Stock Transactions and Unit Purchases - Schedule of Share Repurchase Activity (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended			3 Months Ended	12 Months Ended
	May 16, 2025	Dec. 31, 2025	Nov. 30, 2025	Oct. 31, 2025	Jun. 30, 2025	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Nov. 04, 2024
Class of Stock
Approximate Dollar Value of Units and Shares That May Yet Be Repurchased/ Purchased Under the  Program									$ 400,000
Mr. Lutnick
Class of Stock
Average Price Paid per Share (in dollars per share)	$ 11.58
Class A Common Stock
Class of Stock
Share Repurchases, Total Number of Shares Repurchased (in shares)		0	0	134,259	10,839,674	10,973,933	17,729,096	5,785,370
Average Price Paid per Share (in dollars per share)		$ 0	$ 0	$ 11.50	$ 11.58	$ 11.58	$ 11.99
Approximate Dollar Value of Units and Shares That May Yet Be Repurchased/ Purchased Under the  Program		$ 244,852				$ 244,852
Class A Common Stock | Howard W. Lutnick, Spouse and Trusts | Mr. Lutnick
Class of Stock
Share Repurchases, Total Number of Shares Repurchased (in shares)	11,000,000.0