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Limited Partnership Interests in BGC Holdings and Newmark Holdings (Details)		12 Months Ended
	Jul. 01, 2023 shares	Dec. 31, 2024 installment partnership	Jun. 05, 2015
Noncontrolling Interest [Abstract]
Number of operating partnerships | partnership		2
Limited partnership interest, conversion ratio		1	1
Number of installment | installment		4
Percentage to preferred units		2.75%
Conversion of stock, shares converted (in shares)	64,000,000
Minimum number of shares required to be issued (in shares)	75,000,000
Newmark | Class A Common Stock
Noncontrolling Interest [Abstract]
Limited partnership interests exchange ratio		92.79%
Newmark Holdings
Noncontrolling Interest [Abstract]
Calculation of contribution ratio, denominator		2.2
Limited partnership interest, conversion ratio		1
Percentage to preferred units		0.6875%
Percentage of preferred partnership units awarded per calendar year		2.75%
BGC Holdings LPUs
Noncontrolling Interest [Abstract]
Limited partnership interest, conversion ratio		1
Percentage to preferred units		0.6875%
Percentage of preferred partnership units awarded per calendar year		2.75%

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Limited partnership interests exchange ratio, subject to adjustment.

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The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482913/230-10-50-4

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482913/230-10-50-3

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482913/230-10-50-5

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