Impairment of Goodwill and Other Indefinite-Lived Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | 9 Months Ended | |
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Jun. 30, 2018 |
Jun. 30, 2017 |
Sep. 30, 2018 |
Sep. 30, 2017 |
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| Goodwill And Other Intangible Assets [Line Items] | ||||
| Percentage of intangible assets | 71.00% | |||
| Impairment of intangible assets, indefinite-lived (Excluding goodwill) | $ 19 | $ 0 | $ 19 | |
| Omaha Market Cluster [Member] | ||||
| Goodwill And Other Intangible Assets [Line Items] | ||||
| Percentage by which fair value exceeds carrying amount | 7.00% | |||
| Broadcast Licenses [Member] | ||||
| Goodwill And Other Intangible Assets [Line Items] | ||||
| Percentage of indefinite lived intangible assets | 93.00% | |||
| Goodwill and Mastheads [Member] | ||||
| Goodwill And Other Intangible Assets [Line Items] | ||||
| Percentage of indefinite lived intangible assets | 7.00% | |||
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- Definition Goodwill and other intangible assets. No definition available.
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- Definition Percentage by which fair value exceeds carrying amount. No definition available.
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- Definition Percentage of indefinite lived intangible assets. No definition available.
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- Definition It represents the percentage of intangible assets. No definition available.
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- Definition Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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