
Aggregate purchase price of Class A common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 213,549 | $ 212,192
Shares withheld to satisfy tax liabilities (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 900,000 |  |  | 1,800,000 | 3,600,000
Weighted-average price of shares withheld for tax liabilities (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 8.48 |  |  | $ 9.16 | $ 7.98
Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Number of Shares Repurchased (in shares) |  |  |  |  |  |  |  |  |  | 4,236,069 |  |  | 7,013,116 |  |  | 22,808,205 | 26,264,523
Approximate Dollar Value of Shares That Could Be Repurchased Under the Program |  |  |  | $ 136,500 |  |  |  |  |  | $ 136,500 |  |  |  |  |  | $ 136,500 |
Stock repurchased during period (in shares) |  |  |  |  |  |  |  |  |  | 4,200,000 |  |  | 7,900,000 |  |  | 24,600,000 | 29,800,000
Aggregate purchase price of Class A common stock |  |  |  |  |  |  |  |  |  | $ 41,900 |  |  | $ 71,500 |  |  | $ 230,300 | $ 240,400
Stock repurchased, weighted average price (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 9.88 |  |  | $ 9.05 |  |  | $ 9.34 | $ 8.06
Shares withheld to satisfy tax liabilities (in shares) |  |  | 700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, decrease for tax withholding obligation |  |  |  |  |  |  |  |  |  | $ 10,100 |  |  | $ 3,700 |  |  | $ 31,000 | $ 24,900
Class A Common Stock | Mr. Howard W. Lutnick | Nonrelated Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Number of Shares Repurchased (in shares) |  | 16,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A Common Stock | Mr. Howard W. Lutnick | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Number of Shares Repurchased (in shares) | 16,115,102 | 16,452,850 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased, weighted average price (in dollars per share) |  | $ 9.2082 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, decrease for tax withholding obligation |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,500 |  |  | $ 16,800 | $ 28,400

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