Variable Interest Entities (Details) (Primary Beneficiary, USD $) In Millions, unless otherwise specified
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12 Months Ended |
0 Months Ended |
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Dec. 31, 2014
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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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Dec. 31, 2013
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Variable Interest Entity [Line Items] |
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Financial support |
$ 59.3us-gaap_VariableInterestEntityFinancialOrOtherSupportAmount
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Tax credit percentage |
39.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment
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Restricted cash |
1.1us-gaap_RestrictedCashAndCashEquivalents
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6.9us-gaap_RestrictedCashAndCashEquivalents
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Percentage of recapture |
100.00%gncma_VariableInterestEntityPercentageofRecapture
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Recapture period |
7 years
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Assets |
140.9us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
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140.9us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
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Liabilities |
104.2us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities
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104.2us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities
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NMTC 1 |
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Variable Interest Entity [Line Items] |
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Financial support |
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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 percent on financial support |
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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 | Minimum |
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Variable Interest Entity [Line Items] |
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Interest rate percent on financial support |
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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 | Maximum |
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Variable Interest Entity [Line Items] |
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Interest rate percent on financial support |
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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 1 | US Bancorp |
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Variable Interest Entity [Line Items] |
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Financial support 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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NMTC 1 | CDE's |
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Variable Interest Entity [Line Items] |
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Financial support 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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NMTC 2 |
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Variable Interest Entity [Line Items] |
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Financial support |
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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 percent on financial support |
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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 | Minimum |
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Variable Interest Entity [Line Items] |
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Interest rate percent on financial support |
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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 | Maximum |
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Variable Interest Entity [Line Items] |
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Interest rate percent on financial support |
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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 2 | US Bancorp |
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Variable Interest Entity [Line Items] |
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Financial support 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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NMTC 2 | CDE's |
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Variable Interest Entity [Line Items] |
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Financial support 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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NMTC 3 |
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Variable Interest Entity [Line Items] |
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Financial support |
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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 percent on financial support |
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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 | Maximum |
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Variable Interest Entity [Line Items] |
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Interest rate percent on financial support |
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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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NMTC 3 | US Bancorp |
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Variable Interest Entity [Line Items] |
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Financial support 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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NMTC 3 | CDE's |
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Variable Interest Entity [Line Items] |
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Financial support 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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