Acquisitions - Changes in Carrying Amount of Goodwill (Detail) $ in Thousands	9 Months Ended
Sep. 30, 2018 USD ($)
Business Acquisition [Line Items]
Goodwill, Beginning balance	$ 70,557
Goodwill, Acquisition	3,592
Goodwill, Ending balance	74,149
Television
Business Acquisition [Line Items]
Goodwill, Beginning balance	40,549
Goodwill, Ending balance	40,549
Digital
Business Acquisition [Line Items]
Goodwill, Beginning balance	30,008
Goodwill, Acquisition	3,592
Goodwill, Ending balance	$ 33,600

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.

No definition available.

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

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