Goodwill and Other Intangible Assets - Additional Information (Detail) |
12 Months Ended | |||
|---|---|---|---|---|
|
Jun. 30, 2014
Segment
|
Dec. 31, 2016
USD ($)
Segment
|
Dec. 31, 2015
USD ($)
|
Dec. 31, 2014
USD ($)
|
|
| Goodwill [Line Items] | ||||
| Aggregate amortization expense | $ 3,500,000 | $ 3,500,000 | $ 3,000,000 | |
| Number of reporting segments | Segment | 2 | 3 | ||
| Television | ||||
| Goodwill [Line Items] | ||||
| Impairment of goodwill | $ 0 | 0 | 0 | |
| Digital | ||||
| Goodwill [Line Items] | ||||
| Impairment of goodwill | $ 0 | $ 0 | ||
| Radio | ||||
| Goodwill [Line Items] | ||||
| Impairment of goodwill | $ 700,000 | |||