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Note 3 - Long-term Debt (Details) (USD $)
 12 Months Ended 9 Months Ended 0 Months Ended 3 Months Ended 7 Months Ended 1 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2015
Sep. 15, 2014
Jun. 13, 2014
Sep. 15, 2014
Dec. 31, 2014
Dec. 31, 2014
Dec. 15, 2014
Jul. 31, 2013
Note 3 - Long-term Debt (Details) [Line Items]                      
Long-term Debt $ 1,200,000,000us-gaap_LongTermDebt $ 842,900,000us-gaap_LongTermDebt           1,200,000,000us-gaap_LongTermDebt $ 1,200,000,000us-gaap_LongTermDebt    
Proceeds from Issuance of Long-term Debt 644,000,000us-gaap_ProceedsFromIssuanceOfLongTermDebt 390,926,000us-gaap_ProceedsFromIssuanceOfLongTermDebt 855,798,000us-gaap_ProceedsFromIssuanceOfLongTermDebt                
Repayments of Long-term Debt 249,623,000us-gaap_RepaymentsOfLongTermDebt 381,003,000us-gaap_RepaymentsOfLongTermDebt 856,292,000us-gaap_RepaymentsOfLongTermDebt                
Gains (Losses) on Extinguishment of Debt (5,086,000)us-gaap_GainsLossesOnExtinguishmentOfDebt   (46,683,000)us-gaap_GainsLossesOnExtinguishmentOfDebt                
Interest Paid 61,900,000us-gaap_InterestPaid 49,400,000us-gaap_InterestPaid 53,300,000us-gaap_InterestPaid                
Interest Costs Capitalized 0us-gaap_InterestCostsCapitalized 0us-gaap_InterestCostsCapitalized 0us-gaap_InterestCostsCapitalized                
Certain Equity Offerings [Member] | Scenario, Forecast [Member] | 2020 Notes [Member] | Maximum [Member]                      
Note 3 - Long-term Debt (Details) [Line Items]                      
Debt Instrument, Redemption Price, Percentage       35.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= gtn_Notes2020Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementEquityComponentsAxis
= gtn_CertainEquityOfferingsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		              
Amended [Member] | 2014 Term Loan [Member]                      
Note 3 - Long-term Debt (Details) [Line Items]                      
Line of Credit Facility, Maximum Borrowing Capacity         625,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= gtn_The2014TermLoanMember
/ us-gaap_StatementScenarioAxis
= gtn_AmendedMember		   625,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= gtn_The2014TermLoanMember
/ us-gaap_StatementScenarioAxis
= gtn_AmendedMember		        
Amended [Member] | 2014 Senior Credit Facility [Member]                      
Note 3 - Long-term Debt (Details) [Line Items]                      
Debt Issuance Cost         2,100,000us-gaap_DebtIssuanceCosts
/ us-gaap_CreditFacilityAxis
= gtn_The2014SeniorCreditFacilityMember
/ us-gaap_StatementScenarioAxis
= gtn_AmendedMember		            
Additional Borrowing [Member] | 2014 Term Loan [Member]                      
Note 3 - Long-term Debt (Details) [Line Items]                      
Proceeds from Lines of Credit         100,000,000us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_CreditFacilityAxis
= gtn_The2014TermLoanMember
/ us-gaap_StatementScenarioAxis
= gtn_AdditionalBorrowingMember		            
Scenario, Forecast [Member] | 2020 Notes [Member]                      
Note 3 - Long-term Debt (Details) [Line Items]                      
Debt Instrument, Redemption Price, Percentage       100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= gtn_Notes2020Member
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		              
2014 Senior Credit Facility [Member]                      
Note 3 - Long-term Debt (Details) [Line Items]                      
Line of Credit Facility, Maximum Borrowing Capacity           575,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= gtn_The2014SeniorCreditFacilityMember		          
Long-term Line of Credit 556,438,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= gtn_The2014SeniorCreditFacilityMember		             556,438,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= gtn_The2014SeniorCreditFacilityMember		 556,438,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= gtn_The2014SeniorCreditFacilityMember		    
Line of Credit Facility, Remaining Borrowing Capacity 50,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= gtn_The2014SeniorCreditFacilityMember		             50,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= gtn_The2014SeniorCreditFacilityMember		 50,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= gtn_The2014SeniorCreditFacilityMember		    
Deferred Finance Costs, Net 7,400,000us-gaap_DeferredFinanceCostsNet
/ us-gaap_DebtInstrumentAxis
= gtn_The2014SeniorCreditFacilityMember		             7,400,000us-gaap_DeferredFinanceCostsNet
/ us-gaap_DebtInstrumentAxis
= gtn_The2014SeniorCreditFacilityMember		 7,400,000us-gaap_DeferredFinanceCostsNet
/ us-gaap_DebtInstrumentAxis
= gtn_The2014SeniorCreditFacilityMember		    
Debt Issuance Cost           7,100,000us-gaap_DebtIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= gtn_The2014SeniorCreditFacilityMember		          
2014 Term Loan [Member] | Base Rate [Member] | Minimum [Member]                      
Note 3 - Long-term Debt (Details) [Line Items]                      
Debt Instrument, Basis Spread on Variable Rate             1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= gtn_The2014TermLoanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember		        
