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Note 11 - Goodwill and Intangible Assets (Details) - Summary of Changes in Goodwill (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Summary of Changes in Goodwill [Abstract] |  |  |
Goodwill, gross | $ 472,986 us-gaap_GoodwillGross | $ 283,005 us-gaap_GoodwillGross | $ 269,118 us-gaap_GoodwillGross
Goodwill, gross | 189,981 gtn_GoodwillAcquiredDuringPeriodGross | 13,887 gtn_GoodwillAcquiredDuringPeriodGross |
Accumulated goodwill impairment | (98,596)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss | (98,596)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss | (98,596)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Goodwill, net | 374,390 us-gaap_Goodwill | 184,409 us-gaap_Goodwill | 170,522 us-gaap_Goodwill
Goodwill, net | $ 189,981 us-gaap_GoodwillAcquiredDuringPeriod | $ 13,887 us-gaap_GoodwillAcquiredDuringPeriod |

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- Definition The amount of gross goodwill that was acquired during the period. + References No definition available. + Details
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Namespace Prefix: | gtn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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X
- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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X
- Definition Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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X
- Definition Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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