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Note 11 - Goodwill and Intangible Assets (Details) - Changes in Goodwill and Other Intangible Assets (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Note 11 - Goodwill and Intangible Assets (Details) - Changes in Goodwill and Other Intangible Assets [Line Items] |  |  |
Beginning Balance | $ 184,409 us-gaap_Goodwill | $ 170,522 us-gaap_Goodwill |
Additions | 189,981 us-gaap_GoodwillAcquiredDuringPeriod | 13,887 us-gaap_GoodwillAcquiredDuringPeriod |
Ending Balance | 374,390 us-gaap_Goodwill | 184,409 us-gaap_Goodwill | 170,522 us-gaap_Goodwill
Beginning Balance Broadcast licenses | 838,982 us-gaap_IndefiniteLivedLicenseAgreements |  |
Additions | 428,034 us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent | 36,024 us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent |
Ending Blance Broadcast licenses | 1,023,580 us-gaap_IndefiniteLivedLicenseAgreements | 838,982 us-gaap_IndefiniteLivedLicenseAgreements |
Beginning Balance Definite lived intangible assets | 2,644 us-gaap_FiniteLivedIntangibleAssetsNet |  |
Amortization | (8,297)us-gaap_AmortizationOfIntangibleAssets | (336)us-gaap_AmortizationOfIntangibleAssets | (75)us-gaap_AmortizationOfIntangibleAssets
Ending Balance Definite lived intangible assets | 47,802 us-gaap_FiniteLivedIntangibleAssetsNet | 2,644 us-gaap_FiniteLivedIntangibleAssetsNet |
Beginning Balance Intangible assets net of accumulated amortization | 1,026,035 us-gaap_IntangibleAssetsNetIncludingGoodwill | 990,347 us-gaap_IntangibleAssetsNetIncludingGoodwill |
Additions | 428,034 us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent | 36,024 us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent |
Amortization | (8,297)us-gaap_AmortizationOfIntangibleAssets | (336)us-gaap_AmortizationOfIntangibleAssets | (75)us-gaap_AmortizationOfIntangibleAssets
Ending Balance Intangible assets net of accumulated amortization | 1,445,772 us-gaap_IntangibleAssetsNetIncludingGoodwill | 1,026,035 us-gaap_IntangibleAssetsNetIncludingGoodwill | 990,347 us-gaap_IntangibleAssetsNetIncludingGoodwill
Broadcast Licenses [Member] |  |  |
Note 11 - Goodwill and Intangible Assets (Details) - Changes in Goodwill and Other Intangible Assets [Line Items] |  |  |
Beginning Balance Broadcast licenses | 838,982 us-gaap_IndefiniteLivedLicenseAgreements / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = gtn_BroadcastLicensesMember | 819,188 us-gaap_IndefiniteLivedLicenseAgreements / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = gtn_BroadcastLicensesMember |
Additions | 184,598 us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = gtn_BroadcastLicensesMember | 19,794 us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = gtn_BroadcastLicensesMember |
Ending Blance Broadcast licenses | 1,023,580 us-gaap_IndefiniteLivedLicenseAgreements / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = gtn_BroadcastLicensesMember | 838,982 us-gaap_IndefiniteLivedLicenseAgreements / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = gtn_BroadcastLicensesMember |
Additions | 184,598 us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = gtn_BroadcastLicensesMember | 19,794 us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = gtn_BroadcastLicensesMember |
Other Intangible Assets [Member] |  |  |
Note 11 - Goodwill and Intangible Assets (Details) - Changes in Goodwill and Other Intangible Assets [Line Items] |  |  |
Additions | 53,455 us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember | 2,343 us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |
Beginning Balance Definite lived intangible assets | 2,644 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember | 637 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |
Amortization | (8,297)us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember | (336)us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |
Ending Balance Definite lived intangible assets | 47,802 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember | 2,644 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |
Beginning Balance Intangible assets net of accumulated amortization | 2,644 us-gaap_IntangibleAssetsNetIncludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |  |
Additions | 53,455 us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember | 2,343 us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |
Amortization | (8,297)us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember | (336)us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |
Ending Balance Intangible assets net of accumulated amortization | $ 47,802 us-gaap_IntangibleAssetsNetIncludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember | $ 2,644 us-gaap_IntangibleAssetsNetIncludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + 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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- 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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- Definition The increase (decrease) during the reporting period in intangible assets (for example patents and licenses). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the capitalized costs to acquire rights under a license arrangement (for example, to sell specified products in a specified territory) having an indefinite period of benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Carrying amount of finite-lived intangible assets, indefinite-lived intangible assets and goodwill. Goodwill is an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Intangible assets are assets, not including financial assets, lacking physical substance. + References No definition available. + Details
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