The increase in the fair value of plan assets from contributions made by the employer.

No definition available.

Name:	gtn_DefinedContributionPlanContributionsByEmployer
Namespace Prefix:	gtn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

+ Details

Name:	gtn_Note5RetirementPlansDetailsLineItems
Namespace Prefix:	gtn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of the employer's best estimate of contributions expected to be paid to the plan in the current fiscal period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2709-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanExpectedContributionsInCurrentFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_DefinedContributionPlanNameAxis=gtn_CapitalAccumulationPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementScenarioAxis=gtn_First3PercentOfEachEmployeesSalaryDeferralMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementScenarioAxis=gtn_MatchedByTheCompanyAtTheRateOf100PercentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementScenarioAxis=gtn_Next2PercentOfEachEmployeesSalaryDeferralMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementScenarioAxis=gtn_MatchedByTheCompanyAtTheRateOf50PercentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 5 - Retirement Plans (Details) - USD ($) $ in Millions	6 Months Ended
Note 5 - Retirement Plans (Details) - USD ($) $ in Millions	Dec. 31, 2015	Jun. 30, 2015
Note 5 - Retirement Plans (Details) [Line Items]
Defined Contribution Plan, Contributions by Employer (in Dollars)		$ 1.4
Defined Benefit Plan, Expected Contributions in Current Fiscal Year (in Dollars)		3.8
Capital Accumulation Plan [Member]
Note 5 - Retirement Plans (Details) [Line Items]
Defined Benefit Plan, Expected Contributions in Current Fiscal Year (in Dollars)		$ 1.4
Capital Accumulation Plan [Member] \| Subsequent Event [Member] \| First 3% of Each Employee's Salary Deferral [Member]
Note 5 - Retirement Plans (Details) [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	100.00%
Capital Accumulation Plan [Member] \| Subsequent Event [Member] \| Matched by the Company at the Rate of 100% [Member]
Note 5 - Retirement Plans (Details) [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	3.00%
Capital Accumulation Plan [Member] \| Subsequent Event [Member] \| Next 2% of Each Employee's Salary Deferral [Member]
Note 5 - Retirement Plans (Details) [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	50.00%
Capital Accumulation Plan [Member] \| Subsequent Event [Member] \| Matched by the Company at the Rate of 50% [Member]
Note 5 - Retirement Plans (Details) [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	2.00%