Quarterly report pursuant to Section 13 or 15(d)

Recent Transactions - Acquisitions - Additional Information (Detail)

v3.19.3
Recent Transactions - Acquisitions - Additional Information (Detail) - USD ($)
 9 Months Ended
Sep. 27, 2019
Sep. 09, 2019
Jul. 25, 2019
Jul. 10, 2019
Jun. 06, 2019
Mar. 18, 2019
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 03, 2017
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]                    
Goodwill             $ 26,425,000 $ 26,789,000 $ 26,424,000  
Business combination, liabilities arising from contingencies, amount recognized                   $ 500,000
KPAM-AM In Portland, Oregon Asset Acquisition [Member]                    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]                    
Asset purchase consideration transferred $ 1,000,000           $ 965,000      
Business acquisition, effective date of acquisition Sep. 27, 2019           Sep. 27, 2019      
FM Translator Construction Permit in Louisville, Kentucky Asset Acquisition [Member]                    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]                    
Asset purchase consideration transferred   $ 35,000         $ 35,000      
Business acquisition, effective date of acquisition   Sep. 09, 2019         Sep. 09, 2019      
Journey box media [Member]                    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]                    
Business acquisition, effective date of acquisition             Jul. 25, 2019      
Business Combination, Consideration Transferred     $ 500,000       $ 500,000      
Goodwill     $ 4,000              
Steelehouse production [Member]                    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]                    
Business acquisition, effective date of acquisition             Jul. 10, 2019      
Business Combination, Consideration Transferred       $ 100,000     $ 100,000      
Goodwill       $ 2,000            
Investment House.Com [Member]                    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]                    
Business acquisition, effective date of acquisition             Jun. 06, 2019      
Business Combination, Consideration Transferred         $ 600,000   $ 553,000      
Additional incentive payment         10.00%          
Business combination, liabilities arising from contingencies, amount recognized             2,500      
Pjmedia.com website [Member]                    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]                    
Asset purchase consideration transferred           $ 100,000 $ 100,000      
Business acquisition, effective date of acquisition             Mar. 18, 2019