Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:
Consolidated net income (loss)	$ (1,040)	$ 47,044
Adjustments to reconcile consolidated net income (loss) to net cash provided by (used in) operating activities:
Fixed asset depreciation and intangible asset amortization	38,253	37,154
Employee loan amortization and reserves on employee loans	25,467	24,387
Equity-based compensation and allocations of net income to limited partnership units and FPUs	208,017	104,009
Deferred compensation expense	20	62
Losses (gains) on equity method investments	(4,474)	(5,532)
Unrealized/realized losses (gains) on financial instruments owned, at fair value and other investments	1,386	(1,810)
Amortization of discount (premium) on notes payable	1,904	1,396
Impairment of fixed assets, intangible assets and investments	2,767	5,226
Deferred tax provision (benefit)	(5,534)	653
Change in estimated acquisition earn-out payables	613	(454)
Forfeitures of Class A common stock	(796)	(17)
Other	0	823
Consolidated net income (loss), adjusted for non-cash and non-operating items	266,583	212,941
Decrease (increase) in operating assets:
Reverse repurchase agreements	(200,000)	0
Financial instruments owned, at fair value	(199)	2,319
Receivables from broker-dealers, clearing organizations, customers and related broker-dealers	(700,609)	(1,576,645)
Accrued commissions receivable, net	(26,077)	(14,362)
Loans, forgivable loans and other receivables from employees and partners, net	(23,681)	(34,701)
Receivables from related parties	(7,591)	(3,652)
Other assets	(1,893)	(9,878)
Increase (decrease) in operating liabilities:
Repurchase agreements	0	900
Accrued compensation	(4,731)	(21,387)
Payables to broker-dealers, clearing organizations, customers and related broker-dealers	660,692	1,516,012
Payables to related parties	(3,949)	36,331
Accounts payable, accrued and other liabilities	(39,741)	(53,910)
Net cash provided by (used in) operating activities	(81,196)	53,968
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of fixed assets	(7,081)	(3,444)
Capitalization of software development costs	(24,470)	(22,445)
Purchase of equity method investments	0	(466)
Proceeds from equity method investments	3,021	1,534
Payments for acquisitions, net of cash and restricted cash acquired	(26,502)	0
Purchase of assets	(240)	0
Net cash provided by (used in) investing activities	(55,272)	(24,821)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayments of long-term debt and collateralized borrowings	(173,251)	(3,177)
Issuance of long-term debt and collateralized borrowings, net of deferred issuance costs	516,579	(33)
Earnings distributions to limited partnership interests and other noncontrolling interests	(13,818)	(16,629)
Redemption and repurchase of limited partnership interests	(101,496)	(26,758)
Dividends to stockholders	(7,558)	(7,443)
Repurchase of Class A common stock	(46,481)	(26,408)
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	164,894	(83,885)
Effect of exchange rate changes on Cash and cash equivalents and Cash segregated under regulatory requirements	12,171	(2,920)
Net increase (decrease) in Cash and cash equivalents, and Cash segregated under regulatory requirements	40,597	(57,658)
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	542,607	509,141
Supplemental cash information:
Cash paid during the period for taxes	32,878	23,089
Cash paid during the period for interest	30,812	26,419
Supplemental non-cash information:
Issuance of Class A common stock upon exchange of limited partnership interests	45,868	12,779
Issuance of Class A and contingent Class A common stock and limited partnership interests for acquisitions	2,761	2,710
ROU assets and liabilities	$ 2,495	$ 15,693