Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:
Consolidated net income (loss)	$ 17,512	$ 55,269
Adjustments to reconcile consolidated net income (loss) to net cash provided by (used in) operating activities:
Fixed asset depreciation and intangible asset amortization	60,117	55,786
Employee loan amortization and reserves on employee loans	35,645	35,083
Equity-based compensation and allocations of net income to limited partnership units and FPUs	277,285	161,739
Deferred compensation expense	38	75
Losses (gains) on equity method investments	(6,568)	(8,762)
Unrealized/realized losses (gains) on financial instruments owned, at fair value and other investments	914	1,434
Amortization of discount (premium) on notes payable	2,708	2,099
Impairment of fixed assets, intangible assets and investments	3,013	5,568
Deferred tax provision (benefit)	(22,678)	2,025
Change in estimated acquisition earn-out payables	723	(516)
Forfeitures of Class A common stock	(796)	(188)
Other	0	(1,914)
Consolidated net income (loss), adjusted for non-cash and non-operating items	367,913	307,698
Decrease (increase) in operating assets:
Financial instruments owned, at fair value	(5,562)	2,976
Receivables from broker-dealers, clearing organizations, customers and related broker-dealers	(614,776)	(1,416,538)
Accrued commissions receivable, net	(26,848)	(4,081)
Loans, forgivable loans and other receivables from employees and partners, net	(47,525)	(51,719)
Receivables from related parties	(4,570)	(1,522)
Other assets	6,348	(10,829)
Increase (decrease) in operating liabilities:
Repurchase agreements	0	1,013
Accrued compensation	(6,902)	(23,341)
Payables to broker-dealers, clearing organizations, customers and related broker-dealers	597,329	1,355,361
Payables to related parties	9,243	24,689
Accounts payable, accrued and other liabilities	(42,949)	(51,770)
Net cash provided by (used in) operating activities	231,701	131,937
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of fixed assets	(9,101)	(6,434)
Capitalization of software development costs	(33,946)	(35,075)
Purchase of equity method investments	0	(588)
Proceeds from equity method investments	9,467	6,118
Payments for acquisitions, net of cash and restricted cash acquired	(26,502)	0
Purchase of assets	(399)	(445)
Net cash provided by (used in) investing activities	(60,481)	(36,424)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayments of long-term debt and collateralized borrowings	(623,251)	(4,779)
Issuance of long-term debt and collateralized borrowings, net of deferred issuance costs	755,212	(45)
Earnings distributions to limited partnership interests and other noncontrolling interests	(19,041)	(25,244)
Redemption and repurchase of equity awards	(102,494)	(46,310)
Dividends to stockholders	(12,267)	(11,143)
Repurchase of Class A common stock	(86,537)	(79,295)
Proceeds from sale of Cantor Units in BGC Holdings	11,539	947
Short term borrowings, net of repayments	(1,917)	0
Payments on acquisition earn-outs	(18,703)	(4,384)
Net cash provided by (used in) financing activities	(97,459)	(170,253)
Effect of exchange rate changes on Cash and cash equivalents and Cash segregated under regulatory requirements	223	(6,198)
Net increase (decrease) in Cash and cash equivalents, and Cash segregated under regulatory requirements	73,984	(80,938)
Cash and cash equivalents and Cash segregated under regulatory requirements at beginning of period	502,010	566,799
Cash and cash equivalents and Cash segregated under regulatory requirements at end of period	575,994	485,861
Supplemental cash information:
Cash paid during the period for taxes	47,449	32,267
Cash paid during the period for interest	47,791	39,864
Supplemental non-cash information:
Issuance of Class A common stock upon exchange of limited partnership interests	45,868	34,480
Issuance of Class A and contingent Class A common stock and limited partnership interests for acquisitions	7,275	2,710
ROU assets and liabilities	$ 27,075	$ 16,494