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Condensed Consolidated Statements of Changes in Equity (Parenthetical) - shares
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Grant of exchangeability and redemption of limited partnership interests, issuance of shares (in shares)   11,939,546 29,118,664 23,647,165
Repurchase of class A common stock (in shares) 8,087,000 12,397,000 18,747,000 21,142,000
Issuance of Class A common stock and RSUs for acquisitions (in shares)       1,192,907
Cantor purchase of Cantor units from BGC Holdings upon redemption of FPUs (in shares)     6,368,964 480,175
Issuance of restricted stock upon redemption of limited partnership interests (in shares) 38,610,233 0 38,610,233 0
Conversion of Class B Common Stock to Class A Common Stock (in shares)     405,801  
Reallocation of Treasury Stock due to Corporate Conversion (in shares) 156,386,616   156,386,616  
Class A Common Stock        
Equity-based compensation (in shares) 6,490,733 448,014 9,120,746 3,018,337
Grant of exchangeability and redemption of limited partnership interests, issuance of shares (in shares) 346,000 11,940,000 30,572,000 23,654,000
Issuance of common stock (in shares) 55,348   234,931  
Redemption of FPUs (in shares)   27,087   96,447
Repurchase of class A common stock (in shares) 8,086,750 12,396,735 18,746,467 21,142,045
Forfeiture of class A common stock (in shares) 0 43,388 238,927 47,807
Issuance of Class A common stock and RSUs for acquisitions (in shares) 413,884 0 4,566,000 1,186,000
Conversion, shares issued (in shares) 200,000 5,800,000 20,400,000 13,700,000
Class A Common Stock | Partnership Units        
Issuance of common stock (in shares)   101,786   445,245
Redemption of FPUs (in shares)     156,049  
Class A Common Stock | Smith Mack        
Issuance of Class A common stock and RSUs for acquisitions (in shares)     5,504,698  
Class B Common Stock        
Issuance of common stock (in shares) 64,000,000   64,000,000  
Conversion, shares issued (in shares) 63,974,374   63,974,374  
Conversion of Class B Common Stock to Class A Common Stock (in shares) 405,801