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Accumulated Other Comprehensive Income (Loss) (Reclassifications out of AOCI) (Details 3) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]                      
Income (loss) from discontinued operations, net of tax $ (2,308)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax $ 6,980us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax $ (375,189)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax $ (1,732)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax $ (106,335)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax $ 23,988us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax $ 1,772us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax $ 16,560us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax $ (372,249)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax $ (64,015)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax $ (80,895)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Other income (expense), net (387,346)us-gaap_OtherNonoperatingIncomeExpense (64,526)us-gaap_OtherNonoperatingIncomeExpense (268,114)us-gaap_OtherNonoperatingIncomeExpense (133,273)us-gaap_OtherNonoperatingIncomeExpense 14,920us-gaap_OtherNonoperatingIncomeExpense (8,110)us-gaap_OtherNonoperatingIncomeExpense 12,858us-gaap_OtherNonoperatingIncomeExpense 4,083us-gaap_OtherNonoperatingIncomeExpense (853,259)us-gaap_OtherNonoperatingIncomeExpense 23,751us-gaap_OtherNonoperatingIncomeExpense 5,456us-gaap_OtherNonoperatingIncomeExpense
Amortization of net prior service credit included in net income                 (407)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax (1,383)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax (1,859)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
Amortization of net actuarial (gain) loss included in net income                 (29,412)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax 3,096us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax 9,368us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
Interest expense 9,879us-gaap_InterestExpense 9,330us-gaap_InterestExpense 8,557us-gaap_InterestExpense 8,820us-gaap_InterestExpense 8,838us-gaap_InterestExpense 9,221us-gaap_InterestExpense 9,048us-gaap_InterestExpense 8,960us-gaap_InterestExpense 36,586us-gaap_InterestExpense 36,067us-gaap_InterestExpense 35,944us-gaap_InterestExpense
Income from continuing operations before income taxes (524,258)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (141,619)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (453,261)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (207,973)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (74,293)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (84,312)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (78,606)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (37,619)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (1,327,111)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (274,830)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (124,692)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax on unrealized gains on available-for-sale securities reclassified out of accumulated other comprehensive income                 106,110ghc_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForExchangeSaleOrWritedownOfSecuritiesTax (3,822)ghc_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForExchangeSaleOrWritedownOfSecuritiesTax (6,890)ghc_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForExchangeSaleOrWritedownOfSecuritiesTax
Provision for Income Taxes 191,900us-gaap_IncomeTaxExpenseBenefit 58,200us-gaap_IncomeTaxExpenseBenefit 78,600us-gaap_IncomeTaxExpenseBenefit 77,400us-gaap_IncomeTaxExpenseBenefit 24,100us-gaap_IncomeTaxExpenseBenefit 29,900us-gaap_IncomeTaxExpenseBenefit 31,700us-gaap_IncomeTaxExpenseBenefit 15,800us-gaap_IncomeTaxExpenseBenefit 406,100us-gaap_IncomeTaxExpenseBenefit 101,500us-gaap_IncomeTaxExpenseBenefit 73,400us-gaap_IncomeTaxExpenseBenefit
Income Net of Tax (332,358)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest (83,419)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest (374,661)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest (130,573)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest (50,193)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest (54,412)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest (46,906)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest (21,819)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest (921,011)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest (173,330)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest (51,292)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Reclassification out of Accumulated Other Comprehensive Income [Member]                      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]                      
Income Net of Tax                 (176,951)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
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= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
Foreign Currency Translation Adjustments [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]                      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]                      
Income (loss) from discontinued operations, net of tax                 (404)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
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Unrealized Gain (Losses) on Available- for- Sale Securities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]                      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]                      
Other income (expense), net                 (265,274)us-gaap_OtherNonoperatingIncomeExpense
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
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/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 17,226us-gaap_OtherNonoperatingIncomeExpense
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/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Income tax on unrealized gains on available-for-sale securities reclassified out of accumulated other comprehensive income                 106,110ghc_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForExchangeSaleOrWritedownOfSecuritiesTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 [1] (3,822)ghc_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForExchangeSaleOrWritedownOfSecuritiesTax
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= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 [1] (6,890)ghc_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForExchangeSaleOrWritedownOfSecuritiesTax
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= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 [1]
Provision for Income Taxes                 1,200us-gaap_IncomeTaxExpenseBenefit
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/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		    
Income Net of Tax                 (159,164)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
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= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 5,732us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
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= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 10,336us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
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Unrealized Gain (Losses) on Available- for- Sale Securities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Berkshire Exchange Transaction [Member]                      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]                      
Income tax on unrealized gains on available-for-sale securities reclassified out of accumulated other comprehensive income                 107,300ghc_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForExchangeSaleOrWritedownOfSecuritiesTax
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/ ghc_TransactionAxis
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Pension and Other Postretirement Plans [Member]                      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]                      
Amortization of net prior service credit included in net income                 (407)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 [2] (1,383)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
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= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 [2] (1,859)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
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= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 [2]
Amortization of net actuarial (gain) loss included in net income                 (29,412)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
/ us-gaap_StatementEquityComponentsAxis
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Pension and Other Postretirement Plans [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]                      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]                      
Income from continuing operations before income taxes                 (29,819)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
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Provision for Income Taxes                 11,928us-gaap_IncomeTaxExpenseBenefit
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Income Net of Tax                 (17,891)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
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Cash Flow Hedge [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]                      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]                      
Interest expense                 847us-gaap_InterestExpense
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Provision for Income Taxes                 (339)us-gaap_IncomeTaxExpenseBenefit
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Income Net of Tax                 $ 508us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
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[1] Benefits of $1.2 million were recorded in Provision for Income Taxes related to the realized loss for the year ended December 31, 2014. The remaining $107.3 million for the year relates to the reversal of income taxes previously recorded on the unrealized gain of the Company’s investment in Berkshire Hathaway Inc. marketable securities as part of the Berkshire exchange transaction, which qualified as a tax-free distribution under IRC Section 355 and 361 (see Note 7). The amounts for 2013 and 2012 were recorded in Provision for Income Taxes.
[2] These accumulated other comprehensive income components are included in the computation of net periodic pension and postretirement plan cost (see Note 14).