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Receivables (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Receivables, gross | $ 3,486,395 | $ 2,983,173
Allowance for credit losses | (31,089) | (22,117)
Receivables | 3,455,306 | 2,961,056
Insurance operation |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amounts receivable from agents, brokers and insureds | 2,625,214 | 2,176,295
Receivables, gross | 117,436 | 83,728
Markel Ventures [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Receivables, gross | 657,156 | 645,189
Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Receivables, gross | $ 86,589 | $ 77,961

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