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Compensation - Activity Associated with Limited Partnership Units (Details) - shares | 3 Months Ended | 12 Months Ended
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Mar. 31, 2023 | Dec. 31, 2022
NEWMARK Group Inc Parent |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding |  |
Beginning balance (in shares) | 30,687,954 | 18,419,613
Number of units, Issued (in shares) | 3,290,471 | 15,402,041
Number of units, Redeemed/exchanged units (in shares) | (1,067,815) | (2,934,984)
Number of units, Forfeited units (in shares) | (50,005) | (198,716)
Ending balance (in shares) | 32,860,605 | 30,687,954
Exchangeable units (in shares) | 7,806,770 | 7,861,359
NEWMARK Group Inc Parent | Limited Partnership Units |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding |  |
Beginning balance (in shares) | 3,900,000 |
Ending balance (in shares) | 3,700,000 | 3,900,000
Exchangeable partnership units (in shares) | 1,400,000 | 1,500,000
NEWMARK Group Inc Parent | Limited Partnership Units | Employee |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding |  |
Ending balance (in shares) | 1,400,000 |
BGC Holdings, L.P. |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding |  |
Beginning balance (in shares) | 5,459,388 | 8,663,930
Number of units, Issued (in shares) | 0 | 25,032
Number of units, Redeemed/exchanged units (in shares) | (308,854) | (3,169,063)
Number of units, Forfeited units (in shares) | (999) | (60,511)
Ending balance (in shares) | 5,149,535 | 5,459,388
Exchangeable units (in shares) | 2,456,456 | 2,654,749
BGC Holdings, L.P. | Limited Partnership Units |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding |  |
Beginning balance (in shares) | 4,800,000 |
Ending balance (in shares) | 4,600,000 | 4,800,000
Exchangeable partnership units (in shares) | 2,300,000 | 2,500,000
BGC Holdings, L.P. | Limited Partnership Units | Employee |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding |  |
Ending balance (in shares) | 35,000 |

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- Definition Exchangeable Partnership Units + References No definition available. + Details
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Period Type: | instant

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- Definition Exchangeable Units + References No definition available. + Details
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Period Type: | duration

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- Definition Number of exchangeable limited partnership units redeemed or exchanged into the Company's class A common stock during the period. + References No definition available. + Details
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- Definition Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event. + 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)(3) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- 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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- 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 https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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