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FCC Broadcasting Licenses - Additional Information (Detail) |  |  |  |  | 12 Months Ended
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Jun. 25, 2015 USD ($) License | Feb. 27, 2015 USD ($) License | May. 01, 2014 USD ($) License | Feb. 14, 2014 USD ($) License | Dec. 31, 2015
FCC Broadcasting Licenses [Line Items] |  |  |  |  |
Translator licenses renewable term |  |  |  |  | 8 years
Reach Communications, Inc. [Member] |  |  |  |  |
FCC Broadcasting Licenses [Line Items] |  |  |  |  |
Acquisition of translator licenses | $ |  | $ 200,000 |  |  |
Number of translator licenses acquired | License |  | 1 |  |  |
University of Northwestern [Member] |  |  |  |  |
FCC Broadcasting Licenses [Line Items] |  |  |  |  |
Acquisition of translator licenses | $ | $ 200,000 |  |  |  |
Number of translator licenses acquired | License | 2 |  |  |  |
CTC Media Group [Member] |  |  |  |  |
FCC Broadcasting Licenses [Line Items] |  |  |  |  |
Acquisition of translator licenses | $ |  |  |  | $ 65,000 |
Number of translator licenses acquired | License |  |  |  | 1 |
Starboard Media Foundation, Inc. [Member] |  |  |  |  |
FCC Broadcasting Licenses [Line Items] |  |  |  |  |
Acquisition of translator licenses | $ |  |  |  | $ 15,000 |
Number of translator licenses acquired | License |  |  |  | 1 |
Eastern Airwaves, LLC [Member] |  |  |  |  |
FCC Broadcasting Licenses [Line Items] |  |  |  |  |
Acquisition of translator licenses | $ |  |  | $ 75,000 |  |
Number of translator licenses acquired | License |  |  | 1 |  |

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