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Compensation - Schedule of Compensation Expense Related to Issuance of Common Stock and Grants of Exchangeability (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Issuance of common stock and exchangeability expenses	$ 165,797	$ 110,973	$ 85,918

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- Definition

Common Stock, Exchangeability Granted, Issued, Expense

+ References

No definition available.

+ Details

Name:	nmrk_CommonStockExchangeabilityGrantedIssuedExpense
Namespace Prefix:	nmrk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration