Property and Equipment - Property and Equipment (Detail) - USD ($)
$ in Thousands |
12 Months Ended |
|
Dec. 31, 2016 |
Dec. 31, 2015 |
| Property, Plant and Equipment [Line Items] |
|
|
| Property and equipment excluding land gross |
$ 251,500
|
$ 248,000
|
| Less accumulated depreciation |
204,343
|
198,282
|
| Property and equipment excluding land, net |
47,200
|
49,700
|
| Land |
8,200
|
8,200
|
| Property and equipment, total |
55,368
|
57,874
|
| Buildings |
|
|
| Property, Plant and Equipment [Line Items] |
|
|
| Property and equipment excluding land gross |
$ 18,600
|
18,600
|
| Property and equipment, Estimated useful life |
39 years
|
|
| Construction in progress |
|
|
| Property, Plant and Equipment [Line Items] |
|
|
| Property and equipment excluding land gross |
$ 2,600
|
2,900
|
| Transmission, studio and other broadcast equipment |
|
|
| Property, Plant and Equipment [Line Items] |
|
|
| Property and equipment excluding land gross |
$ 166,900
|
163,300
|
| Transmission, studio and other broadcast equipment | Minimum |
|
|
| Property, Plant and Equipment [Line Items] |
|
|
| Property and equipment, Estimated useful life |
5 years
|
|
| Transmission, studio and other broadcast equipment | Maximum |
|
|
| Property, Plant and Equipment [Line Items] |
|
|
| Property and equipment, Estimated useful life |
15 years
|
|
| Office and computer equipment |
|
|
| Property, Plant and Equipment [Line Items] |
|
|
| Property and equipment excluding land gross |
$ 30,200
|
29,600
|
| Office and computer equipment | Minimum |
|
|
| Property, Plant and Equipment [Line Items] |
|
|
| Property and equipment, Estimated useful life |
3 years
|
|
| Office and computer equipment | Maximum |
|
|
| Property, Plant and Equipment [Line Items] |
|
|
| Property and equipment, Estimated useful life |
7 years
|
|
| Transportation equipment |
|
|
| Property, Plant and Equipment [Line Items] |
|
|
| Property and equipment excluding land gross |
$ 6,800
|
6,700
|
| Property and equipment, Estimated useful life |
5 years
|
|
| Leasehold improvements and land improvements |
|
|
| Property, Plant and Equipment [Line Items] |
|
|
| Property and equipment excluding land gross |
$ 26,400
|
$ 26,900
|
| Property and equipment, Estimated useful life |
Lesser of lease life or useful life
|
|