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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

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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