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Long Term Debt (Schedule of Redemption Prices) (Details) (Line of Credit [Member])
 12 Months Ended
Dec. 31, 2014
2021 Notes [Member] | Redemption period one  
Debt Instrument [Line Items]  
Redemption price, percentage 103.375%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= gciinc_SeniorNotesDueTwentyTwentyOneMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
2021 Notes [Member] | Redemption period two  
Debt Instrument [Line Items]  
Redemption price, percentage 102.25%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= gciinc_SeniorNotesDueTwentyTwentyOneMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodTwoMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
2021 Notes [Member] | Redemption period three  
Debt Instrument [Line Items]  
Redemption price, percentage 101.125%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= gciinc_SeniorNotesDueTwentyTwentyOneMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodThreeMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
2021 Notes [Member] | Redemption period four  
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= gciinc_SeniorNotesDueTwentyTwentyOneMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodFourMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
2019 Notes [Member] | Redemption period one  
Debt Instrument [Line Items]  
Redemption price, percentage 104.313%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= gciinc_SeniorNotesDueTwentyNineteenMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
2019 Notes [Member] | Redemption period two  
Debt Instrument [Line Items]  
Redemption price, percentage 103.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= gciinc_SeniorNotesDueTwentyNineteenMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodTwoMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
2019 Notes [Member] | Redemption period three  
Debt Instrument [Line Items]  
Redemption price, percentage 101.438%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= gciinc_SeniorNotesDueTwentyNineteenMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodThreeMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
2019 Notes [Member] | Redemption period four  
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= gciinc_SeniorNotesDueTwentyNineteenMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodFourMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember