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Compensation - Schedule of Units Redeemed in Connection with Issuance of Class A Common Stock (Details) - shares	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Parent Company
Share-based Compensation Arrangement by Share-based Payment Award
Newmark Holdings Units (in shares)	13,118,692	9,835,548	11,232,651

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- Definition

Share based compensation arrangement by share based payment award units redeemed.

+ References

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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.

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