Percentage of change in fair value of assets.

No definition available.

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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.

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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.

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- Definition

Description of how the fair value of the impaired goodwill of the reporting unit was determined for goodwill valuation purposes.

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- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

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Goodwill and Other Intangible Assets - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018 USD ($) Segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Oct. 01, 2018 USD ($)
Goodwill [Line Items]
Aggregate amortization expense	$ 6,100,000	$ 5,900,000	$ 3,500,000
Number of reporting segments \| Segment	3
Goodwill	$ 74,292,000	70,729,000	50,081,000
FCC
Goodwill [Line Items]
Impairment of goodwill	0	0
Television
Goodwill [Line Items]
Goodwill	$ 40,549,000	40,549,000	35,912,000	$ 40,500,000
Goodwill, impaired, method for fair value determination	the television reporting unit fair value exceeded its carrying value by 48%, resulting in no impairment charge in 2018. The discount rate used in the fair value calculation of the television reporting unit was increased from prior year and expected cash flows of a component of the reporting unit were decreased from prior year to account for risk within the forecasts of the reporting unit. If that discount rate were to increase by 1%, the fair value of the television reporting unit would decrease by 6%. If the long term projected growth rate were to decrease by 0.5%, the fair value of the television reporting unit would decrease by 1%.
Percentage of fair value of assets	48.00%
Impairment of goodwill	$ 0
Digital Media
Goodwill [Line Items]
Goodwill	$ 33,743,000	30,180,000	$ 14,169,000	$ 33,700,000
Goodwill, impaired, method for fair value determination	the digital reporting unit fair value exceeded its carrying value by 1%, resulting in no impairment charge in 2018. The discount rate used in the fair value calculation of the digital reporting unit was increased from prior year and expected cash flows of a component of the reporting unit were decreased from prior year to account for risk within the forecasts of the reporting unit. If that discount rate were to increase by 1%, the fair value of the digital reporting unit would decrease by 5%. If the long term projected growth rate were to decrease by 0.5%, the fair value of the digital reporting unit would decrease by 1%.
Percentage of fair value of assets	1.00%
Impairment of goodwill	$ 0
Radio
Goodwill [Line Items]
Goodwill	$ 0	$ 0