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Related-Party Transactions - Alliance Agreement (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Related Party Transaction [Line Items]
Commission revenue	$ 157,688	$ 135,789	$ 433,390	$ 370,672
Markel | Alliance Agreement | Affiliated Entity
Related Party Transaction [Line Items]
Due to insurer	108,039		108,039		$ 75,922
Commission revenue	$ 105,461	$ 95,559	$ 305,105	$ 267,935
Markel | Alliance Agreement | Affiliated Entity | Due To Related Parties | Related Party Concentration Risk
Related Party Transaction [Line Items]
Percent of total			91.00%		95.00%
Markel | Alliance Agreement | Affiliated Entity | Revenue from Contract with Customer Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Percent of total	92.00%	94.00%	93.00%	95.00%

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