Quarterly report pursuant to Section 13 or 15(d)

Broadcast Licenses - Schedule of Changes in Broadcasting Licenses (Detail)

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Broadcast Licenses - Schedule of Changes in Broadcasting Licenses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Indefinite-lived Intangible Assets [Line Items]    
Balance, beginning of period before cumulative loss on impairment $ 434,444 $ 434,209
Accumulated loss on impairment, Beginning Balance (114,436) (114,436)
Balance, beginning of period after cumulative loss on impairment 320,008 319,773
Balance, end of period before cumulative loss on impairment 434,634 434,444
Accumulated loss on impairment, Ending Balance (114,436) (114,436)
Balance, end of period after cumulative loss on impairment 320,198 320,008
Radio Stations [Member]    
Indefinite-lived Intangible Assets [Line Items]    
Acquisitions of radio stations $ 190 $ 235