XML 75 R64.htm IDEA: XBRL DOCUMENT
v3.21.1

Limited Partnership Interests in Newmark Holdings and BGC Holdings (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 tranche shares | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 13, 2017
Related Party Transaction |  |  |  |  |  |  |
Payout period for post-termination awards | 4 years |  |  |  |  |  |
Percentage to preferred units (in percentage) |  | 0.6875% | 0.6875% | 0.6875% | 0.6875% | 2.75% |
Non Distribution Earning Units |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |
Award vesting period (in years) | 4 years |  |  |  |  |  |
Common Class A |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |
Limited partnership units exchange ratio (in percentage) |  |  |  |  |  |  | 1
Common Class B | Cantor |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |
Exchangeable partnership units (in shares) | 23,700,000 |  |  |  |  |  |
Share converted (in shares) | 1 |  |  |  |  |  |
Newmark OpCo | RBC |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |
Exchangeable preferred limited partnership units, number of tranches | tranche | 4 |  |  |  |  |  |
NEWMARK Group Inc Parent | Common Class A |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |
Limited partnership units exchange ratio (in percentage) | 0.9365 |  |  |  |  |  |

X
- Definition Exchangeable Partnership Units + References No definition available. + Details
Name: | nmrk_ExchangeablePartnershipUnits
Namespace Prefix: | nmrk_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Exchangeable Preferred Limited Partnership Units, Number Of Tranches + References No definition available. + Details
Name: | nmrk_ExchangeablePreferredLimitedPartnershipUnitsNumberOfTranches
Namespace Prefix: | nmrk_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Limited partnership units exchange ratio. + References No definition available. + Details
Name: | nmrk_LimitedPartnershipUnitsExchangeRatio
Namespace Prefix: | nmrk_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of profits allocated to preferred partnership units. + References No definition available. + Details
Name: | nmrk_PercentageOfProfitsAllocatedToPreferredPartnershipUnits
Namespace Prefix: | nmrk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Post termination award payout period. + References No definition available. + Details
Name: | nmrk_PostTerminationAwardPayoutPeriod
Namespace Prefix: | nmrk_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4313-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586 + Details
Name: | us-gaap_ConversionOfStockSharesConverted1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_CapitalUnitsByClassAxis=nmrk_NonDistributionEarningUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=nmrk_CantorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=nmrk_NewmarkOpCoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=nmrk_TheRoyalBankOfCanadaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=srt_ParentCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |