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Stock Transactions and Unit Purchases - Schedule of Share Repurchase Activity (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended		3 Months Ended			9 Months Ended
	May 16, 2025	Sep. 30, 2025	Aug. 31, 2025	Sep. 30, 2025	Jun. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	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
Share Repurchases, 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	0	10,839,674	6,779,828	10,839,674	15,745,930
Share Repurchases, Average Price Paid per Share (in dollars per share)		$ 0	$ 0		$ 11.58	$ 13.21	$ 11.58	$ 11.56
Approximate Dollar Value of Units and Shares That May Yet Be Repurchased/ Purchased Under the  Program		$ 246,397		$ 246,397			$ 246,397
Class A Common Stock | Howard W. Lutnick, Spouse and Trusts | Mr. Lutnick
Class of Stock
Share Repurchases, Total Number of Shares Repurchased (in shares)	10,800,000

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