Annual report pursuant to Section 13 and 15(d)

Recent Transactions - Pending Transactions -Additional Information (Detail)

v3.22.0.1
Recent Transactions - Pending Transactions -Additional Information (Detail)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 06, 2021
USD ($)
Aug. 31, 2021
USD ($)
Jun. 02, 2021
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Nov. 18, 2021
USD ($)
a
Jul. 07, 2021
USD ($)
Radio StationWLCCAMand FM translator [Member]              
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]              
Payable for asset acquistion $ 0.6            
Escrow Deposits Related to Property Sales $ 0.1            
Denver [Member] | Agreement Sell Nine Point Three Acres Of Land [Member]              
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]              
Proceeds from sale of real estate   $ 8.2          
Land [Member] | Phoenix Arizona [Member]              
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]              
Assets held for sale           $ 2.0  
Area of land | a           4.5  
Radio Stations [Member]              
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]              
Pretax loss on sale of assets       $ 1.4 $ 0.4    
Radio Stations [Member] | Maximum [Member]              
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]              
Pretax loss on sale of assets         $ 1.8    
Radio Station KKOL In Seattle [Member]              
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]              
Escrow Deposit             $ 0.1
Proceeds from sale of real estate     $ 0.5