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Compensation - Schedule of Activity Associated with Limited Partnership Units (Details) - shares	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Newmark Holdings Units
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding
Beginning balance (in shares)	51,796,454	42,376,966
Issued (in shares)	10,735,416	16,440,711
Redeemed/exchanged units (in shares)	(11,541,874)	(6,166,506)
Number of units, Forfeited units/other (in shares)	(1,149,640)	(854,717)
Ending balance (in shares)	49,840,356	51,796,454
Exchangeable units (in shares)	12,378,576	13,906,798
Newmark Holdings Units | Limited Partnership Units
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding
Beginning balance (in shares)	2,700,000
Ending balance (in shares)	2,200,000	2,700,000
Exchangeable partnership units (in shares)	1,400,000	1,800,000
Newmark Holdings Units | Limited Partnership Units | Employee
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding
Ending balance (in shares)	2,200,000
BGC Holdings Units | Limited Partnership Units
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding
Ending balance (in shares)	0

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- Definition

Exchangeable Partnership Units

+ References

No definition available.

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- Definition

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- Definition

Number of exchangeable limited partnership units redeemed or exchanged into the Company's class A common stock during the period.

+ References

No definition available.

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- Definition

Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(03)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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- Definition

Net number of non-option equity instruments granted to participants.

+ References

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-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(01)
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- Definition

Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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