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Condensed Consolidated Statements of Changes in Equity (Parenthetical) - $ / shares
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Equity-based compensation (in shares)   1,367,094
Grant of exchangeability and redemption of limited partnership interests, issuance of shares (in shares) 6,643,090 10,430,945
Repurchase of Class A common stock (in shares) 0 965,000
Cantor purchase of Cantor units from BGC Holdings upon redemption of FPUs (in shares)   2,768,060
Dividends declared per share of common stock (in dollars per share) $ 0.01 $ 0.01
Dividends declared and paid per share of common stock (in dollars per share) $ 0.01 $ 0.01
Partnership Units    
Redemption of FPUs (in shares)   617,208
Smith Mack    
Issuance of Class A common stock and RSUs for acquisitions (in shares)   250,575
Class A Common Stock    
Equity-based compensation (in shares) 1,981,088  
Grant of exchangeability and redemption of limited partnership interests, issuance of shares (in shares) 6,643,000 10,431,000
Issuance of Class A common stock (net of costs) (in shares) 4,956 262,373
Repurchase of Class A common stock (in shares)   964,471
Issuance of Class A common stock and RSUs for acquisitions (in shares) 912,000 251,000
Class A Common Stock | Partnership Units    
Redemption of FPUs (in shares) 29,388  
Class A Common Stock | Smith Mack    
Issuance of Class A common stock and RSUs for acquisitions (in shares) 911,677