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Revenue from Contracts with Customers (Capitalized Contract Cost) (Details) - USD ($) $ in Thousands | 3 Months Ended |
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Mar. 31, 2023 | Dec. 31, 2022
Revenue from Contract with Customer [Abstract] |  |
Contract costs capitalized during the period | $ 16,068 |
Costs amortized during the period | (19,637) |
Change in capitalized contract cost, other | 541 |
Balance of costs to obtain a contract | $ 28,619 | $ 31,647

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- Definition Change in capitalized contract cost, other + References No definition available. + Details
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Namespace Prefix: | ghc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Capitalized contract costs associated with new contracts entered into during the period. + References No definition available. + Details
Name: | ghc_ContractCostsCapitalizedDuringthePeriod
Namespace Prefix: | ghc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126905575&loc=SL49131252-203054 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126905575&loc=SL49131252-203054 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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