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Credit Enhancement Receivable, Credit Enhancement Deposit and Contingent Liability - Narrative (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 23, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Mar. 09, 2021 | Dec. 31, 2020
Credit Enhancement Receivable Contingent Liability And Credit Enhancement Deposit |  |  |  |  |  |  |
Credit enhancement receivable |  | $ 0 |  | $ 0 |  |  | $ 0
Deposit in Fannie Mae restricted liquidity account |  | 25,000,000.0 |  | 25,000,000.0 |  | $ 25,000,000.0 | 25,000,000.0
Returned the credit enhancement deposit | $ 25,000,000.0 |  |  |  |  |  |
DB Cayman | Credit Risk |  |  |  |  |  |  |
Credit Enhancement Receivable Contingent Liability And Credit Enhancement Deposit |  |  |  |  |  |  |
Reimbursements under serving agreement |  | 0 | $ 0 | 0 | $ 0 |  |
Percentage of contingent payment (in percentage) |  |  |  |  |  | 50.00% |
Contingent liability |  | $ 0 |  | $ 0 |  |  | $ 12,300,000

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- Definition Credit enhancement receivable. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Credit enhancement receivable contingent liability and credit enhancement deposit. + References No definition available. + Details
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Namespace Prefix: | nmrk_
Data Type: | xbrli:stringItemType
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- Definition Percentage of contingent payment. + References No definition available. + Details
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Namespace Prefix: | nmrk_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Reimbursements under serving agreement. + References No definition available. + Details
Name: | nmrk_ReimbursementsUnderServingAgreement
Namespace Prefix: | nmrk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Repayment Of Security Deposit + References No definition available. + Details
Name: | nmrk_RepaymentOfSecurityDeposit
Namespace Prefix: | nmrk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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 + Details
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Balance Type: | credit
Period Type: | instant

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- 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 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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- Details
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