Number of stations owned.

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- Definition

Percentage of revenue generated from foreign countries.

+ References

No definition available.

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- Definition

Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

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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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- 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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Segment Information - Additional Information (Detail)	3 Months Ended		9 Months Ended
Segment Information - Additional Information (Detail)	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017 Segment Station	Sep. 30, 2016	Apr. 04, 2017
Segment Reporting Information [Line Items]
Number of reportable segments \| Segment			3
Percentage of revenue generated from outside the United States	3.00%	0.00%	5.00%	0.00%
Headway
Segment Reporting Information [Line Items]
Business acquisition date			Apr. 04, 2017
Ownership Interest acquired					100.00%
Television
Segment Reporting Information [Line Items]
Number of stations owned			55
Radio
Segment Reporting Information [Line Items]
Number of stations owned			49
Advertisements and Syndicates Radio Programming \| Minimum
Segment Reporting Information [Line Items]
Number of stations owned			300