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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Impairment of goodwill and other long-lived assets | $ 0 | $ 26,287 | $ 0 | $ 26,287
Impairment of cost method investments | $ 12,679 | $ 338 | $ 12,679 | $ 744
Graham Holdings Company [Member] | GHC One and GHC Two [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Guaranteed Return |  |  | 8.00% |
Percentage of Distributions Available to Common Unit Holders |  |  | 80.00% |
Group of Senior Managers of GHG [Member] | GHC One and GHC Two [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Percentage of Distributions Available to Common Unit Holders |  |  | 20.00% |
Group of Senior Managers of GHG [Member] | GHC One and GHC Two [Member] | GHC One and GHC Two [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 5.00% |  | 5.00% |
Graham Holdings Company [Member] | GHC One and GHC Two [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Percentage of Contributed Capital |  |  | 95.00% |
Group of Senior Managers of GHG [Member] | GHC One and GHC Two [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Percentage of Contributed Capital |  |  | 5.00% |

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