Segments - Schedule of Depreciation and Amortization Expense by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Segment Reporting [Line Items]
Depreciation and amortization	$ 19,483	$ 2,405	$ 57,972	$ 23,961
Investment Banking Advisory
Segment Reporting [Line Items]
Depreciation and amortization	18,789	1,770	55,946	22,059
Valuations and Opinions
Segment Reporting [Line Items]
Depreciation and amortization	$ 694	$ 635	$ 2,026	$ 1,902