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Note 3 - Acquisitions and Divestitures - Transaction Related Expenses (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($)
Transaction related expenses | $ 79
Broadcast Licenses [Member] |
Transaction related expenses | 45
Corporate and Administrative [Member] |
Transaction related expenses | 34
Legal, Consulting and Other Professional Fees [Member] |
Transaction related expenses | 24
Incentive Compensation and Severance Costs [Member] |
Transaction related expenses | 21
Termination of Sales Representation Agreements [Member] |
Transaction related expenses | $ 34

X
- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460 + Details
Name: | us-gaap_BusinessCombinationAcquisitionRelatedCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=gtn_BroadcastLicensesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=gtn_CorporateAndAdministrativeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_NatureOfExpenseAxis=gtn_LegalConsultingAndOtherProfessionalFeesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_NatureOfExpenseAxis=gtn_IncentiveCompensationAndSeveranceCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_NatureOfExpenseAxis=gtn_TerminationOfSalesRepresentationAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |