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Income Taxes - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 28, 2014
Dec. 29, 2013
Dec. 30, 2012
Income Taxes [Line Items]      
Effective income tax rate absent of adjustments 30.90%gci_EffectiveIncomeTaxRateExcludingPeriodSpecificItems 29.70%gci_EffectiveIncomeTaxRateExcludingPeriodSpecificItems 30.90%gci_EffectiveIncomeTaxRateExcludingPeriodSpecificItems
Capital loss carryforwards $ 728,800,000us-gaap_DeferredTaxAssetsCapitalLossCarryforwards    
Deferred tax assets valuation allowance 200,123,000us-gaap_DeferredTaxAssetsValuationAllowance 83,579,000us-gaap_DeferredTaxAssetsValuationAllowance  
Valuation allowance for capital loss carryforwards 96,300,000us-gaap_OperatingLossCarryforwardsValuationAllowance    
Unrecognized tax benefits that, if recognized, would impact effective tax rate 46,800,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 46,500,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate  
Recognized income (expense) from interest and the release of penalty reserves 4,600,000us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense 17,200,000us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense 7,800,000us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense
Accrued interest and penalties payable related to unrecognized tax benefits 6,900,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 11,500,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued  
Estimated decrease in gross unrecognized tax positions within the next 12 months, maximum 4,800,000us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit    
Foreign      
Income Taxes [Line Items]      
Capital loss carryforwards 35,300,000us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
   
Tax credit carryforward 16,800,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
   
Net operating loss carryforwards 278,400,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
   
State and Local      
Income Taxes [Line Items]      
Tax credit carryforward 1,800,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
   
Net operating loss carryforwards $ 489,000,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
   
Federal      
Income Taxes [Line Items]      
Tax years subject to examination The 2011 through 2014 tax years remain subject to examination by the IRS    
State      
Income Taxes [Line Items]      
Tax years subject to examination The 2010 through 2014 tax years generally remain subject to examination by state authorities    
United Kingdom      
Income Taxes [Line Items]      
Tax years subject to examination the tax year 2014 is subject to examination in the U.K.