2014 Term Loan [Member] | Base Rate [Member] | Maximum [Member]                      
Note 3 - Long-term Debt (Details) [Line Items]                      
Debt Instrument, Basis Spread on Variable Rate               2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= gtn_The2014TermLoanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember		      
2014 Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]                      
Note 3 - Long-term Debt (Details) [Line Items]                      
Debt Instrument, Basis Spread on Variable Rate               2.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= gtn_The2014TermLoanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		      
2014 Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]                      
Note 3 - Long-term Debt (Details) [Line Items]                      
Debt Instrument, Basis Spread on Variable Rate               3.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= gtn_The2014TermLoanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		      
2014 Term Loan [Member] | Minimum LIBOR Floor [Member]                      
Note 3 - Long-term Debt (Details) [Line Items]                      
Debt Instrument, Basis Spread on Variable Rate               0.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= gtn_The2014TermLoanMember
/ us-gaap_VariableRateAxis
= gtn_MinimumLIBORFloorMember		      
2014 Term Loan [Member]                      
Note 3 - Long-term Debt (Details) [Line Items]                      
Long-term Debt           525,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= gtn_The2014TermLoanMember		          
Proceeds from Issuance of Long-term Debt           525,000,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= gtn_The2014TermLoanMember		          
Debt Instrument, Periodic Principal Payment, Principal               0.25%gtn_DebtInstrumentPeriodicPrincipalPaymentPrincipal
/ us-gaap_DebtInstrumentAxis
= gtn_The2014TermLoanMember		      
Repayments of Long-term Debt                 67,000,000us-gaap_RepaymentsOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= gtn_The2014TermLoanMember		    
2014 Revolving Credit Facility [Member] | Base Rate [Member] | Minimum [Member]                      
Note 3 - Long-term Debt (Details) [Line Items]                      
Debt Instrument, Basis Spread on Variable Rate               1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= gtn_The2014RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember		      
2014 Revolving Credit Facility [Member] | Base Rate [Member] | Maximum [Member]                      
Note 3 - Long-term Debt (Details) [Line Items]                      
Debt Instrument, Basis Spread on Variable Rate               1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= gtn_The2014RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember		      
2014 Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]                      
Note 3 - Long-term Debt (Details) [Line Items]                      
Debt Instrument, Basis Spread on Variable Rate               2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= gtn_The2014RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		      
2014 Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]                      
Note 3 - Long-term Debt (Details) [Line Items]                      
Debt Instrument, Basis Spread on Variable Rate               2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= gtn_The2014RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		      
2014 Revolving Credit Facility [Member] | Plus Overnight Federal Funds Rate [Member]                      
Note 3 - Long-term Debt (Details) [Line Items]                      
Debt Instrument, Basis Spread on Variable Rate               0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= gtn_The2014RevolvingCreditFacilityMember
/ us-gaap_VariableRateAxis
= gtn_PlusOvernightFederalFundsRateMember		      
2014 Revolving Credit Facility [Member] | Plus One-Month LIBOR [Member]                      
Note 3 - Long-term Debt (Details) [Line Items]                      
Debt Instrument, Basis Spread on Variable Rate               1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= gtn_The2014RevolvingCreditFacilityMember
/ us-gaap_VariableRateAxis
= gtn_PlusOneMonthLIBORMember		      
2014 Revolving Credit Facility [Member] | Minimum [Member]                      
Note 3 - Long-term Debt (Details) [Line Items]                      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage               0.375%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_DebtInstrumentAxis
= gtn_The2014RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		      
2014 Revolving Credit Facility [Member] | Maximum [Member]                      
Note 3 - Long-term Debt (Details) [Line Items]                      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage               0.50%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_DebtInstrumentAxis
= gtn_The2014RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		      
2014 Revolving Credit Facility [Member]                      
Note 3 - Long-term Debt (Details) [Line Items]                      
