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v3.25.2

Pension and Postretirement Plans (Narrative) (Details) - Defined Benefit Pension Plan [Member] $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2025 USD ($) investment company | Mar. 31, 2025 USD ($) | Jun. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Jun. 30, 2025 USD ($) investment company | Jun. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) investment
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Special separation benefit expense | $ 6,015 |  | $ 16,410 |  | $ 6,639 | $ 16,828 |
Percent of plan assets managed internally by the company |  |  |  |  | 41.00% |  |
Percent of plan assets managed by investment companies |  |  |  |  | 59.00% |  |
Number of investment companies actively managing plan assets | company | 2 |  |  |  | 2 |  |
Percentage of total plan assets | 100.00% |  |  |  | 100.00% |  | 100.00%
Markel Corporation [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Value of investments | $ 115,900 |  |  |  | $ 115,900 |  | $ 100,100
Berkshire Hathaway Common Stock [Member] | Investment Manager 2 [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined benefit plan, target allocation maximum percentage of assets, singular equity security, without prior approval by plan administrator |  |  |  |  | 20.00% |  |
Alphabet and Berkshire Hathaway Common Stock [Member] | Investment Manager 1 [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined benefit plan, target allocation maximum percentage of assets, singular equity security, without prior approval by plan administrator |  |  |  |  | 15.00% |  |
Foreign Investments [Member] | Maximum [Member] | Investment Manager 1 [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined benefit plan, target allocation percentage of assets | 50.00% |  |  |  | 50.00% |  |
Foreign Investments [Member] | Maximum [Member] | Investment Manager 2 [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined benefit plan, target allocation percentage of assets | 15.00% |  |  |  | 15.00% |  |
Private investment fund [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Percentage of total plan assets | 17.00% |  |  |  | 17.00% |  | 19.00%
Single Equity Concentration [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined benefit plan, target allocation maximum percentage of assets, singular equity security, without prior approval by plan administrator |  |  |  |  | 10.00% |  |
Value of investments | $ 1,215,700 |  |  |  | $ 1,215,700 |  | $ 1,178,500
Percentage of total plan assets | 37.00% |  |  |  | 37.00% |  | 40.00%
Single Equity Concentration [Member] | Equity Securities [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Number of investments the company's pension plan held which individually exceed 10% of total plan assets | investment | 1 |  |  |  | 1 |  | 1
Single Equity Concentration [Member] | Private investment fund [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Number of investments the company's pension plan held which individually exceed 10% of total plan assets | investment | 1 |  |  |  | 1 |  | 1
Concentration In Single Entity, Type Of Industry, Foreign Country Or Individual Fund [Member] | Defined Benefit Plan Assets Total [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Minimum percentage of plan assets considered as significant concentrations in pension plans |  |  |  |  | 10.00% |  | 10.00%
Framebridge [Member] | Separation Incentive Program [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Special separation benefit expense |  |  |  | $ 400 |  |  |
Graham Media Group and Corporate [Member] | VoluntaryRetirementIncentiveProgram [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Special separation benefit expense |  |  | 14,800 |  |  |  |
Framebridge and Code3 [Member] | Separation Incentive Program [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Special separation benefit expense |  |  | $ 1,600 |  |  |  |
World of Good Brands [Member] | Separation Incentive Program [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Special separation benefit expense |  | $ 600 |  |  |  |  |
Kaplan, Graham Media Group, WGB, Saatchi Art, Society6, Code3 and Decile [Member] | Separation Incentive Program [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Special separation benefit expense | $ 6,000 |  |  |  |  |  |

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