Goodwill and Other Intangible Assets - Composition of Company's Acquired Intangible Assets and Associated Accumulated Amortization (Detail) - USD ($)
$ in Thousands |
12 Months Ended |
|
Dec. 31, 2016 |
Dec. 31, 2015 |
| Schedule Of Intangible Assets [Line Items] |
|
|
| Gross Carrying Amount |
$ 94,890
|
$ 94,890
|
| Accumulated Amortization |
81,770
|
78,234
|
| Net Carrying Amount |
13,120
|
16,656
|
| Intangible assets not subject to amortization: |
|
|
| Total intangible assets |
233,821
|
237,357
|
| FCC |
|
|
| Intangible assets not subject to amortization: |
|
|
| Licenses |
$ 220,701
|
220,701
|
| Television network affiliation agreements |
|
|
| Schedule Of Intangible Assets [Line Items] |
|
|
| Weighted average remaining life in years |
5 years
|
|
| Gross Carrying Amount |
$ 65,089
|
65,089
|
| Accumulated Amortization |
53,492
|
51,172
|
| Net Carrying Amount |
$ 11,597
|
13,917
|
| Customer base |
|
|
| Schedule Of Intangible Assets [Line Items] |
|
|
| Weighted average remaining life in years |
1 year
|
|
| Gross Carrying Amount |
$ 3,146
|
3,146
|
| Accumulated Amortization |
2,664
|
1,789
|
| Net Carrying Amount |
$ 482
|
1,357
|
| Other |
|
|
| Schedule Of Intangible Assets [Line Items] |
|
|
| Weighted average remaining life in years |
14 years
|
|
| Gross Carrying Amount |
$ 26,655
|
26,655
|
| Accumulated Amortization |
25,614
|
25,273
|
| Net Carrying Amount |
$ 1,041
|
$ 1,382
|