Line of Credit Facility, Maximum Borrowing Capacity           50,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= gtn_The2014RevolvingCreditFacilityMember		          
Long-term Line of Credit 556,400,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= gtn_The2014RevolvingCreditFacilityMember		             556,400,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= gtn_The2014RevolvingCreditFacilityMember		 556,400,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= gtn_The2014RevolvingCreditFacilityMember		    
Line of Credit Facility, Interest Rate at Period End 3.80%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_DebtInstrumentAxis
= gtn_The2014RevolvingCreditFacilityMember		             3.80%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_DebtInstrumentAxis
= gtn_The2014RevolvingCreditFacilityMember		 3.80%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_DebtInstrumentAxis
= gtn_The2014RevolvingCreditFacilityMember		    
2012 Senior Credit Facility [Member]                      
Note 3 - Long-term Debt (Details) [Line Items]                      
Long-term Line of Credit   159,000,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= gtn_SeniorCreditFacility2012Member		                  
Line of Credit Facility, Interest Rate at Period End   4.80%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_DebtInstrumentAxis
= gtn_SeniorCreditFacility2012Member		                  
Line of Credit Facility, Remaining Borrowing Capacity   30,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= gtn_SeniorCreditFacility2012Member		                  
Debt Issuance Cost     9,900,000us-gaap_DebtIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= gtn_SeniorCreditFacility2012Member		                
Gains (Losses) on Extinguishment of Debt (4,900,000)us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_DebtInstrumentAxis
= gtn_SeniorCreditFacility2012Member		   (8,100,000)us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_DebtInstrumentAxis
= gtn_SeniorCreditFacility2012Member		                
2020 Notes [Member]                      
Note 3 - Long-term Debt (Details) [Line Items]                      
Proceeds from Issuance of Long-term Debt   375,000,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= gtn_Notes2020Member		 300,000,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= gtn_Notes2020Member		                
Deferred Finance Costs, Net 11,300,000us-gaap_DeferredFinanceCostsNet
/ us-gaap_DebtInstrumentAxis
= gtn_Notes2020Member		 13,200,000us-gaap_DeferredFinanceCostsNet
/ us-gaap_DebtInstrumentAxis
= gtn_Notes2020Member		           11,300,000us-gaap_DeferredFinanceCostsNet
/ us-gaap_DebtInstrumentAxis
= gtn_Notes2020Member		 11,300,000us-gaap_DeferredFinanceCostsNet
/ us-gaap_DebtInstrumentAxis
= gtn_Notes2020Member		    
Debt Issuance Cost   7,300,000us-gaap_DebtIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= gtn_Notes2020Member		 7,300,000us-gaap_DebtIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= gtn_Notes2020Member		                
Unsecured Debt 675,000,000us-gaap_UnsecuredDebt
/ us-gaap_DebtInstrumentAxis
= gtn_Notes2020Member		 675,000,000us-gaap_UnsecuredDebt
/ us-gaap_DebtInstrumentAxis
= gtn_Notes2020Member		           675,000,000us-gaap_UnsecuredDebt
/ us-gaap_DebtInstrumentAxis
= gtn_Notes2020Member		 675,000,000us-gaap_UnsecuredDebt
/ us-gaap_DebtInstrumentAxis
= gtn_Notes2020Member		    
Debt Instrument, Interest Rate, Stated Percentage 7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= gtn_Notes2020Member		             7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= gtn_Notes2020Member		 7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= gtn_Notes2020Member		    
Debt Instrument, Interest Rate, Effective Percentage 7.30%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= gtn_Notes2020Member		             7.30%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= gtn_Notes2020Member		 7.30%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= gtn_Notes2020Member		    
Proceeds from Debt, Net of Issuance Costs     290,900,000us-gaap_ProceedsFromDebtNetOfIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= gtn_Notes2020Member		                
Excalibur Loan [Member]                      
Note 3 - Long-term Debt (Details) [Line Items]                      
Debt Instrument, Face Amount                     3,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= gtn_ExcaliburLoanMember
2015 Notes [Member]                      
Note 3 - Long-term Debt (Details) [Line Items]                      
Gains (Losses) on Extinguishment of Debt     (38,600,000)us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_DebtInstrumentAxis
= gtn_Notes2015Member		                
KXJB Acquisition [Member] | Excalibur [Member]                      
Note 3 - Long-term Debt (Details) [Line Items]                      
Repayments of Long-term Debt                   2,900,000us-gaap_RepaymentsOfLongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= gtn_KXJBAcquisitionMember
/ dei_LegalEntityAxis
= gtn_ExcaliburMember		  
KXJB Acquisition [Member]                      
Note 3 - Long-term Debt (Details) [Line Items]                      
Gains (Losses) on Extinguishment of Debt $ (200,000)us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_BusinessAcquisitionAxis
= gtn_KXJBAcquisitionMember