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Credit Enhancement Receivable, Credit Enhancement Deposit and Contingent Liability - Narrative (Details) - USD ($)		3 Months Ended
	Mar. 23, 2021	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Credit Enhancement Receivable Contingent Liability And Credit Enhancement Deposit
Credit enhancement receivable		$ 0		$ 0
Deposit in Fannie Mae restricted liquidity account		25,000,000.0		25,000,000.0
Returned the credit enhancement deposit	$ 25,000,000
DB Cayman | Credit Risk
Credit Enhancement Receivable Contingent Liability And Credit Enhancement Deposit
Reimbursements under serving agreement		$ 0	$ 0
Percentage of contingent payment (in percentage)		50.00%
Contingent liability				$ 12,300,000

X

- Definition

Credit enhancement receivable.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

Credit enhancement receivable contingent liability and credit enhancement deposit.

+ References

No definition available.

+ Details

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X

- Definition

Percentage of contingent payment.

+ References

No definition available.

+ Details

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- Definition

Reimbursements under serving agreement.

+ References

No definition available.

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Balance Type:	credit
Period Type:	duration

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- Definition

Repayment Of Security Deposit

+ References

No definition available.

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Namespace Prefix:	nmrk_
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Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

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Period Type:	instant

X

- Definition

The amount of an asset, typically cash, provided to a counterparty to provide certain assurance of performance by the entity pursuant to the terms of a written or oral agreement, such as a lease.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.8,17)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Details

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- Details

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