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Related Party Transactions - Other Transactions (Details) - USD ($)			12 Months Ended
	Nov. 04, 2016	Oct. 25, 2016	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Mar. 31, 2022	Feb. 15, 2022	Feb. 25, 2021	Nov. 03, 2016
Related Party Transaction [Line Items]
Due to related parties				$ 8,300,000		$ 8,300,000
Equity investment			$ 588,000	1,115,000	$ 1,458,000
Receivables from related parties			1,444,000	5,237,000
Cantor
Related Party Transaction [Line Items]
Recognized related party revenues			14,700,000	14,900,000	25,800,000
Newmark
Related Party Transaction [Line Items]
Due to related parties			0
Aqua
Related Party Transaction [Line Items]
Interest income, related party			$ 0
Cantor \| Aqua
Related Party Transaction [Line Items]
Investment ownership percentage			51.00%
Aqua
Related Party Transaction [Line Items]
Increase in authorization amount for loans and investments, other credit support arrangements							$ 1,000,000	$ 1,000,000
Authorization amount for loans and investments, other credit support arrangements								$ 21,200,000
Equity investment			$ 600,000	1,100,000
Receivables from related parties			$ 980,000	980,000
Loan receivable, basis spread on variable rate			6.00%
Subordinated loan, portion written off			$ 550,000
Aqua \| BGC Partners, Inc. \| Aqua
Related Party Transaction [Line Items]
Percentage of ownership interest			49.00%
Lucera
Related Party Transaction [Line Items]
Payments to acquire businesses	$ 24,200,000
Business combination, consideration, post-closing adjustment	$ 4,800,000
Lucera \| Cantor
Related Party Transaction [Line Items]
Recognized related party revenues			$ 23,200	$ 200,000	$ 700,000
Lucera \| Class B Units
Related Party Transaction [Line Items]
Percentage of ownership interest									20.00%
Purchase of units (in shares)		9,000
Percentage of outstanding common stock owned by parent	100.00%