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Financial Guarantee Liability - Summary of Provisions for Risk Sharing (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Guarantees [Abstract] |  |  |  |
Increase (decrease) to financial guarantee liability |  | $ (14) | $ 41 | $ (7)
Decrease (increase) to credit enhancement asset | [1] |  |  | 10
Total expense |  | $ (14) | $ 41 | $ 3
[1] | The credit enhancement recievable is included in “Other assets” in the accompanying consolidated balance sheets.

X
- Definition Decrease increase to credit enhancement asset. + References No definition available. + Details
Name: | nmrk_DecreaseIncreaseToCreditEnhancementAsset
Namespace Prefix: | nmrk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Increase decrease to financial guarantee liability. + References No definition available. + Details
Name: | nmrk_IncreaseDecreaseToFinancialGuaranteeLiability
Namespace Prefix: | nmrk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Provision for risk-sharing obligations. + References No definition available. + Details
Name: | nmrk_ProvisionForRiskSharingObligations
Namespace Prefix: | nmrk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_GuaranteesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration