XML 134 R122.htm IDEA: XBRL DOCUMENT
v3.19.2

Compensation - Additional Information (Detail) $ in Thousands |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 01, 2018 | Jun. 30, 2019 USD ($) shares | Jun. 30, 2018 USD ($) shares | Jun. 30, 2019 USD ($) shares | Jun. 30, 2018 USD ($) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 shares | Dec. 13, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares granted during period |  |  |  | 15,700,000 |  |  |  |
Shares authorized to be delivered allowed for grant of future awards |  | 384,300,000 |  | 384,300,000 |  |  |  |
Income allocated to limited partnership units | $ |  | $ 11,600 | $ 4,600 | $ 17,900 | $ 8,800 |  |  |
Unrecognized compensation expense related to unvested RSUs | $ |  | 17,600 |  | 17,600 |  |  |  |
Deferred cash compensation expense recognized | $ |  | 200 | 400 |  |  |  |  |
Liability for deferred cash compensation awards | $ |  | 1,100 |  | 1,100 |  | $ 1,500 |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Compensation expense (benefit) before income tax related to limited partnership units | $ |  | $ 1,000 |  | $ 1,800 |  |  |  |
N Units [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares granted during period |  | 7,600,000 |  | 7,600,000 |  |  |  |
Executives And Non-Executives Employees [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Notional value with post-termination pay-out amount | $ |  | $ 83,800 |  | $ 83,800 |  | 92,700 |  |
Aggregate estimated fair value of limited partnership units | $ |  | 26,600 |  | 26,600 |  | $ 22,600 |  |
Limited Partnership Units [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Compensation expense (benefit) before income tax related to limited partnership units | $ |  | $ 24,000 | $ 1,800 | $ 30,300 | $ (6,900) |  |  |
Limited Partnership Units [Member] | Employees and Directors [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Awards granted |  |  |  | 2,200,000 | 200,000 |  |  |
Aggregate estimated grant date fair values | $ |  |  |  | $ 16,500 | $ 2,900 |  |  |
Newmark Holdings, L.P. [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of limited partnership units granted exchangeability |  | 24,000 | 2,200,000 | 54,000 | 3,300,000 |  |  |
Compensation expense (benefit) before income tax related to limited partnership units | $ |  | $ 2,600 | $ 60,300 | $ 3,200 | $ 82,100 |  |  |
Number of units redeemed |  | 1,000 |  |  |  |  |  |
Expense related to units redeemed | $ |  | $ 7 |  |  |  |  |  |
Aggregate estimated grant date fair value of outstanding RSUs | $ |  | $ 18,400 | $ 2,900 | $ 18,400 | $ 2,900 |  |  |
Newmark Holdings, L.P. [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Limited partnership units outstanding |  | 2,326,662 |  | 2,326,662 |  | 219,887 |  |
Awards granted |  |  |  | 2,191,303 |  | 264,532 |  |
Newmark Holdings, L.P. [Member] | Executives And Non-Executives Employees [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Notional value with post-termination pay-out amount | $ |  | $ 120,900 |  | $ 120,900 |  |  |  |
Aggregate estimated fair value of limited partnership units | $ |  | $ 14,700 |  | $ 14,700 |  |  |  |
Number of unvested limited partnership units with post-termination pay-out |  | 4,700,000 |  | 4,700,000 |  |  |  |
Limited partners capital account units held by BGC |  | 2,100,000 |  | 2,100,000 |  | 1,500,000 |  |
Newmark Holdings, L.P. [Member] | Non Executive [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Notional value with post-termination pay-out amount | $ |  | $ 20,700 |  | $ 20,700 |  |  |  |
Aggregate estimated fair value of limited partnership units | $ |  | $ 19,000 |  | $ 19,000 |  |  |  |
Number of unvested limited partnership units with post-termination pay-out |  | 1,700,000 |  | 1,700,000 |  |  |  |
Newmark Holdings, L.P. [Member] | Share Equivalent Limited Partnership Units [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Limited partnership units outstanding |  | 59,445,626 | 44,700,000 | 59,445,626 | 44,700,000 | 44,733,487 | 29,413,143 |
Awards granted |  |  |  | 10,746,929 |  | 19,141,943 |  |
Newmark Holdings, L.P. [Member] | Executives And Non-Executives Employees [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Aggregate estimated fair value of limited partnership units | $ |  | $ 14,700 |  | $ 14,700 |  |  |  |
Number of unvested limited partnership units with post-termination pay-out |  | 10,000,000.0 |  | 10,000,000.0 |  | 3,800,000 |  |
Limited partners capital account units held by BGC |  | 7,100,000 |  | 7,100,000 |  |  |  |
