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Earnings Per Share - Narrative (Detail) - shares
shares in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from computation of earnings per share amount (in shares) 16.0 17.0
Contingent Class A Common Stock | BGC Holdings Partnership Unit    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from computation of earnings per share amount (in shares) 53.3 60.2
Contingent Class A Common Stock | Limited Partnership Unit    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from computation of earnings per share amount (in shares) 53.3 60.2
Contingent Class A Common Stock | N Units    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from computation of earnings per share amount (in shares) 53.3 60.2
Restricted Stock Units (RSUs)    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from computation of earnings per share amount (in shares) 15.6 14.4
Restricted Stock Units (RSUs) | Contingent Class A Common Stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from computation of earnings per share amount (in shares) 53.3 60.2
Earnings RSAs    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from computation of earnings per share amount (in shares) 0.4 2.6