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Compensation - Activity Associated with Limited Partnership Units (Details) - shares | 6 Months Ended | 12 Months Ended
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Jun. 30, 2024 | Dec. 31, 2023
NEWMARK Group Inc |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding |  |
Beginning balance (in shares) | 42,376,966 | 30,687,954
Number of units, Issued (in shares) | 9,040,073 | 16,092,841
Number of units, Redeemed/exchanged units (in shares) | (2,462,482) | (3,676,057)
Number of units, Forfeited units/other (in shares) | (398,037) | (727,772)
Ending balance (in shares) | 48,556,520 | 42,376,966
Exchangeable units (in shares) | 13,382,806 | 12,189,148
NEWMARK Group Inc | Limited Partnership Units |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding |  |
Beginning balance (in shares) | 3,100,000 |
Ending balance (in shares) | 2,800,000 | 3,100,000
Exchangeable partnership units (in shares) | 1,900,000 | 1,500,000
NEWMARK Group Inc | Limited Partnership Units | Employee |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding |  |
Ending balance (in shares) | 2,200,000 |
BGC Holdings, L.P. |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding |  |
Beginning balance (in shares) | 0 | 5,459,388
Number of units, Issued (in shares) | 0 | 1,506
Number of units, Redeemed/exchanged units (in shares) | 0 | (5,459,895)
Number of units, Forfeited units/other (in shares) | 0 | (999)
Ending balance (in shares) | 0 | 0
Exchangeable units (in shares) | 0 | 0
BGC Holdings, L.P. | Limited Partnership Units |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding |  |
Ending balance (in shares) | 0 |

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- Definition Exchangeable Partnership Units + References No definition available. + Details
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- Definition Exchangeable Units + References No definition available. + Details
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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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(03) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + 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 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + 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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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