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Variable Interest Entities (Details) (USD $)
In Millions, unless otherwise specified
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3 Months Ended |
0 Months Ended |
1 Months Ended |
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Mar. 31, 2015
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Aug. 30, 2011
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Oct. 03, 2012
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Dec. 11, 2012
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Mar. 31, 2015
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Dec. 31, 2014
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| Primary Beneficiary [Member] |
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| Variable Interest Entity [Line Items] |
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| Project fund |
$ 59.3us-gaap_VariableInterestEntityFinancialOrOtherSupportAmount
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
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| Tax credit percentage |
39.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
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| Percentage of recapture |
100.00%gncma_VariableInterestEntityPercentageofRecapture
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
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| Recapture period |
7 years
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| Assets |
140.9us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
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140.9us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
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140.9us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
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| Liabilities |
104.2us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
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104.2us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
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104.2us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
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| NMTC 1 [Member] | Primary Beneficiary [Member] |
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| Variable Interest Entity [Line Items] |
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| Project fund |
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58.3us-gaap_VariableInterestEntityFinancialOrOtherSupportAmount
/ us-gaap_TypeOfArrangementAxis
= gncma_NMTCOneMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
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| Interest rate percentage |
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1.00%gncma_VariableInterestEntityFinancialorOtherSupportInterestRatePercentage
/ us-gaap_TypeOfArrangementAxis
= gncma_NMTCOneMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
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| NMTC 1 [Member] | Minimum [Member] | Primary Beneficiary [Member] |
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| Variable Interest Entity [Line Items] |
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| Interest rate percentage |
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1.00%gncma_VariableInterestEntityFinancialorOtherSupportInterestRatePercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TypeOfArrangementAxis
= gncma_NMTCOneMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
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| NMTC 1 [Member] | Maximum [Member] | Primary Beneficiary [Member] |
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| Variable Interest Entity [Line Items] |
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| Interest rate percentage |
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3.96%gncma_VariableInterestEntityFinancialorOtherSupportInterestRatePercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TypeOfArrangementAxis
= gncma_NMTCOneMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
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| NMTC 2 [Member] | Primary Beneficiary [Member] |
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| Variable Interest Entity [Line Items] |
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| Project fund |
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37.7us-gaap_VariableInterestEntityFinancialOrOtherSupportAmount
/ us-gaap_TypeOfArrangementAxis
= gncma_NMTCTwoMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
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| Interest rate percentage |
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1.00%gncma_VariableInterestEntityFinancialorOtherSupportInterestRatePercentage
/ us-gaap_TypeOfArrangementAxis
= gncma_NMTCTwoMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
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| NMTC 2 [Member] | Minimum [Member] | Primary Beneficiary [Member] |
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| Variable Interest Entity [Line Items] |
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| Interest rate percentage |
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0.7099%gncma_VariableInterestEntityFinancialorOtherSupportInterestRatePercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TypeOfArrangementAxis
= gncma_NMTCTwoMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
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| NMTC 2 [Member] | Maximum [Member] | Primary Beneficiary [Member] |
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| Variable Interest Entity [Line Items] |
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| Interest rate percentage |
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0.7693%gncma_VariableInterestEntityFinancialorOtherSupportInterestRatePercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TypeOfArrangementAxis
= gncma_NMTCTwoMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
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| NMTC 3 [Member] | Primary Beneficiary [Member] |
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| Variable Interest Entity [Line Items] |
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| Project fund |
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8.2us-gaap_VariableInterestEntityFinancialOrOtherSupportAmount
/ us-gaap_TypeOfArrangementAxis
= gncma_NMTCThreeMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
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| Interest rate percentage |
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1.00%gncma_VariableInterestEntityFinancialorOtherSupportInterestRatePercentage
/ us-gaap_TypeOfArrangementAxis
