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Consolidated Statement of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified | Common Class A [Member] Common Stock [Member] Restricted Stock [Member] 2007 Incentive Plan [Member] | Common Class A [Member] Common Stock [Member] USD ($) | Common Class A [Member] Treasury Stock [Member] USD ($) | Common Stock [Member] Restricted Stock [Member] 2007 Incentive Plan [Member] | Common Stock [Member] Employee Stock Option [Member] 2007 Incentive Plan [Member] USD ($) | Common Stock [Member] 401(k) Plan [Member] USD ($) | Common Stock [Member] USD ($) | Retained Earnings [Member] USD ($) | Treasury Stock [Member] Restricted Stock [Member] 2007 Incentive Plan [Member] USD ($) | Treasury Stock [Member] USD ($) | Accumulated Other Comprehensive Income (Loss) [Member] USD ($) | Restricted Stock [Member] 2007 Incentive Plan [Member] USD ($) | Restricted Stock [Member] USD ($) | Employee Stock Option [Member] 2007 Incentive Plan [Member] USD ($) | 401(k) Plan [Member] USD ($) | Total USD ($)
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Balance at Dec. 31, 2011 |  | $ 15,321 us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ (22,398)us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  | $ 479,869 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ (293,322)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | $ (40,115)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ (16,402)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  |  | $ 122,953 us-gaap_StockholdersEquity
Balance (in Shares) at Dec. 31, 2011 |  | 7,331,574 us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (1,578,554)us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  | 56,057,070 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | (4,654,750)us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  |  |
Net income |  |  |  |  |  |  |  | 28,129 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |  |  |  |  | 28,129 us-gaap_NetIncomeLoss
Adjustment to pension liability, net of income tax |  |  |  |  |  |  |  |  |  |  | (3,768)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  |  | (3,768)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Preferred stock dividends (including accretion of original issuance costs) |  |  |  |  |  |  |  | (4,095)us-gaap_TemporaryEquityDividendsAdjustment / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |  |  |  |  | (4,095)us-gaap_TemporaryEquityDividendsAdjustment
Issuance of common stock: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  | 26 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_DefinedContributionPlanNameAxis = gtn_K401PlanMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | (188)us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis = gtn_IncentivePlan2007Member / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  | (188)us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis = gtn_IncentivePlan2007Member |  |  | 26 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_DefinedContributionPlanNameAxis = gtn_K401PlanMember | 26 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan
Issuance of common stock (in Shares) |  |  |  | 432,396 us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis = gtn_IncentivePlan2007Member / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 14,293 us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan / us-gaap_DefinedContributionPlanNameAxis = gtn_K401PlanMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | (84,712)us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis = gtn_IncentivePlan2007Member / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  |  |  | 14,293 us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan
Share-based compensation |  |  |  |  |  |  | 878 us-gaap_ShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  | 400 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  | 878 us-gaap_ShareBasedCompensation
Balance at Dec. 31, 2012 |  | 15,321 us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (22,398)us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  | 480,773 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (269,288)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (40,303)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (20,170)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  |  | 143,935 us-gaap_StockholdersEquity
Balance (in Shares) at Dec. 31, 2012 |  | 7,331,574 us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (1,578,554)us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  | 56,503,759 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | (4,739,462)us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  |  |
Net income |  |  |  |  |  |  |  | 18,288 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |  |  |  |  | 18,288 us-gaap_NetIncomeLoss
Adjustment to pension liability, net of income tax |  |  |  |  |  |  |  |  |  |  | 9,761 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  |  | 9,761 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Issuance of common stock: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  | 280 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis = gtn_IncentivePlan2007Member / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 28 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_DefinedContributionPlanNameAxis = gtn_K401PlanMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | (256)us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis = gtn_IncentivePlan2007Member / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  | (256)us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis = gtn_IncentivePlan2007Member |  | 280 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis = gtn_IncentivePlan2007Member | 28 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_DefinedContributionPlanNameAxis = gtn_K401PlanMember | 28 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan
Issuance of common stock (in Shares) |  |  |  | 382,062 us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis = gtn_IncentivePlan2007Member / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 119,822 us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis = gtn_IncentivePlan2007Member / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 5,235 us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan / us-gaap_DefinedContributionPlanNameAxis = gtn_K401PlanMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | (29,463)us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis = gtn_IncentivePlan2007Member / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  |  |  | 5,235 us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan
Share-based compensation |  |  |  |  |  |  | 1,974 us-gaap_ShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |  | 1,974 us-gaap_ShareBasedCompensation
Balance at Dec. 31, 2013 |  | 15,321 us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (22,398)us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  | 483,055 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (251,000)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (40,559)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (10,409)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  |  | 174,010 us-gaap_StockholdersEquity
Balance (in Shares) at Dec. 31, 2013 |  | 7,331,574 us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (1,578,554)us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  | 57,010,878 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | (4,768,925)us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  |  |
Net income |  |  |  |  |  |  |  | 48,061 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |  |  |  |  | 48,061 us-gaap_NetIncomeLoss
Adjustment to pension liability, net of income tax |  |  |  |  |  |  |  |  |  |  | (10,403)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  |  | (10,403)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Issuance of common stock: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  | 25 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_DefinedContributionPlanNameAxis = gtn_K401PlanMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | (513)us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis = gtn_IncentivePlan2007Member / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  | (513)us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis = gtn_IncentivePlan2007Member |  |  | 25 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_DefinedContributionPlanNameAxis = gtn_K401PlanMember | 25 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan
Issuance of common stock (in Shares) | 236,294 us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis = gtn_IncentivePlan2007Member / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 312,961 us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis = gtn_IncentivePlan2007Member / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 2,341 us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan / us-gaap_DefinedContributionPlanNameAxis = gtn_K401PlanMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | (45,791)us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis = gtn_IncentivePlan2007Member / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  |  |  | 2,341 us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan
Share-based compensation |  | 1,775 us-gaap_ShareBasedCompensation / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  | 3,237 us-gaap_ShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |  | 5,012 us-gaap_ShareBasedCompensation
Balance at Dec. 31, 2014 |  | $ 17,096 us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ (22,398)us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  | $ 486,317 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ (202,939)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | $ (41,072)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ (20,812)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  |  | $ 216,192 us-gaap_StockholdersEquity
Balance (in Shares) at Dec. 31, 2014 |  | 7,567,868 us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (1,578,554)us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  | 57,326,180 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | (4,814,716)us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  |  |

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