Goodwill and Other Intangible Assets - Carrying Amount of Goodwill (Detail) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Goodwill [Line Items] | |||
| Goodwill | $ 50,081,000 | $ 50,081,000 | $ 50,081,000 |
| Television | |||
| Goodwill [Line Items] | |||
| Goodwill | 35,912,000 | 35,912,000 | 35,912,000 |
| Impairment | 0 | 0 | 0 |
| Radio | |||
| Goodwill [Line Items] | |||
| Impairment | (700,000) | ||
| Digital | |||
| Goodwill [Line Items] | |||
| Goodwill | 14,169,000 | 14,169,000 | $ 14,169,000 |
| Impairment | $ 0 | $ 0 | |