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Segment Reporting Disclosures (Summary of Additional Measures for Markel Ventures) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Segment Reporting Information [Line Items]        
Interest expense $ 44,553 $ 47,348 $ 141,212 $ 147,090
Income tax expense 14,235 16,460 339,903 (240,629)
Markel Ventures [Member]        
Segment Reporting Information [Line Items]        
Depreciation expense 26,857 23,738 81,639 75,304
Interest expense [1] 10,663 11,921 36,485 34,124
Income tax expense 22,253 12,603 66,022 43,682
Capital expenditures 65,616 48,294 135,159 144,974
Markel Ventures [Member] | Intercompany interest expense        
Segment Reporting Information [Line Items]        
Interest expense [1] $ 6,600 $ 6,600 $ 19,900 $ 20,700
[1] Interest expense for the quarter and nine months ended September 30, 2023 included intercompany interest expense of $6.6 million and $19.9 million, respectively. Interest expense for the quarter and nine months ended September 30, 2022 included intercompany interest expense of $6.6 million and $20.7 million, respectively. Intercompany interest expense was eliminated in consolidation.