Compensation - Schedule of Units Redeemed in Connection with Issuance of Class A Common Stock (Details) - shares	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Parent Company
Share-based Compensation Arrangement by Share-based Payment Award
Newmark Holdings Units (in shares)	3,322,996	3,387,780	7,202,694	7,693,750

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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+ Details