Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.1
Broadcast Licenses - Schedule of Changes in Broadcasting Licenses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 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   (2,834)
Balance, end of period before cumulative loss on impairment 480,400 484,691
Accumulated loss on impairment, Ending Balance (108,375) (108,375)
Balance, end of period after cumulative loss on impairment 372,025 376,316
Radio Stations [Member]    
Indefinite-lived Intangible Assets [Line Items]    
Acquisitions of FM translators and construction permits   6,270
Dispositions of radio stations $ (4,291) (8,013)
FM Translators [Member]    
Indefinite-lived Intangible Assets [Line Items]    
Acquisitions of FM translators and construction permits   $ 19