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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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