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Intangible Assets, Net and Goodwill - Schedule of Goodwill (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025
Goodwill [Roll Forward]
Balance at December 31, 2025	$ 1,517,171
Goodwill of acquired businesses	1,134,895
Measurement period adjustments	341	$ 0
Balance at June 30, 2026	2,652,407
Insurance Advisory Solutions
Goodwill [Roll Forward]
Balance at December 31, 2025	932,487
Goodwill of acquired businesses	940,290
Measurement period adjustments	0
Balance at June 30, 2026	1,872,777
Underwriting, Capacity & Technology Solutions
Goodwill [Roll Forward]
Balance at December 31, 2025	241,905
Goodwill of acquired businesses	194,605
Measurement period adjustments	341
Balance at June 30, 2026	436,851
Mainstreet Insurance Solutions Segment
Goodwill [Roll Forward]
Balance at December 31, 2025	342,779
Goodwill of acquired businesses	0
Measurement period adjustments	0
Balance at June 30, 2026	$ 342,779

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