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Compensation - Activity Associated with LPU's Held by BGC Employees (Detail) - LPUs - shares | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] |  |  |
Number of Units, Balance outstanding at beginning of period (in shares) | 110,348,000 | 112,115,000 | 137,652,000
Number of Units, Granted (in shares) | 9,688,000 | 27,968,000 | 34,093,000
Number of Units, Redeemed/exchanged units (in shares) | (119,812,000) | (24,623,000) | (58,832,000)
Number of Units, Forfeited units (in shares) | (224,000) | (5,112,000) | (798,000)
Number of Units, Balance outstanding at end of period (in shares) | 0 | 110,348,000 | 112,115,000
Newmark Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] |  |  |
Number of Units, Balance outstanding at beginning of period (in shares) | 9,351,000 | 11,051,000 | 13,202,000
Number of Units, Granted (in shares) | 0 | 0 | 0
Number of Units, Redeemed/exchanged units (in shares) | (572,000) | (1,636,000) | (1,881,000)
Number of Units, Forfeited units (in shares) | 0 | (64,000) | (270,000)
Number of Units, Balance outstanding at end of period (in shares) | 8,779,000 | 9,351,000 | 11,051,000

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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 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -SubTopic 10 -Topic 718 -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)(1) -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 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -SubTopic 10 -Topic 718 -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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