Quarterly report pursuant to Section 13 or 15(d)

Recent Transactions - Divestitures - Additional Information (Detail)

v3.21.2
Recent Transactions - Divestitures - Additional Information (Detail) - USD ($)
$ in Thousands
6 Months Ended
May 25, 2021
Mar. 18, 2021
Feb. 05, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]            
Proceeds from sale of productive assets       $ 3,627 $ 188  
Gain (loss) on disposition of assets       500    
Deferred income taxes $ 400     68,480   $ 68,883
Radio Stations [member]            
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]            
Proceeds from sale of productive assets   $ 3,500 $ 4,000 3,200    
Pretax loss on sale of assets   $ 1,400   400    
Radio Stations [member] | Maximum [Member]            
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]            
Pretax loss on sale of assets       $ 1,800    
Singing News Magazine And Singing News Radio [Member]            
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]            
Proceeds from sale of productive assets $ 100