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Compensation - Activity Associated with Limited Partnership Units Awarded to BGC Employees (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
LPUs | Newmark Holdings LPUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of units, redeemed (in shares)	49,000	62,000	148,000	123,000

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- Definition

Share-based compensation arrangement by share based payment award non option equity instrument redeemed.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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