BGC Holdings, L.P. [Member] | Executives And Non-Executives Employees [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of unvested limited partnership units with post-termination pay-out |  | 7,500,000 |  | 7,500,000 |  | 8,400,000 |  |
Limited partners capital account units held by BGC |  | 2,300,000 |  | 2,300,000 |  | 3,300,000 |  |
BGC Holdings, L.P. [Member] | Non Executive [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of unvested limited partnership units with post-termination pay-out |  | 1,200,000 |  | 1,200,000 |  |  |  |
NEWMARK Group Inc Parent [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Aggregate estimated grant date fair value of outstanding RSUs | $ |  | $ 800 | $ 2,100 | $ 800 | $ 2,100 |  |  |
Unrecognized compensation expense related to unvested RSUs | $ |  | 1,000 |  | $ 1,000 |  |  |  |
NEWMARK Group Inc Parent [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Compensation expense (benefit) before income tax related to limited partnership units | $ |  | $ 200 | $ 200 |  |  |  |  |
BGC Holdings, L.P. [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of limited partnership units granted exchangeability |  | 233,000 | 5,000,000.0 | 292,000 | 6,700,000 |  |  |
Number of units redeemed |  | 0 |  |  |  |  |  |
Restricted stock unit, Conversion description |  |  |  | Each RSU is settled into one share of Newmark Class A common stock upon completion of the vesting period. |  |  |  |
BGC Holdings, L.P. [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Limited partnership units outstanding |  | 73,829 |  | 73,829 |  | 168,675 | 346,538 |
Awards granted |  |  |  |  |  | 3,439 |  |
BGC Holdings, L.P. [Member] | Employees and Directors [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Awards granted |  |  |  | 0 | 200,000 |  |  |
Aggregate estimated grant date fair values | $ |  |  |  | $ 0 | $ 2,900 |  |  |
BGC Holdings, L.P. [Member] | Limited Partnership Units [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Limited partnership units outstanding |  | 58,118,793 | 61,900,000 | 58,118,793 | 61,900,000 | 61,870,969 | 64,708,915 |
Awards granted |  |  |  | 270,515 |  | 2,872,825 |  |
Maximum [Member] | Limited Partnership Units [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Restricted shares, restriction period |  |  |  | 5 years |  |  |  |
Maximum [Member] | Limited Partnership Units [Member] | Employees and Directors [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Restricted shares, restriction period |  |  |  | 8 years |  |  |  |
Maximum [Member] | BGC Holdings, L.P. [Member] | Employees and Directors [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Restricted shares, restriction period |  |  |  | 4 years |  |  |  |
Minimum [Member] | Limited Partnership Units [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Restricted shares, restriction period |  |  |  | 3 years |  |  |  |
Minimum [Member] | Limited Partnership Units [Member] | Employees and Directors [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Restricted shares, restriction period |  |  |  | 2 years |  |  |  |
Minimum [Member] | BGC Holdings, L.P. [Member] | Employees and Directors [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Restricted shares, restriction period |  |  |  | 2 years |  |  |  |
Class A Common Stock [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Limited partnership units exchange ratio |  |  |  | 0.9495 |  |  |  |
Class A Common Stock [Member] | Newmark Holdings, L.P. [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted |  |  |  | 10,300,000 |  | 9,300,000 |  |
Class A Common Stock [Member] | BGC Holdings, L.P. [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted |  |  |  | 25,800,000 |  | 26,000,000.0 |  |
Class A Common Stock [Member] | Maximum [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Restricted shares, restriction period | 4 years |  |  |  |  |  |  |
Class A Common Stock [Member] | Minimum [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Restricted shares, restriction period | 2 years |  |  |  |  |  |  |
Newmark Equity Plan [Member] | Class A Common Stock [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares registered to be delivered pursuant to awards granted |  |  |  |  |  |  |  | 50,000,000.0
Newmark Equity Plan [Member] | Class A Common Stock [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares authorized to be delivered pursuant to awards granted |  |  |  |  |  |  |  | 400,000,000.0

X
- Definition Estimated fair value of limited partnership units held by executives and non-executive employees, awarded in lieu of cash compensation for salaries, commissions and/or discretionary or guaranteed bonuses. + References No definition available. + Details
Name: | nmrk_EstimatedFairValueOfLimitedPartnershipUnits
Namespace Prefix: | nmrk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Estimated grant date fair value of outstanding RSU. + References No definition available. + Details
Name: | nmrk_EstimatedGrantDateFairValueOfOutstandingRsu
Namespace Prefix: | nmrk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of limited partnership units granted exchangeability into the company's class A common stock during the period. + References No definition available. + Details
Name: | nmrk_ExchangeabilityGrantedNumberOfUnits
Namespace Prefix: | nmrk_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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: | duration

X
- Definition Notional value of limited partnership units with post termination pay out amount. + References No definition available. + Details
Name: | nmrk_NotionalValueOfLimitedPartnershipUnitsWithPostTerminationPayOutAmount
Namespace Prefix: | nmrk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Restricted Stock Units Vesting Description + References No definition available. + Details
Name: | nmrk_RestrictedStockUnitsVestingDescription
Namespace Prefix: | nmrk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share based compensation arrangement by share based payment award equity instruments other than options outstanding grant date fair value. + References No definition available. + Details
Name: | nmrk_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingGrantDateFairValue
Namespace Prefix: | nmrk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Share-based compensation arrangement by share-based payment award, number of shares registered. + References No definition available. + Details
Name: | nmrk_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesRegistered
Namespace Prefix: | nmrk_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Share based compensation arrangement by share based payment award units redeemed. + References No definition available. + Details
Name: | nmrk_ShareBasedCompensationArrangementByShareBasedPaymentAwardUnitsRedeemed
Namespace Prefix: | nmrk_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share based compensation expense related to units redeemed. + References No definition available. + Details
Name: | nmrk_ShareBasedCompensationExpenseRelatedToUnitsRedeemed
Namespace Prefix: | nmrk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_AllocatedShareBasedCompensationExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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=98513485&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=98513485&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=98513485&loc=d3e4332-108586 + Details
Name: | us-gaap_ConversionOfStockSharesConverted1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The compensation expense recognized during the period pertaining to the deferred compensation arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
Name: | us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements. Represents currently earned compensation under cash arrangements (such as a profit-sharing plan, rabbi trust, and employee contract--excluding equity-based arrangements) that is not actually paid until a later date. + References No definition available. + Details
Name: | us-gaap_DeferredCompensationCashbasedArrangementsLiabilityCurrentAndNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of equity impact of cash distribution declared to unit-holder of limited partnership (LP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055 + Details
Name: | us-gaap_DistributionMadeToLimitedPartnerCashDistributionsDeclared
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The number of limited partner units outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB Topic 4.F) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055 + Details
Name: | us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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 (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Net number of non-option equity instruments granted to participants. + 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 (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. + 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 (c)(1)(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of share instruments newly issued under a share-based compensation plan. + 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 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_TitleOfIndividualAxis=nmrk_ExecutivesAndNonExecutivesEmployeesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PartnerTypeOfPartnersCapitalAccountAxis=nmrk_LimitedPartnershipUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TitleOfIndividualAxis=nmrk_EmployeesAndDirectorsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_TitleOfIndividualAxis=nmrk_NonExecutiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PartnerTypeOfPartnersCapitalAccountAxis=nmrk_ShareEquivalentLimitedPartnershipUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=nmrk_BGCHoldingsLimitedPartnershipMember
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: |

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

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
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_PlanNameAxis=nmrk_LongTermEquityIncentivePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |