Goodwill - Schedule of Goodwill (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2026	Dec. 31, 2025
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 274,470
Goodwill, ending balance	277,880	$ 274,470
Investment Banking Advisory
Goodwill [Roll Forward]
Goodwill, beginning balance	274,470	59,887
Measurement Period Adjustment	4,527
Acquisition		209,622
Foreign Currency Translation and Remeasurement	(1,117)	4,961
Goodwill, ending balance	$ 277,880	$ 274,470