Annual report pursuant to Section 13 and 15(d)

Acquisitions and Recent Transactions - 2018 Acquisitions - Broadcast - Additional Information (Detail)

v3.19.1
Acquisitions and Recent Transactions - 2018 Acquisitions - Broadcast - Additional Information (Detail) - USD ($)
12 Months Ended
Sep. 11, 2018
Jul. 25, 2018
Jun. 25, 2018
Dec. 31, 2018
Dec. 31, 2017
Jan. 03, 2017
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]            
Business combination, consideration transferred       $ 11,180,000 $ 4,043,000  
Goodwill       $ 26,789,000 $ 26,424,000 $ 25,613,000
KDXE-FM [Member]            
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]            
Business combination, consideration transferred     $ 1,100,000      
Goodwill     $ 7,400      
KTRB-AM [Member]            
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]            
Payment for asset acquisition $ 5,100,000          
Transaction costs related to asset acquisition $ 200,000          
KZTS-AM [Member]            
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]            
Payment for asset acquisition   $ 200,000        
Transaction costs related to asset acquisition   $ 30,000