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Notes Payable and Other Borrowings - Carrying Amounts and Estimated Fair Values of Company's Senior Notes (Detail) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Aug. 21, 2024
Jun. 10, 2024
Oct. 19, 2023
Oct. 06, 2023
May 25, 2023
Sep. 27, 2019
Debt Instrument [Line Items]                
Carrying Amount $ 1,836,090 $ 1,141,709            
Fair Value $ 1,899,052 1,182,143            
BGC Group 4.375% Senior Notes due December 15, 2025                
Debt Instrument [Line Items]                
Stated interest rate 4.375%       4.375% 4.375%    
Carrying Amount $ 287,829 287,462            
Fair Value $ 287,325 285,556            
BGC Partners 4.375% Senior Notes due December 15, 2025                
Debt Instrument [Line Items]                
Stated interest rate 4.375%             4.375%
Carrying Amount $ 11,836 11,824            
Fair Value $ 11,813 11,740            
BGC Group 8.000% Senior Notes due May 25, 2028                
Debt Instrument [Line Items]                
Stated interest rate 8.00%       8.00% 8.00%    
Carrying Amount $ 345,003 344,620            
Fair Value 371,238 369,065            
BGC Partners 8.000% Senior Notes due May 25, 2028                
Debt Instrument [Line Items]                
Stated interest rate     8.00%       8.00%  
Carrying Amount 2,260 2,257 $ 500          
Fair Value $ 2,430 2,416            
BGC Group 6.600% Senior Notes due June 10, 2029                
Debt Instrument [Line Items]                
Stated interest rate 6.60%     6.60%        
Carrying Amount $ 496,046 495,546            
Fair Value 517,377 513,366            
BGC Group 6.150% Senior Notes due April 2, 2030                
Debt Instrument [Line Items]                
Carrying Amount 693,116 0            
Fair Value $ 708,869 $ 0