Annual report pursuant to Section 13 and 15(d)

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

v3.20.1
Broadcast Licenses - Schedule of Changes in Broadcasting Licenses (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Indefinite-lived Intangible Assets [Line Items]    
Balance, beginning of period before cumulative loss on impairment $ 484,691 $ 486,455
Accumulated loss on impairment, Beginning Balance (108,375) (105,541)
Balance, beginning of period after cumulative loss on impairment 376,316 380,914
Abandoned capital projects   (40)
Impairments based on the estimated fair value of broadcast licenses (2,908) (2,834)
Balance, end of period before cumulative loss on impairment 441,143 484,691
Accumulated loss on impairment, Ending Balance (103,285) (108,375)
Balance, end of period after cumulative loss on impairment 337,858 376,316
Radio Stations [Member]    
Indefinite-lived Intangible Assets [Line Items]    
Acquisitions of FM translators and construction permits 617 6,270
Disposition of radio stations (36,502) (8,013)
FM Translators [Member]    
Indefinite-lived Intangible Assets [Line Items]    
Acquisitions of FM translators and construction permits 35 $ 19
Capital Projects [Member]    
Indefinite-lived Intangible Assets [Line Items]    
Acquisitions of FM translators and construction permits $ 300