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Note 1 - Basis of Presentation - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Increase in pension liability	$ (35)	$ (35)
Income tax benefit	(9)	(14)
Accumulated other comprehensive loss	$ (26)	$ (21)

X

- Definition

The before tax amount of additional minimum pension liability not yet recognized as a net periodic pension cost.

+ References

No definition available.

+ Details

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Namespace Prefix:	gtn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Pension and other postretirement benefit plans accumulated other comprehensive income loss minimum pension liability tax.

+ References

No definition available.

+ Details

Name:	gtn_PensionAndOtherPostretirementBenefitPlansAccumulatedOtherComprehensiveIncomeLossMinimumPensionLiabilityTax
Namespace Prefix:	gtn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e681-108580

+ Details

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