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Subsequent Events (Details) (Subsequent Event [Member], USD $)
 0 Months Ended
Feb. 02, 2015
ACS Wireless [Member]  
Subsequent Event [Line Items]  
Cash consideration paid $ 293,200,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= gciinc_ACSWirelessMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Medium-term Notes [Member] | Credit Agricole Fourth Amended and Restated Credit and Guarantee Agreement [Member]  
Subsequent Event [Line Items]  
Debt Instrument, face amount $ 275,000,000.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= gciinc_CreditAgricoleFourthAmendedandRestatedCreditandGuaranteeAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MediumTermNotesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Medium-term Notes [Member] | Credit Agricole Fourth Amended and Restated Credit and Guarantee Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]  
Subsequent Event [Line Items]  
Basis spread on variable rate 3.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= gciinc_CreditAgricoleFourthAmendedandRestatedCreditandGuaranteeAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MediumTermNotesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
Variable rate floor 1.00%gciinc_DebtInstrumentVariableRateFloor
/ us-gaap_DebtInstrumentAxis
= gciinc_CreditAgricoleFourthAmendedandRestatedCreditandGuaranteeAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MediumTermNotesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember