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Products, Services and Other Revenues (Schedule Of Revenues From Contracts With Customers By Type) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disaggregation of Revenue [Line Items]      
Leasing revenues $ 188,904 $ 157,552 $ 99,994
Program services and other fronting 154,838 147,612 123,823
Equity method and other investments income (loss) (13,598) (15,120) 13,317
Disposition gains 16,923 225,828 0
Other 42,733 33,970 33,727
Total products revenues and services and other revenues 5,249,565 5,236,521 3,997,445
Markel Ventures [Member]      
Disaggregation of Revenue [Line Items]      
Leasing revenues 188,904 157,552 99,994
Program services and other fronting 0 0 0
Equity method and other investments income (loss) (1,744) 2,541 6,133
Disposition gains 0 0 0
Other 42,693 32,930 32,212
Total products revenues and services and other revenues 4,979,768 4,756,618 3,643,816
Other [Member]      
Disaggregation of Revenue [Line Items]      
Leasing revenues 0 0 0
Program services and other fronting 154,838 147,612 123,823
Equity method and other investments income (loss) (11,854) (17,661) 7,184
Disposition gains 16,923 225,828 0
Other 40 1,040 1,515
Total products revenues and services and other revenues 269,797 479,903 353,629
Revenue from Contract with Customer [Member]      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 4,859,765 4,686,679 3,726,584
Revenue from Contract with Customer [Member] | Products [Member]      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 2,487,054 2,379,399 1,668,448
Revenue from Contract with Customer [Member] | Services [Member]      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 2,273,202 2,228,071 1,971,879
Revenue from Contract with Customer [Member] | Investment management [Member]      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 99,509 79,209 86,257
Revenue from Contract with Customer [Member] | Markel Ventures [Member]      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 4,749,915 4,563,595 3,505,477
Revenue from Contract with Customer [Member] | Markel Ventures [Member] | Products [Member]      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 2,487,054 2,379,399 1,668,448
Revenue from Contract with Customer [Member] | Markel Ventures [Member] | Services [Member]      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 2,262,861 2,184,196 1,837,029
Revenue from Contract with Customer [Member] | Markel Ventures [Member] | Investment management [Member]      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 0 0 0
Revenue from Contract with Customer [Member] | Other [Member]      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 109,850 123,084 221,107
Revenue from Contract with Customer [Member] | Other [Member] | Products [Member]      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 0 0 0
Revenue from Contract with Customer [Member] | Other [Member] | Services [Member]      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 10,341 43,875 134,850
Revenue from Contract with Customer [Member] | Other [Member] | Investment management [Member]      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers $ 99,509 $ 79,209 $ 86,257