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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%