Quarterly report pursuant to Section 13 or 15(d)

Recent Transactions - Debt Transactions - Additional Information (Detail)

v3.21.1
Recent Transactions - Debt Transactions - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 18, 2021
Feb. 04, 2021
Feb. 05, 2020
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]            
Long-term Debt, Gross       $ 225,143   $ 218,764
Proceeds from Sale of Productive Assets       3,501 $ 2  
Debt Instrument, Face Amount       216,300    
Local Marketing Agreement [member]            
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]            
Debt Instrument, Face Amount       $ 300    
Debt Instrument, Maturity Date, Description       one year    
Small Business Association [member]            
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]            
Long-term Debt, Gross       $ 11,200    
Debt Instrument, Interest Rate, Stated Percentage       1.00%    
Debt Instrument, Maturity Date, Description       five years    
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    
KDIAAM and KDYAAM [member]            
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]            
Payments to Acquire Productive Assets   $ 600