CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:
Consolidated net income (loss)	$ 123,228	$ 38,775	$ 58,867
Adjustments to reconcile consolidated net income (loss) to net cash provided by (used in) operating activities:
Fixed asset depreciation and intangible asset amortization	81,434	80,417	75,054
Employee loan amortization and reserves on employee loans	59,413	51,313	49,533
Equity-based compensation and allocations of net income to limited partnership units and FPUs	369,143	355,378	251,071
Deferred compensation expense	51	54	(542)
Losses (gains) on equity method investments	(8,430)	(9,152)	(10,920)
Unrealized/realized losses (gains) on financial instruments owned, at fair value and other investments	(38,577)	(4,406)	1,208
Amortization of discount (premium) on notes payable	1,286	3,662	2,801
Impairment of fixed assets, intangible assets and investments	746	3,144	6,139
Deferred tax provision (benefit)	(69,754)	(60,556)	(14,628)
Change in estimated acquisition earn-out payables	1,146	1,442	1,034
Forfeitures of Class A common stock	(1,065)	(1,190)	(263)
Loss (gain) on divestiture	(39,019)	0	1,029
Other	10,663	0	(1,914)
Consolidated net income (loss), adjusted for non-cash and non-operating items	490,265	458,881	418,469
Decrease (increase) in operating assets:
Financial instruments owned, at fair value	(143,433)	(5,475)	2,383
Receivables from broker-dealers, clearing organizations, customers and related broker-dealers	(21,584)	212,490	222,567
Accrued commissions receivable, net	(20,803)	(5,750)	6,287
Loans, forgivable loans and other receivables from employees and partners, net	(20,057)	(77,464)	(61,205)
Receivables from related parties	(3,890)	(1,380)	3,621
Other assets	(10,674)	19,803	(8,469)
Increase (decrease) in operating liabilities:
Accrued compensation	19,603	18,450	(25,178)
Payables to broker-dealers, clearing organizations, customers and related broker-dealers	23,319	(203,902)	(252,490)
Payables to related parties	11,504	24,145	(43,782)
Accounts payable, accrued and other liabilities	(8,900)	(34,595)	(37,841)
Net cash provided by (used in) operating activities	315,350	405,203	224,362
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from disposal of subsidiary	45,741	0	512
Purchases of fixed assets	(29,624)	(14,924)	(10,591)
Capitalization of software development costs	(42,431)	(44,974)	(48,169)
Purchase of equity method investments	(1,750)	0	(588)
Proceeds from equity method investments	9,026	9,421	6,118
Payments for acquisitions, net of cash acquired	(64,174)	(39,755)	0
Purchase of investment carried under measurement alternative	(13,155)	0	0
Loan to related parties	(180,000)	0	0
Repayment of loan to related parties	180,000	0	0
Purchase of other assets	(627)	(475)	(612)
Net cash provided by (used in) investing activities	(96,994)	(90,707)	(53,330)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayments of long-term debt borrowings	(815,000)	(623,251)	(6,391)
Issuance of long-term debt, net of deferred issuance costs	965,057	754,321	(75)
Earnings distributions to limited partnership interests and other noncontrolling interests	(7,805)	(19,041)	(28,877)
Redemption and repurchase of equity awards	(138,894)	(117,867)	(76,219)
Dividends to stockholders	(34,165)	(17,381)	(14,859)
Repurchase of Class A common stock	(262,211)	(114,580)	(103,888)
Proceeds from sale of Cantor units in BGC Holdings	0	11,539	1,487
Proceeds from non-controlling interests	171,667	0	0
Payments on acquisition earn-outs	(1,000)	(18,703)	(4,384)
Other	(26,667)	0	0
Net cash provided by (used in) financing activities	(149,018)	(146,880)	(233,206)
Effect of exchange rate changes on Cash and cash equivalents, and Cash segregated under regulatory requirements	(8,961)	3,270	(2,615)
Net increase (decrease) in cash and cash equivalents	60,377	170,886	(64,789)
Less: net increase (decrease) in cash classified within assets held for sale	0	0	0
Cash and cash equivalents, and Cash segregated under regulatory requirements at beginning of period	672,896	502,010	566,799
Cash and cash equivalents, and Cash segregated under regulatory requirements at end of period	733,273	672,896	502,010
Supplemental cash information:
Cash paid during the period for taxes	103,524	70,718	35,782
Cash paid during the period for interest	88,392	80,664	53,655
Supplemental non-cash information:
Issuance of Class A common stock upon exchange of limited partnership interests	0	45,868	34,889
Issuance of Class A and contingent Class A common stock and limited partnership interests for acquisitions	8,520	7,275	2,710
ROU assets and liabilities	20,109	27,201	44,123
Related Party
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayment of short-term borrowings from related parties	(275,000)	0	0
Issuance of short term borrowings from related parties	275,000	0	0
Nonrelated Party
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayment of short-term borrowings from related parties	$ 0	$ (1,917)	$ 0