Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Consolidated net income (loss)	$ 58,867	$ 153,488	$ 50,918
Adjustments to reconcile consolidated net income (loss) to net cash provided by (used in) operating activities:
Gain on Insurance Business Disposition	0	(312,941)	0
Fixed asset depreciation and intangible asset amortization	75,054	81,874	85,422
Employee loan amortization and reserves on employee loans	49,533	217,655	67,032
Equity-based compensation and allocations of net income to limited partnership units and FPUs	251,071	256,164	183,545
Deferred compensation expense	(542)	347	630
Losses (gains) on equity method investments	(10,920)	(6,706)	(1,126)
Unrealized/realized losses (gains) on financial instruments owned, at fair value and other investments	1,208	17	73
Amortization of discount (premium) on notes payable	2,801	3,592	4,187
Impairment of fixed assets, intangible assets and investments	6,139	11,246	11,431
Deferred tax provision (benefit)	(14,628)	(11,947)	(16,549)
Change in estimated acquisition earn-out payables	1,034	4,285	4,661
Forfeitures of Class A common stock	(263)	(553)	0
Loss (gain) on divestiture	1,029	0	0
Other	(1,914)	(4,915)	2,730
Consolidated net income (loss), adjusted for non-cash and non-operating items	418,469	391,606	392,954
Decrease (increase) in operating assets:
Financial instruments owned, at fair value	2,383	17,626	(1,346)
Receivables from broker-dealers, clearing organizations, customers and related broker-dealers	222,567	(482,669)	246,498
Accrued commissions receivable, net	6,287	(101,314)	44,389
Loans, forgivable loans and other receivables from employees and partners, net	(61,205)	(38,571)	(149,145)
Receivables from related parties	3,621	8,377	5,465
Other assets	(8,469)	1,543	(20,074)
Increase (decrease) in operating liabilities:
Financial instruments loaned, at fair value	0	0	(13,902)
Accrued compensation	(25,178)	17,989	13,752
Payables to broker-dealers, clearing organizations, customers and related broker-dealers	(252,490)	477,083	(236,314)
Payables to related parties	(43,782)	18,596	(37,613)
Accounts payable, accrued and other liabilities	(37,841)	106,919	57,949
Net cash provided by (used in) operating activities	224,362	417,185	302,613
CASH FLOWS FROM INVESTING ACTIVITIES:
Gross proceeds from Insurance Business Disposition	0	534,916	0
Cash and restricted cash transferred as part of Insurance Business Disposition	0	(369,407)	0
Proceeds from disposal of subsidiary	512	0	0
Purchases of fixed assets	(10,591)	(10,112)	(30,829)
Capitalization of software development costs	(48,169)	(43,178)	(54,342)
Purchase of equity method investments	(588)	(1,115)	(1,458)
Proceeds from equity method investments	6,118	10,029	4,326
Payments for acquisitions, net of cash acquired	0	0	(7,871)
Proceeds from sale of financial instruments owned, at fair value	0	0	14,237
Purchase of other assets	(612)	0	(2,000)
Net cash provided by (used in) investing activities	(53,330)	121,133	(77,937)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayments of debt and collateralized borrowings	(6,391)	(566,244)	(357,789)
Issuance of debt and collateralized borrowings, net of deferred issuance costs	(75)	298,419	524,396
Earnings distributions to limited partnership interests and other noncontrolling interests	(28,877)	(52,169)	(63,109)
Redemption and repurchase of limited partnership interests	(76,219)	(110,565)	(47,613)
Dividends to stockholders	(14,859)	(15,098)	(60,440)
Repurchase of Class A common stock	(103,888)	(365,398)	(6)
Proceeds from sale of Cantor Units in BGC Holdings	1,487	7,894	0
Pre-acquisition cash capital contribution to Futures Exchange Group	0	3,845	0
Acquisition of Futures Exchange Group	0	(9,022)	0
Payments on acquisition earn-outs	(4,384)	(11,199)	(8,540)
Net cash provided by (used in) financing activities	(233,206)	(819,537)	(13,101)
Effect of exchange rate changes on Cash and cash equivalents, and Cash segregated under regulatory requirements	(2,615)	(5,388)	993
Net increase (decrease) in cash and cash equivalents	(64,789)	(286,607)	212,568
Cash and cash equivalents, and Cash segregated under regulatory requirements at beginning of period	566,799	853,406	640,838
Cash and cash equivalents, and Cash segregated under regulatory requirements at end of period	502,010	566,799	853,406
Supplemental cash information:
Cash paid during the period for taxes	35,782	43,357	41,910
Cash paid during the period for interest	53,655	66,450	69,572
Supplemental non-cash information:
Issuance of Class A common stock upon exchange of limited partnership interests	34,889	157,547	11,388
Issuance Of Class Common Stock And Limited Partnership Interests For Acquisitions	2,710	1,160	1,578
ROU assets and liabilities	$ 44,123	$ 7,367	$ 34,456