= gncma_NMTCThreeMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
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| NMTC 3 [Member] | Maximum [Member] | Primary Beneficiary [Member] |
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| Variable Interest Entity [Line Items] |
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| Interest rate percentage |
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1.35%gncma_VariableInterestEntityFinancialorOtherSupportInterestRatePercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TypeOfArrangementAxis
= gncma_NMTCThreeMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
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| US Bancorp [Member] | NMTC 1 [Member] | Primary Beneficiary [Member] |
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| Variable Interest Entity [Line Items] |
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| Amount to other entity |
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22.4gncma_VariableInterestEntityFinancialorOtherSupportAmountToOtherEntity
/ us-gaap_LeaseArrangementTypeAxis
= gncma_USBancorpMember
/ us-gaap_TypeOfArrangementAxis
= gncma_NMTCOneMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
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| US Bancorp [Member] | NMTC 2 [Member] | Primary Beneficiary [Member] |
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| Variable Interest Entity [Line Items] |
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| Amount to other entity |
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17.5gncma_VariableInterestEntityFinancialorOtherSupportAmountToOtherEntity
/ us-gaap_LeaseArrangementTypeAxis
= gncma_USBancorpMember
/ us-gaap_TypeOfArrangementAxis
= gncma_NMTCTwoMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
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| US Bancorp [Member] | NMTC 3 [Member] | Primary Beneficiary [Member] |
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| Variable Interest Entity [Line Items] |
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| Amount to other entity |
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3.8gncma_VariableInterestEntityFinancialorOtherSupportAmountToOtherEntity
/ us-gaap_LeaseArrangementTypeAxis
= gncma_USBancorpMember
/ us-gaap_TypeOfArrangementAxis
= gncma_NMTCThreeMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
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| Community Development Entities [Member] | NMTC 1 [Member] | Primary Beneficiary [Member] |
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| Variable Interest Entity [Line Items] |
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| Amount to other entity |
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76.8gncma_VariableInterestEntityFinancialorOtherSupportAmountToOtherEntity
/ us-gaap_LeaseArrangementTypeAxis
= gncma_CommunityDevelopmentEntitiesMember
/ us-gaap_TypeOfArrangementAxis
= gncma_NMTCOneMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
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| Community Development Entities [Member] | NMTC 2 [Member] | Primary Beneficiary [Member] |
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| Variable Interest Entity [Line Items] |
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| Amount to other entity |
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55.2gncma_VariableInterestEntityFinancialorOtherSupportAmountToOtherEntity
/ us-gaap_LeaseArrangementTypeAxis
= gncma_CommunityDevelopmentEntitiesMember
/ us-gaap_TypeOfArrangementAxis
= gncma_NMTCTwoMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
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| Community Development Entities [Member] | NMTC 3 [Member] | Primary Beneficiary [Member] |
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| Variable Interest Entity [Line Items] |
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| Amount to other entity |
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12.0gncma_VariableInterestEntityFinancialorOtherSupportAmountToOtherEntity
/ us-gaap_LeaseArrangementTypeAxis
= gncma_CommunityDevelopmentEntitiesMember
/ us-gaap_TypeOfArrangementAxis
= gncma_NMTCThreeMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
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| Next Generation Carrier-Class Communications Services Firm [Member] |
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| Variable Interest Entity [Line Items] |
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| Ownership percentage |
40.80%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= gncma_NextGenerationCarrierClassCommunicationsServicesFirmMember
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40.80%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= gncma_NextGenerationCarrierClassCommunicationsServicesFirmMember
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| Next Generation Carrier-Class Communications Services Firm [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |
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| Variable Interest Entity [Line Items] |
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| Project fund |
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3.0us-gaap_VariableInterestEntityFinancialOrOtherSupportAmount
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= gncma_NextGenerationCarrierClassCommunicationsServicesFirmMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
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| Other Current Assets [Member] | Next Generation Carrier-Class Communications Services Firm [Member] |
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| Variable Interest Entity [Line Items] |
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| Cost method Investment |
13.1us-gaap_EquityMethodInvestments
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= gncma_NextGenerationCarrierClassCommunicationsServicesFirmMember
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13.1us-gaap_EquityMethodInvestments
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= gncma_NextGenerationCarrierClassCommunicationsServicesFirmMember
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| Notes receivable |
$ 3.0us-gaap_NotesReceivableRelatedPartiesCurrent
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= gncma_NextGenerationCarrierClassCommunicationsServicesFirmMember
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$ 3.0us-gaap_NotesReceivableRelatedPartiesCurrent
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= gncma_NextGenerationCarrierClassCommunicationsServicesFirmMember
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