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Related-Party Transactions - Schedule of Alliance Agreement (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Related Party Transaction [Line Items]
Commission and fee revenue	$ 677,634	$ 548,631	$ 464,273
Markel | Alliance Agreement | Affiliated Entity
Related Party Transaction [Line Items]
Commission and fee revenue	436,843	387,951	$ 340,534
Due to insurer	$ 88,888	$ 78,792
Markel | Alliance Agreement | Affiliated Entity | Revenue from Contract with Customer Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Percent of total	91.10%	93.10%	94.70%
Markel | Alliance Agreement | Affiliated Entity | Due To Related Parties | Related Party Concentration Risk
Related Party Transaction [Line Items]
Percent of total	93.60%	93.80%

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