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FCC Broadcasting Licenses - Carrying Amount of Broadcasting Licenses (Detail) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Nov. 01, 2016
FCC Broadcasting Licenses [Line Items]      
Beginning Balance $ 228,554,165    
Ending Balance 476,571,140 $ 228,554,165  
FCC Broadcasting License [Member]      
FCC Broadcasting Licenses [Line Items]      
Beginning Balance 228,554,165 234,328,330  
Assets held for sale reclassification   (6,165,340)  
Beneficial interest in trust reclassification (15,738,300)    
Ending Balance 476,571,140 228,554,165  
Translator Licenses [Member] | FCC Broadcasting License [Member]      
FCC Broadcasting Licenses [Line Items]      
Assets acquisitions 495,075 $ 391,175  
Greater Media Inc [Member]      
FCC Broadcasting Licenses [Line Items]      
Assets acquisitions     $ 263,260,200
Greater Media Inc [Member] | FCC Broadcasting License [Member]      
FCC Broadcasting Licenses [Line Items]      
Assets acquisitions $ 263,260,200