CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Revenues:
Commissions	$ 599,496	$ 395,081	$ 1,094,207	$ 810,253
Principal transactions	120,403	98,439	236,481	211,288
Fees from related parties	5,241	4,643	9,663	9,064
Data, network and post-trade	35,462	30,812	67,962	61,715
Interest and dividend income	15,268	17,145	26,897	26,909
Other revenues	8,134	4,641	13,034	10,146
Total revenues	784,004	550,761	1,448,244	1,129,375
Expenses:
Compensation and employee benefits	416,463	271,990	758,111	562,832
Equity-based compensation and allocations of net income to limited partnership units and FPUs	83,926	66,207	159,249	162,288
Total compensation and employee benefits	500,389	338,197	917,360	725,120
Occupancy and equipment	46,478	40,959	89,047	81,765
Fees to related parties	10,409	8,009	18,759	15,224
Professional and consulting fees	15,796	12,805	31,465	27,064
Communications	34,659	30,172	65,288	60,180
Selling and promotion	28,810	17,714	48,251	34,485
Commissions and floor brokerage	16,690	17,414	34,182	34,806
Interest expense	33,801	21,551	58,455	41,687
Other expenses	24,654	13,334	35,401	27,892
Total expenses	711,686	500,155	1,298,208	1,048,223
Other income (losses), net:
Gains (losses) on equity method investments	2,379	2,744	4,737	4,534
Other income (loss)	581	1,814	483	40,576
Total other income (losses), net	2,960	4,558	5,220	45,110
Income (loss) from operations before income taxes	75,278	55,164	155,256	126,262
Provision (benefit) for income taxes	19,063	17,989	45,612	40,046
Consolidated net income (loss)	56,215	37,175	109,644	86,216
Less: Net income (loss) attributable to noncontrolling interest in subsidiaries	(1,330)	(653)	(3,065)	(822)
Net income (loss) available to common stockholders	57,545	37,828	112,709	87,038
Basic earnings (loss) per share
Net income (loss) attributable to common stockholders	$ 55,117	$ 36,054	$ 107,905	$ 82,502
Basic earnings (loss) per share (in dollars per share)	$ 0.11	$ 0.08	$ 0.22	$ 0.17
Basic weighted-average shares of common stock outstanding (in shares)	480,138	475,272	479,655	472,895
Fully diluted earnings (loss) per share
Net income (loss) for fully diluted shares	$ 55,136	$ 36,070	$ 107,950	$ 82,553
Fully diluted earnings (loss) per share (in dollars per share)	$ 0.11	$ 0.08	$ 0.22	$ 0.17
Fully diluted weighted-average shares of common stock outstanding (in shares)	484,636	480,861	485,090	479,417