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Compensation - Schedule of Activity Associated with Limited Partnership Units (Details) - shares | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Newmark Holdings Units |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding |  |
Beginning balance (in shares) | 51,796,454 | 42,376,966
Issued (in shares) | 10,735,416 | 16,440,711
Redeemed/exchanged units (in shares) | (11,541,874) | (6,166,506)
Number of units, Forfeited units/other (in shares) | (1,149,640) | (854,717)
Ending balance (in shares) | 49,840,356 | 51,796,454
Exchangeable units (in shares) | 12,378,576 | 13,906,798
Newmark Holdings Units | Limited Partnership Units |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding |  |
Beginning balance (in shares) | 2,700,000 |
Ending balance (in shares) | 2,200,000 | 2,700,000
Exchangeable partnership units (in shares) | 1,400,000 | 1,800,000
Newmark Holdings Units | 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 Units | 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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Balance Type: | na
Period Type: | instant

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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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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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