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Products, Services and Other Revenues (Schedule Of Revenues From Contracts With Customers By Type) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Disaggregation of Revenue [Line Items]        
Other revenues $ 764,983 $ 702,171 $ 1,363,138 $ 1,244,309
Revenue from contracts with customers [Member]        
Disaggregation of Revenue [Line Items]        
Other revenues 716,867 645,094 1,259,077 1,131,872
Products [Member] | Revenue from contracts with customers [Member]        
Disaggregation of Revenue [Line Items]        
Other revenues 414,516 486,209 752,754 819,703
Services [Member] | Revenue from contracts with customers [Member]        
Disaggregation of Revenue [Line Items]        
Other revenues 277,342 128,789 451,491 241,181
Investment management [Member] | Revenue from contracts with customers [Member]        
Disaggregation of Revenue [Line Items]        
Other revenues 25,009 30,096 54,832 70,988
Program services and other fronting [Member]        
Disaggregation of Revenue [Line Items]        
Other revenues 24,790 27,861 50,494 54,178
Other [Member]        
Disaggregation of Revenue [Line Items]        
Other revenues 23,326 29,216 53,567 58,259
Markel Ventures [Member]        
Disaggregation of Revenue [Line Items]        
Other revenues 678,085 616,987 1,189,122 1,071,750
Markel Ventures [Member] | Revenue from contracts with customers [Member]        
Disaggregation of Revenue [Line Items]        
Other revenues 654,736 588,117 1,136,238 1,014,258
Markel Ventures [Member] | Products [Member] | Revenue from contracts with customers [Member]        
Disaggregation of Revenue [Line Items]        
Other revenues 414,516 486,209 752,754 819,703
Markel Ventures [Member] | Services [Member] | Revenue from contracts with customers [Member]        
Disaggregation of Revenue [Line Items]        
Other revenues 240,220 101,908 383,484 194,555
Markel Ventures [Member] | Investment management [Member] | Revenue from contracts with customers [Member]        
Disaggregation of Revenue [Line Items]        
Other revenues 0 0 0 0
Markel Ventures [Member] | Program services and other fronting [Member]        
Disaggregation of Revenue [Line Items]        
Other revenues 0 0 0 0
Markel Ventures [Member] | Other [Member]        
Disaggregation of Revenue [Line Items]        
Other revenues 23,349 28,870 52,884 57,492
Other [Member]        
Disaggregation of Revenue [Line Items]        
Other revenues 86,898 85,184 174,016 172,559
Other [Member] | Revenue from contracts with customers [Member]        
Disaggregation of Revenue [Line Items]        
Other revenues 62,131 56,977 122,839 117,614
Other [Member] | Products [Member] | Revenue from contracts with customers [Member]        
Disaggregation of Revenue [Line Items]        
Other revenues 0 0 0 0
Other [Member] | Services [Member] | Revenue from contracts with customers [Member]        
Disaggregation of Revenue [Line Items]        
Other revenues 37,122 26,881 68,007 46,626
Other [Member] | Investment management [Member] | Revenue from contracts with customers [Member]        
Disaggregation of Revenue [Line Items]        
Other revenues 25,009 30,096 54,832 70,988
Other [Member] | Program services and other fronting [Member]        
Disaggregation of Revenue [Line Items]        
Other revenues 24,790 27,861 50,494 54,178
Other [Member] | Other [Member]        
Disaggregation of Revenue [Line Items]        
Other revenues $ (23) $ 346 $ 683 $ 767