CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues:
Commissions	$ 1,648,817	$ 1,464,524	$ 1,281,294
Principal transactions	389,429	368,100	365,507
Fees from related parties	20,728	15,968	14,734
Data, network and post-trade	126,963	111,470	96,389
Interest and dividend income	56,223	45,422	21,007
Other revenues	20,658	19,917	16,371
Total revenues	2,262,818	2,025,401	1,795,302
Expenses:
Compensation and employee benefits	1,123,747	992,603	853,165
Equity-based compensation and allocations of net income to limited partnership units and FPUs	369,143	355,378	251,071
Total compensation and employee benefits	1,492,890	1,347,981	1,104,236
Occupancy and equipment	169,238	162,743	157,491
Fees to related parties	32,529	32,649	25,662
Professional and consulting fees	64,949	60,398	68,775
Communications	120,624	114,143	108,096
Selling and promotion	70,466	61,884	49,215
Commissions and floor brokerage	70,798	61,523	58,277
Interest expense	91,075	77,231	57,932
Other expenses	69,694	74,278	87,431
Total expenses	2,182,263	1,992,830	1,717,115
Other income (losses), net:
Gains (losses) on divestitures and sale of investments	38,769	0	(1,029)
Gains (losses) on equity method investments	8,430	9,152	10,920
Other income (loss)	45,389	15,986	9,373
Total other income (losses), net	92,588	25,138	19,264
Income (loss) from operations before income taxes	173,143	57,709	97,451
Provision (benefit) for income taxes	49,915	18,934	38,584
Consolidated net income (loss)	123,228	38,775	58,867
Less: Net income (loss) attributable to noncontrolling interest in subsidiaries	(3,760)	2,510	10,155
Net income (loss) available to common stockholders	126,988	36,265	48,712
Basic earnings (loss) per share
Net income (loss) attributable to common stockholders	$ 121,215	$ 34,070	$ 48,712
Basic earnings (loss) per share (in dollars per share)	$ 0.26	$ 0.08	$ 0.13
Basic weighted-average shares of common stock outstanding (in shares)	473,390	426,436	371,561
Fully diluted earnings (loss) per share
Net income (loss) for fully diluted shares	$ 121,268	$ 33,943	$ 63,479
Fully diluted earnings (loss) per share (in dollars per share)	$ 0.25	$ 0.07	$ 0.13
Fully diluted weighted-average shares of common stock outstanding (in shares)	479,142	489,989	499,414