Subsequent Events (Details) (Subsequent Event [Member], USD $)
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0 Months Ended |
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Feb. 02, 2015
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ACS Wireless [Member] | |
Subsequent Event [Line Items] | |
Cash consideration paid |
$ 293,200,000us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = gncma_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 = gncma_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) | |
Subsequent Event [Line Items] | |
Basis spread on variable rate |
3.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = gncma_CreditAgricoleFourthAmendedandRestatedCreditandGuaranteeAgreementMember / us-gaap_LongtermDebtTypeAxis = us-gaap_MediumTermNotesMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |
Variable rate floor |
1.00%gncma_DebtInstrumentVariableRateFloor / us-gaap_DebtInstrumentAxis = gncma_CreditAgricoleFourthAmendedandRestatedCreditandGuaranteeAgreementMember / us-gaap_LongtermDebtTypeAxis = us-gaap_MediumTermNotesMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |
Unsecured Debt [Member] | Searchlight ALX, LP Promissory Note [Member] | |
Subsequent Event [Line Items] | |
Debt Instrument, face Amount |
$ 75,000,000.0us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = gncma_SearchlightALXLPPromissoryNoteMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Stated percentage |
7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = gncma_SearchlightALXLPPromissoryNoteMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Class A Common Stock | Stock Appreciation Rights (SARs) [Member] | |
Subsequent Event [Line Items] | |
Rights outstanding |
3,000,000us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_StockAppreciationRightsSARSMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Exercise price of rights |
$ 13.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_StockAppreciationRightsSARSMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
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Debt Instrument, Variable Rate Floor No definition available.
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Exercise price per share or per unit of warrants or rights outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Number of warrants or rights outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Percentage points added to the reference rate to compute the variable rate on the debt instrument. No definition available.
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Face (par) amount of debt instrument at time of issuance. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Contractual interest rate for funds borrowed, under the debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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