Segments - Schedule of Financial Information by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Segment Reporting [Line Items]
Revenues	$ 225,693	$ 149,658	$ 383,493	$ 281,866
Compensation and benefits	145,782	70,798	241,879	141,127
Non-compensation expenses	95,791	46,717	151,547	85,685
Total operating income (loss)	(15,880)	32,143	(9,933)	55,054
Other income (expense), net	(5,549)	1,727	(9,508)	3,609
Income (loss) before income taxes	(21,429)	33,870	(19,441)	58,663
Investment Banking Advisory
Segment Reporting [Line Items]
Revenues	177,746	114,152	287,591	207,718
Compensation and benefits	111,807	60,292	190,313	118,289
Non-compensation expenses	80,330	35,292	123,967	65,678
Total operating income (loss)	(14,391)	18,568	(26,689)	23,751
Valuations and Opinions
Segment Reporting [Line Items]
Revenues	47,947	35,506	95,902	74,148
Compensation and benefits	33,975	10,506	51,566	22,838
Non-compensation expenses	15,461	11,425	27,580	20,007
Total operating income (loss)	$ (1,489)	$ 13,575	$ 16,756	$ 31,303