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Segment Reporting Disclosures (Summary of Additional Measures for Markel Ventures) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Interest expense $ 185,077 $ 196,062 $ 183,579
Income tax (expense) benefit 552,616 (48,209) 683,961
Markel Ventures [Member]      
Segment Reporting Information [Line Items]      
Depreciation 108,605 102,055 72,580
Interest expense [1] 47,227 46,780 35,031
Income tax (expense) benefit 85,295 61,588 43,626
Capital expenditure 221,036 225,230 124,451
Intercompany interest expense [1] $ 26,500 $ 27,400 $ 25,800
[1] Interest expense for the years ended December 31, 2023, 2022 and 2021 included intercompany interest expense of $26.5 million, $27.4 million and $25.8 million, respectively, which was eliminated in consolidation.