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Compensation - Summary of the BGC Holdings and Newmark Holdings LPUs Held by BGC Employees (Detail) - LPUs - Newmark - shares	Sep. 30, 2024	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance outstanding (in shares)	6,429,000	8,779,000
Regular Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance outstanding (in shares)	4,597,000
Preferred Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance outstanding (in shares)	1,832,000

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