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v3.24.3

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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