v3.26.1
Notes Payable and Other Borrowings - Carrying Amounts and Estimated Fair Values of Company's Senior Notes (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Nov. 10, 2025
Apr. 02, 2025
Aug. 21, 2024
Oct. 06, 2023
May 25, 2023
Debt Instrument [Line Items]              
Carrying Amount $ 1,538,825 $ 1,538,019          
Fair Value $ 1,594,265 1,623,468          
BGC Group 8.000% Senior Notes due May 25, 2028              
Debt Instrument [Line Items]              
Stated interest rate 8.00%   8.00%     8.00% 8.00%
Carrying Amount $ 345,579 345,387          
Fair Value $ 365,641 371,490          
BGC Partners 8.000% Senior Notes due May 25, 2028              
Debt Instrument [Line Items]              
Stated interest rate 8.00%       8.00%   8.00%
Carrying Amount $ 2,263 2,262     $ 500    
Fair Value $ 2,393 2,432          
BGC Group 6.600% Senior Notes due June 10, 2029              
Debt Instrument [Line Items]              
Stated interest rate 6.60%   6.60%        
Carrying Amount $ 496,798 496,548          
Fair Value $ 515,521 522,825          
BGC Group 6.150% Senior Notes due April 2, 2030              
Debt Instrument [Line Items]              
Stated interest rate 6.15%     6.15%      
Carrying Amount $ 694,185 693,822          
Fair Value $ 710,710 $ 726,721